Android代码示例

• Android代码示例
  • OptionsMenu
  • ImageButton
  • CheckBox & RadioButton
  • Context Menu快捷菜单
  • Key Event
  • ListView Demo
  • Sub menu 子菜单
  • Activity Communication
  • BroadcastReceiverDemo
  • Intent Demo
  • IntentResolutionDemo
  • AIDL
  • AIDL: RemoteMathCallerDemoActivity
  • ContentProvider Demo
  • ContentResolverDemo
  • SQLite Demo

OptionsMenu

@Override    public boolean onCreateOptionsMenu(Menu menu) {        MenuInflater inflater = getMenuInflater();        inflater.inflate(R.menu.main_menu, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        TextView label = (TextView)findViewById(R.id.label);                switch (item.getItemId()) {        case R.id.main_menu_0:        label.setText("打印，菜单ID：" + item.getItemId());            return true;        case R.id.main_menu_1:        label.setText("新建，菜单ID：" + item.getItemId());            return true;        case R.id.main_menu_2:        label.setText("邮件，菜单ID：" + item.getItemId());            return true;        case R.id.main_menu_3:        label.setText("设置，菜单ID：" + item.getItemId());            return true;        case R.id.main_menu_4:        label.setText("订阅，菜单ID：" + item.getItemId());            return true;        default:            return false;        }    }

全体文件：

public class OptionMenu2Activity extends Activity {final static int MENU_00 = Menu.FIRST;final static int MENU_01 = Menu.FIRST+1;final static int MENU_02 = Menu.FIRST+2;final static int MENU_03 = Menu.FIRST+3;final static int MENU_04 = Menu.FIRST+4;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }        @Override    public boolean onCreateOptionsMenu(Menu menu) {    menu.add(0,MENU_00,0,"打印").setIcon(R.drawable.pic0);    menu.add(0,MENU_01,1,"新建").setIcon(R.drawable.pic1);    menu.add(0,MENU_02,2,"邮件").setIcon(R.drawable.pic2);    menu.add(0,MENU_03,3,"设置").setIcon(R.drawable.pic3);    menu.add(0,MENU_04,4,"订阅").setIcon(R.drawable.pic4);        return true;    }        @Override    public boolean onOptionsItemSelected(MenuItem item) {        TextView label = (TextView)findViewById(R.id.label);                switch (item.getItemId()) {        case MENU_00:        label.setText("打印，菜单ID：" + item.getItemId());            return true;        case MENU_01:        label.setText("新建，菜单ID：" + item.getItemId());            return true;        case MENU_02:        label.setText("邮件，菜单ID：" + item.getItemId());            return true;        case MENU_03:        label.setText("设置，菜单ID：" + item.getItemId());            return true;        case MENU_04:        label.setText("订阅，菜单ID：" + item.getItemId());            return true;        default:            return false;        }    }}

ImageButton

imageButton.setImageResource(R.drawable.download);imageButton.setOnClickListener(new View.OnClickListener() {    public void onClick(View view) {    textView.setText("ImageButtonTest");   }});

CheckBox & RadioButton

• checkBox

        final CheckBox checkBox1= (CheckBox)findViewById(R.id.CheckBox01);        final CheckBox checkBox2= (CheckBox)findViewById(R.id.CheckBox02);          CheckBox.OnClickListener checkboxListener = new CheckBox.OnClickListener(){@Overridepublic void onClick(View v) {switch(v.getId()){case R.id.CheckBox01:textView.setText("CheckBox01, isChecked:"+String.valueOf(checkBox1.isChecked()));return;case R.id.CheckBox02:textView.setText("CheckBox02, isChecked:"+String.valueOf(checkBox2.isChecked()));return;}}};  checkBox1.setOnClickListener(checkboxListener);checkBox2.setOnClickListener(checkboxListener);

• RadioButton

        final RadioButton radioButton1 = (RadioButton)findViewById(R.id.RadioButton01);        final RadioButton radioButton2 = (RadioButton)findViewById(R.id.RadioButton02);        RadioButton.OnClickListener radioButtonListener = new RadioButton.OnClickListener(){@Overridepublic void onClick(View v) {switch(v.getId()){case R.id.RadioButton01:textView.setText("RadioButton1 is selected");return;case R.id.RadioButton02:textView.setText("RadioButton2 is selected");;return;}}};  radioButton1.setOnClickListener(radioButtonListener);radioButton2.setOnClickListener(radioButtonListener);

Context Menu快捷菜单

public class ContextMenuActivity extends Activity {    /** Called when the activity is first created. */final static int CONTEXT_MENU_1 = Menu.FIRST;final static int CONTEXT_MENU_2 = Menu.FIRST+1;final static int CONTEXT_MENU_3 = Menu.FIRST+2;TextView LabelView = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        LabelView = (TextView)findViewById(R.id.label);        LabelView.setText(Html.fromHtml("红色其它颜色"));        registerForContextMenu(LabelView);    }        @Override    public void onCreateContextMenu(ContextMenu menu,     View v, ContextMenuInfo menuInfo){    menu.setHeaderTitle("快捷菜单标题");    menu.add(0, CONTEXT_MENU_1, 0,"菜单子项1");    menu.add(0, CONTEXT_MENU_2, 1,"菜单子项2");    menu.add(0, CONTEXT_MENU_3, 2,"菜单子项3");    }        @Override    public boolean onContextItemSelected(MenuItem item){    switch(item.getItemId()){    case CONTEXT_MENU_1:    LabelView.setText("菜单子项1");    return true;    case CONTEXT_MENU_2:    LabelView.setText("菜单子项2");    return true;    case CONTEXT_MENU_3:    LabelView.setText("菜单子项3");    return true;    }    return false;    }   }

Key Event

public class KeyEventDemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                EditText entryText = (EditText)findViewById(R.id.entry);        final CheckBox checkBox = (CheckBox)findViewById(R.id.block);        final TextView labelView = (TextView)findViewById(R.id.label);        entryText.setOnKeyListener(new OnKeyListener(){@Overridepublic boolean onKey(View view, int keyCode, KeyEvent keyEvent) {int metaState = keyEvent.getMetaState();int unicodeChar = keyEvent.getUnicodeChar();String msg = "";msg +="按键动作:" + String.valueOf(keyEvent.getAction())+"\n";msg +="按键代码:" + String.valueOf(keyCode)+"\n";msg +="按键字符:" + (char)unicodeChar+"\n";msg +="UNICODE:" + String.valueOf(unicodeChar)+"\n";msg +="重复次数:" + String.valueOf(keyEvent.getRepeatCount())+"\n";msg +="功能键状态:" + String.valueOf(metaState)+"\n";msg +="硬件编码:" + String.valueOf(keyEvent.getScanCode())+"\n";msg +="按键标志:" + String.valueOf(keyEvent.getFlags())+"\n";labelView.setText(msg);if (checkBox.isChecked())return true;elsereturn false;}              });      }}

ListView Demo

public class ListViewDemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                final TextView textView = (TextView)findViewById(R.id.TextView01);        ListView listView = (ListView)findViewById(R.id.ListView01);                List list  = new ArrayList();        list .add("ListView子项1");        list .add("ListView子项2");        list .add("ListView子项3");                ArrayAdapter adapter = new ArrayAdapter(this,         android.R.layout.simple_list_item_1, list );        listView.setAdapter(adapter);AdapterView.OnItemClickListener listViewListener = new AdapterView.OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { String msg = "父View："+arg0.toString()+"\n"+"子View："+arg1.toString()+"\n"+"位置："+String.valueOf(arg2)+"，ID："+String.valueOf(arg3);textView.setText(msg);}};listView.setOnItemClickListener(listViewListener);    }}

Sub menu 子菜单

package edu.hrbeu.SubMenu2;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.widget.TextView;public class SubMenu2Activity extends Activity {final static int MENU_00 = Menu.FIRST;final static int MENU_01 = Menu.FIRST+1;final static int SUB_MENU_00_01 = Menu.FIRST+2;final static int SUB_MENU_01_00 = Menu.FIRST+3;final static int SUB_MENU_01_01 = Menu.FIRST+4;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }        @Override    public boolean onCreateOptionsMenu(Menu menu) {       SubMenu sub1 = (SubMenu) menu.addSubMenu(0,MENU_00,0,"设置").setHeaderIcon(R.drawable.pic3);sub1.add(0,SUB_MENU_00_01 ,0,"打印").setIcon(R.drawable.pic0);SubMenu sub2 = (SubMenu) menu.addSubMenu(0,MENU_01,1,"新建").setHeaderIcon(R.drawable.pic1);sub2.add(0,SUB_MENU_01_00 ,0,"邮件").setIcon(R.drawable.pic2);sub2.add(0,SUB_MENU_01_01 ,0,"订阅").setIcon(R.drawable.pic4);        return true;    }        @Override    public boolean onOptionsItemSelected(MenuItem item) {        TextView label = (TextView)findViewById(R.id.label);                switch (item.getItemId()) {        case MENU_00:        label.setText("设置，菜单ID：" + item.getItemId());            return true;        case MENU_01:        label.setText("新建，菜单ID：" + item.getItemId());            return true;        case SUB_MENU_00_01:        label.setText("打印，子菜单ID：" + item.getItemId());            return true;        case SUB_MENU_01_00:        label.setText("邮件，子菜单ID：" + item.getItemId());            return true;        case SUB_MENU_01_01:        label.setText("订阅，子菜单ID：" + item.getItemId());            return true;        default:            return false;        }    }}

Activity Communication

ActivityCommunication.java

package edu.hrbeu.ActivityCommunication;import android.app.Activity;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class ActivityCommunicationActivity extends Activity {private static final int SUBACTIVITY1 = 1;private static final int SUBACTIVITY2 = 2;TextView textView;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                textView = (TextView)findViewById(R.id.textShow);        final Button btn1 = (Button)findViewById(R.id.btn1);        final Button btn2 = (Button)findViewById(R.id.btn2);                btn1.setOnClickListener(new OnClickListener(){        public void onClick(View view){        Intent intent = new Intent(ActivityCommunicationActivity.this, SubActivity1.class);                startActivityForResult(intent, SUBACTIVITY1);        }        });                btn2.setOnClickListener(new OnClickListener(){        public void onClick(View view){        Intent intent = new Intent(ActivityCommunicationActivity.this, SubActivity2.class);                startActivityForResult(intent, SUBACTIVITY2);        }        });    }@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);switch(requestCode){case SUBACTIVITY1:if (resultCode == RESULT_OK){Uri uriData = data.getData();textView.setText(uriData.toString());}break;case SUBACTIVITY2:break;}}}

SubActivity1.java

package edu.hrbeu.ActivityCommunication;import android.app.Activity;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class SubActivity1 extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.subactivity1);                final EditText editText = (EditText)findViewById(R.id.edit);        Button btnOK = (Button)findViewById(R.id.btn_ok);        Button btnCancel = (Button)findViewById(R.id.btn_cancel);                btnOK.setOnClickListener(new OnClickListener(){        public void onClick(View view){        String uriString = editText.getText().toString();        Uri data = Uri.parse(uriString);                Intent result = new Intent(null, data);                setResult(RESULT_OK, result);        finish();        }        });                btnCancel.setOnClickListener(new OnClickListener(){        public void onClick(View view){        setResult(RESULT_CANCELED, null);        finish();        }        });    }}

SubActivity2.java

package edu.hrbeu.ActivityCommunication;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class SubActivity2 extends Activity { /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.subactivity2);                Button btnReturn = (Button)findViewById(R.id.btn_return);                btnReturn.setOnClickListener(new OnClickListener(){        public void onClick(View view){        setResult(RESULT_CANCELED, null);        finish();        }        });    }}

BroadcastReceiverDemo

BroadcastReceiverDemoActivity.java

package edu.hrbeu.BroadcastReceiverDemo;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class BroadcastReceiverDemoActivity extends Activity {private EditText entryText ;private Button button;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        entryText = (EditText)findViewById(R.id.entry);        button = (Button)findViewById(R.id.btn);                button.setOnClickListener(new OnClickListener(){        public void onClick(View view){        Intent intent = new Intent("HELLO");        intent.putExtra("message", entryText.getText().toString());        sendBroadcast(intent);        }        });    }}

MyBroadcastReceiver.java

package edu.hrbeu.BroadcastReceiverDemo;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;public class MyBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {String msg = intent.getStringExtra("message");Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();}}

Intent Demo

IntentDemoActivity.java

package edu.hrbeu.IntentDemo;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class IntentDemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                Button button = (Button)findViewById(R.id.btn);        button.setOnClickListener(new OnClickListener(){        public void onClick(View view){        Intent intent = new Intent(IntentDemoActivity.this, NewActivity.class);                startActivity(intent);        }        });           }}

NewActivity.java

package edu.hrbeu.IntentDemo;import android.app.Activity;import android.os.Bundle;public class NewActivity extends Activity {/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main_2);    }}

IntentResolutionDemo

IntentResutionDemoActivity.java

package edu.hrbeu.IntentResolutionDemo;import android.app.Activity;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class IntentResolutionDemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                Button button = (Button)findViewById(R.id.btn);        button.setOnClickListener(new OnClickListener(){        public void onClick(View view){        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("schemodemo://edu.hrbeu/path"));        startActivity(intent);        }        });    }}

NewActivity.java

package edu.hrbeu.IntentResolutionDemo;import android.app.Activity;import android.os.Bundle;public class NewActivity extends Activity {/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main_2);    }}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>                                                                                                                                                                                                

AIDL

a.aidl

package ImplicityRandomServiceDemo;interface a{long add(long b1,long b2);}

ImplicityRandomServiceDemoActivity.java

package edu.hrbeu.ImplicityRandomServiceDemo;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class ImplicityRandomServiceDemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                Button startButton = (Button)findViewById(R.id.start);        Button stopButton = (Button)findViewById(R.id.stop);                final Intent serviceIntent = new Intent();        serviceIntent.setAction("hh1");                                                   startButton.setOnClickListener(new Button.OnClickListener(){        public void onClick(View view){        startService(serviceIntent);        }        });                stopButton.setOnClickListener(new Button.OnClickListener(){        public void onClick(View view){        stopService(serviceIntent);        }        });    }}

RandomService.java

package edu.hrbeu.ImplicityRandomServiceDemo;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.widget.Toast;public class RandomService extends Service{@Overridepublic void onCreate() {    super.onCreate();    Toast.makeText(this, "(1) 调用onCreate()",     Toast.LENGTH_LONG).show();    }@Overridepublic void onStart(Intent intent, int startId) {      super.onStart(intent, startId);      Toast.makeText(this, "(2) 调用onStart()",       Toast.LENGTH_SHORT).show();      double randomDouble = Math.random();      String msg = "随机数："+ String.valueOf(randomDouble);      Toast.makeText(this,msg, Toast.LENGTH_SHORT).show();      }@Overridepublic void onDestroy() {     super.onDestroy();     Toast.makeText(this, "(3) 调用onDestroy()",      Toast.LENGTH_SHORT).show();     } @Overridepublic IBinder onBind(Intent intent) {return null;}}

AIDL: RemoteMathCallerDemoActivity

RemoteMathCallerDemoActivity.java

package edu.hrbeu.RemoteMathCallerDemo;import edu.hrbeu.RemoteMathServiceDemo.IMathService;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.os.RemoteException;import android.view.View;import android.widget.Button;import android.widget.TextView;public class RemoteMathCallerDemoActivity extends Activity {private IMathService mathService;    private ServiceConnection mConnection = new ServiceConnection() {                           @Overridepublic void onServiceConnected(ComponentName name, IBinder service) {mathService = IMathService.Stub.asInterface(service);                          }@Overridepublic void onServiceDisconnected(ComponentName name) {mathService = null; }     };     private boolean isBound = false;TextView labelView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                labelView = (TextView)findViewById(R.id.label);        Button bindButton = (Button)findViewById(R.id.bind);        Button unbindButton = (Button)findViewById(R.id.unbind);        Button computButton = (Button)findViewById(R.id.compute_add);                bindButton.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {if(!isBound){final Intent serviceIntent = new Intent();serviceIntent.setAction("edu.hrbeu.RemoteMathServiceDemo.MathService");bindService(serviceIntent,mConnection,Context.BIND_AUTO_CREATE);isBound = true;}}          });                 unbindButton.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {if(isBound){isBound = false;unbindService(mConnection);mathService = null;}}            });                computButton.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {if (mathService == null){labelView.setText("δ��Զ�̷���");return;}long a = Math.round(Math.random()*100);long b = Math.round(Math.random()*100);long result = 0;try {result = mathService.Add(a, b);} catch (RemoteException e) {e.printStackTrace();}String msg = String.valueOf(a)+" + "+String.valueOf(b)+" = "+String.valueOf(result);labelView.setText(msg);}         });    } }

IMathService.aidl

package edu.hrbeu.RemoteMathServiceDemo;   interface IMathService {            long Add(long a, long b);           } 

xml:

<?xml version="1.0" encoding="utf-8"?>                                                                                    

ContentProvider Demo

contentProvider.java

package edu.hrbeu.ContentProviderDemo;import android.content.ContentProvider;import android.content.ContentUris;import android.content.ContentValues;import android.content.Context;import android.content.UriMatcher;import android.database.Cursor;import android.database.SQLException;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import android.database.sqlite.SQLiteQueryBuilder;import android.database.sqlite.SQLiteDatabase.CursorFactory;import android.net.Uri;public class PeopleProvider extends ContentProvider{private static final String DB_NAME = "people.db";private static final String DB_TABLE = "peopleinfo";private static final int DB_VERSION = 1;private SQLiteDatabase db;private DBOpenHelper dbOpenHelper;private static final int MULTIPLE_PEOPLE = 1;private static final int SINGLE_PEOPLE = 2;private static final UriMatcher uriMatcher;static { uriMatcher = new UriMatcher(UriMatcher.NO_MATCH); uriMatcher.addURI(People.AUTHORITY, People.PATH_MULTIPLE, MULTIPLE_PEOPLE); uriMatcher.addURI(People.AUTHORITY, People.PATH_SINGLE, SINGLE_PEOPLE);}@Overridepublic String getType(Uri uri) {switch(uriMatcher.match(uri)){case MULTIPLE_PEOPLE:return People.MINE_TYPE_MULTIPLE;case SINGLE_PEOPLE:return People.MINE_TYPE_SINGLE;default:throw new IllegalArgumentException("Unkown uri:"+uri);}}@Overridepublic int delete(Uri uri, String selection, String[] selectionArgs) {int count = 0;switch(uriMatcher.match(uri)){case MULTIPLE_PEOPLE:count = db.delete(DB_TABLE, selection, selectionArgs);break;case SINGLE_PEOPLE:String segment = uri.getPathSegments().get(1);count = db.delete(DB_TABLE, People.KEY_ID + "=" + segment, selectionArgs);break;default:throw new IllegalArgumentException("Unsupported URI:" + uri);}getContext().getContentResolver().notifyChange(uri, null);return count;}@Overridepublic Uri insert(Uri uri, ContentValues values) {long id = db.insert(DB_TABLE, null, values);if ( id > 0 ){Uri newUri = ContentUris.withAppendedId(People.CONTENT_URI, id);getContext().getContentResolver().notifyChange(newUri, null);return newUri;}throw new SQLException("Failed to insert row into " + uri);}@Overridepublic boolean onCreate() {Context context = getContext();dbOpenHelper = new DBOpenHelper(context, DB_NAME, null, DB_VERSION);db = dbOpenHelper.getWritableDatabase();if (db == null)return false;else return true;}@Overridepublic Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder) {SQLiteQueryBuilder qb = new SQLiteQueryBuilder();qb.setTables(DB_TABLE);switch(uriMatcher.match(uri)){case SINGLE_PEOPLE:qb.appendWhere(People.KEY_ID + "=" + uri.getPathSegments().get(1));break;default:break;}Cursor cursor = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder);cursor.setNotificationUri(getContext().getContentResolver(), uri);return cursor;}@Overridepublic int update(Uri uri, ContentValues values, String selection,String[] selectionArgs) {int count;switch(uriMatcher.match(uri)){case MULTIPLE_PEOPLE:count = db.update(DB_TABLE, values, selection, selectionArgs);break;case SINGLE_PEOPLE:String segment = uri.getPathSegments().get(1);count = db.update(DB_TABLE, values, People.KEY_ID+"="+segment, selectionArgs);break;default:throw new IllegalArgumentException("Unknow URI:" + uri);}getContext().getContentResolver().notifyChange(uri, null);return count;}  private static class DBOpenHelper extends SQLiteOpenHelper {  public DBOpenHelper(Context context, String name, CursorFactory factory, int version) {    super(context, name, factory, version);  }  private static final String DB_CREATE = "create table " +     DB_TABLE + " (" + People.KEY_ID + " integer primary key autoincrement, " +    People.KEY_NAME+ " text not null, " + People.KEY_AGE+ " integer," + People.KEY_HEIGHT + " float);";  @Override  public void onCreate(SQLiteDatabase _db) {    _db.execSQL(DB_CREATE);  }  @Override  public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion) {        _db.execSQL("DROP TABLE IF EXISTS " + DB_TABLE);    onCreate(_db);  }} }

People.java

package edu.hrbeu.ContentProviderDemo;import android.net.Uri;public class People{public static final String MIME_DIR_PREFIX = "vnd.android.cursor.dir";public static final String MIME_ITEM_PREFIX = "vnd.android.cursor.item";public static final String MINE_ITEM = "vnd.hrbeu.people";public static final String MINE_TYPE_SINGLE = MIME_ITEM_PREFIX + "/" + MINE_ITEM;public static final String MINE_TYPE_MULTIPLE = MIME_DIR_PREFIX + "/" + MINE_ITEM;public static final String AUTHORITY = "edu.hrbeu.peopleprovider";public static final String PATH_SINGLE = "people/#";public static final String PATH_MULTIPLE = "people";public static final String CONTENT_URI_STRING = "content://" + AUTHORITY + "/" + PATH_MULTIPLE;public static final Uri  CONTENT_URI = Uri.parse(CONTENT_URI_STRING); public static final String KEY_ID = "_id";public static final String KEY_NAME = "name";public static final String KEY_AGE = "age";public static final String KEY_HEIGHT = "height";}

ContentResolverDemo

ContentResolverDemoActivtiy.java

People.java同上

SQLite Demo

DBAdapter.java

package edu.hrbeu.SQLiteDemo;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteException;import android.database.sqlite.SQLiteOpenHelper;import android.database.sqlite.SQLiteDatabase.CursorFactory;public class DBAdapter {private static final String DB_NAME = "people.db";private static final String DB_TABLE = "peopleinfo";private static final int DB_VERSION = 1; public static final String KEY_ID = "_id";public static final String KEY_NAME = "name";public static final String KEY_AGE = "age";public static final String KEY_HEIGHT = "height";private SQLiteDatabase db;private final Context context;private DBOpenHelper dbOpenHelper;public DBAdapter(Context _context) {    context = _context;  }  /** Close the database */  public void close() {  if (db != null){  db.close();  db = null;  }}  /** Open the database */  public void open() throws SQLiteException {    dbOpenHelper = new DBOpenHelper(context, DB_NAME, null, DB_VERSION);  try {  db = dbOpenHelper.getWritableDatabase();  }  catch (SQLiteException ex) {  db = dbOpenHelper.getReadableDatabase();  }  }    public long insert(People people) {    ContentValues newValues = new ContentValues();      newValues.put(KEY_NAME, people.Name);    newValues.put(KEY_AGE, people.Age);    newValues.put(KEY_HEIGHT, people.Height);        return db.insert(DB_TABLE, null, newValues);  }  public People[] queryAllData() {    Cursor results =  db.query(DB_TABLE, new String[] { KEY_ID, KEY_NAME, KEY_AGE, KEY_HEIGHT},   null, null, null, null, null);  return ConvertToPeople(results);     }    public People[] queryOneData(long id) {    Cursor results =  db.query(DB_TABLE, new String[] { KEY_ID, KEY_NAME, KEY_AGE, KEY_HEIGHT},   KEY_ID + "=" + id, null, null, null, null);  return ConvertToPeople(results);     }    private People[] ConvertToPeople(Cursor cursor){  int resultCounts = cursor.getCount();  if (resultCounts == 0 || !cursor.moveToFirst()){  return null;  }  People[] peoples = new People[resultCounts];  for (int i = 0 ; i

package edu.hrbeu.SQLiteDemo;public class People {public int ID = -1;public String Name;public int Age;public float Height;@Overridepublic String toString(){String result = "";result += "ID：" + this.ID + "，";result += "姓名：" + this.Name + "，";result += "年龄：" + this.Age + "， ";result += "身高：" + this.Height + "，";return result;}}

package edu.hrbeu.SQLiteDemo;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class SQLiteDemoActivity extends Activity {    /** Called when the activity is first created. */private DBAdapter dbAdepter ;private EditText nameText;private EditText ageText;private EditText heightText;private EditText idEntry;private TextView labelView;private TextView displayView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                nameText = (EditText)findViewById(R.id.name);        ageText = (EditText)findViewById(R.id.age);        heightText = (EditText)findViewById(R.id.height);        idEntry = (EditText)findViewById(R.id.id_entry);                labelView = (TextView)findViewById(R.id.label);        displayView = (TextView)findViewById(R.id.display);                                Button addButton = (Button)findViewById(R.id.add);        Button queryAllButton = (Button)findViewById(R.id.query_all);              Button clearButton = (Button)findViewById(R.id.clear);        Button deleteAllButton = (Button)findViewById(R.id.delete_all);                Button queryButton = (Button)findViewById(R.id.query);        Button deleteButton = (Button)findViewById(R.id.delete);        Button updateButton = (Button)findViewById(R.id.update);                        addButton.setOnClickListener(addButtonListener);         queryAllButton.setOnClickListener(queryAllButtonListener);             clearButton.setOnClickListener(clearButtonListener);        deleteAllButton.setOnClickListener(deleteAllButtonListener);                      queryButton.setOnClickListener(queryButtonListener);        deleteButton.setOnClickListener(deleteButtonListener);        updateButton.setOnClickListener(updateButtonListener);                dbAdepter = new DBAdapter(this);        dbAdepter.open();    }        OnClickListener addButtonListener = new OnClickListener() {@Overridepublic void onClick(View v) {People people = new People();people.Name = nameText.getText().toString();people.Age = Integer.parseInt(ageText.getText().toString());people.Height = Float.parseFloat(heightText.getText().toString());long colunm = dbAdepter.insert(people);if (colunm == -1 ){labelView.setText("添加过程错误！");} else {labelView.setText("成功添加数据，ID："+String.valueOf(colunm));}}    };        OnClickListener queryAllButtonListener = new OnClickListener() {@Overridepublic void onClick(View v) {People[] peoples = dbAdepter.queryAllData();if (peoples == null){labelView.setText("数据库中没有数据");return;}labelView.setText("数据库：");String msg = "";for (int i = 0 ; i0?"成功":"失败");labelView.setText(msg);}    };        OnClickListener updateButtonListener = new OnClickListener() {@Overridepublic void onClick(View v) {People people = new People();people.Name = nameText.getText().toString();people.Age = Integer.parseInt(ageText.getText().toString());people.Height = Float.parseFloat(heightText.getText().toString());long id = Integer.parseInt(idEntry.getText().toString());long count = dbAdepter.updateOneData(id, people);if (count == -1 ){labelView.setText("更新错误！");} else {labelView.setText("更新成功，更新数据"+String.valueOf(count)+"条");}}    };}