第一章:初入Android大门(不同的Activity之间的数据传递与回调--setActivityForResult)

从数据Activity传递至Activity2这样的做发可以恢复User输入数据,当然也可以采用Bundle方式再传递一次也可以但是这样感觉很别扭。
效果:

直接看代码
main.xml

<?xml version="1.0" encoding="utf-8"?><AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><EditTextandroid:id="@+id/heigths"android:layout_width="129px"android:layout_height="wrap_content"android:textSize="18sp"android:layout_x="122px"android:layout_y="141px"></EditText><RadioGroup android:id="@+id/sexs"        android:layout_width="wrap_content"android:layout_x="122px"android:orientation="horizontal"android:layout_y="87px"        android:layout_height="wrap_content"><RadioButtonandroid:id="@+id/boy"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="&#30007;"></RadioButton><RadioButtonandroid:id="@+id/gril"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="&#22899;"></RadioButton></RadioGroup><TextViewandroid:id="@+id/sexText"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="&#24615;&#21035;:"android:layout_x="51px"android:layout_y="102px"></TextView><TextViewandroid:id="@+id/heigth"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="&#36523;&#39640;:"android:layout_x="51px"android:layout_y="152px"></TextView><Buttonandroid:id="@+id/count"android:layout_width="74px"android:layout_height="wrap_content"android:text="&#35745;&#31639;"android:layout_x="140px"android:layout_y="203px"></Button></AbsoluteLayout>

layout2.xml

<?xml version="1.0" encoding="utf-8"?><AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextViewandroid:id="@+id/text"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="&#24615;&#21035;:"android:layout_x="74px"android:layout_y="106px"></TextView><Buttonandroid:id="@+id/back"android:layout_width="74px"android:layout_height="wrap_content"android:text="@string/back"android:layout_x="140px"android:layout_y="203px"></Button></AbsoluteLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, BackTransferData!</string>      <string name="back">返回</string>    <string name="app_name">BackTransferData</string></resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="back.transfer.data"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".BackTransferData"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity><activity android:name=".BackTransferData2"></activity>    </application></manifest>

R.java

/* AUTO-GENERATED FILE.  DO NOT MODIFY. * * This class was automatically generated by the * aapt tool from the resource data it found.  It * should not be modified by hand. */package back.transfer.data;public final class R {    public static final class attr {    }    public static final class drawable {        public static final int icon=0x7f020000;    }    public static final class id {        public static final int back=0x7f050001;        public static final int boy=0x7f050004;        public static final int count=0x7f050008;        public static final int gril=0x7f050005;        public static final int heigth=0x7f050007;        public static final int heigths=0x7f050002;        public static final int sexText=0x7f050006;        public static final int sexs=0x7f050003;        public static final int text=0x7f050000;    }    public static final class layout {        public static final int layout2=0x7f030000;        public static final int main=0x7f030001;    }    public static final class string {        public static final int app_name=0x7f040002;        public static final int back=0x7f040001;        public static final int hello=0x7f040000;    }}

BackTransferData.java

package back.transfer.data;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.RadioButton;public class BackTransferData extends Activity {    /** Called when the activity is first created. */private Button bt;EditText et;private RadioButton rb;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        /**载入main.xml*/        setContentView(R.layout.main);        /**找到文本框*/        et=(EditText)findViewById(R.id.heigths);        /**找到计算按钮*/        bt=(Button)findViewById(R.id.count);        /**设置按钮的监听事件*/        bt.setOnClickListener(new Button.OnClickListener(){        public void onClick(View v){        /**判断是否被选中*/        String sex="女";        rb=(RadioButton)findViewById(R.id.boy);        if(rb.isChecked()){        sex="男";        }        /**把取得的字符串转换成double类型*/        double height=Double.parseDouble((et.getText()).toString());        /**实例化Bundle对像,把将要传递的数据以键值对的形式添加进去*/        Bundle bundle=new Bundle();        /**添加的是Double类型的数值*/        bundle.putDouble("height", height);        /**添加的是String类型的数值*/        bundle.putString("sex", sex);        /**实例化Intent对像,并指定传递的class*/        Intent intent=new Intent();        intent.setClass(BackTransferData.this, BackTransferData2.class);        /**将设置好值的Bundle对象添加进Intent*/        intent.putExtras(bundle);        /**调用TransferData2 其中startActivityForResult(intent, 0)的0代表下一个要传递Activity要返回的数据可以自定义*/        startActivityForResult(intent, 0);        }        });    }        /**覆盖onActivityResult方法*/@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {/**取得Bundle对象*/Bundle bundle=data.getExtras();/**取得对应sex键的值*/String sex=bundle.getString("sex");/**取得对应height键的值*/double height=bundle.getDouble("height");/**设置哪个RadioButton按钮被选中*/RadioButton rb2=(RadioButton)findViewById(R.id.gril);et.setText(""+height);if(sex.equals("男")){rb.setChecked(true);}else{rb2.setChecked(true);}}        }

BackTransferData2.java

package back.transfer.data;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;public class BackTransferData2 extends Activity {    /** Called when the activity is first created. */private Button bt;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        /**载入layout2.xml*/        setContentView(R.layout.layout2);        /**找到TextView*/        TextView text=(TextView)findViewById(R.id.text);        /**获取Bundle*/        Bundle bundle=this.getIntent().getExtras();        /**对TextView设值*/        text.setText("性别:"+bundle.getString("sex")+"\n身高:"+bundle.getDouble("height"));        /**找到Button*/        bt=(Button)findViewById(R.id.back);        /**设置bt按钮的监听事件*/        bt.setOnClickListener(new Button.OnClickListener(){        public void onClick(View v){        /**返回results回上一个activity*/        BackTransferData2.this.setResult(RESULT_OK,BackTransferData2.this.getIntent());        /**结束当前activity*/        BackTransferData2.this.finish();        }        });    }}

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