转载:Android(安卓)常用代码集合
http://blog.csdn.net/Zengyangtech/archive/2010/07/20/5748674.aspx
这篇文章主要记录一些我常用的一些代码段,方便以后查阅,不断更新中
1 调用浏览器 载入某网址
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Uri uri = Uri.parse("http://www.baidu.com");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
2 Broadcast接收系统广播的intent 监控应用程序包的安装 删除
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public class getBroadcast extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if(Intent.ACTION_PACKAGE_ADDED.equals(intent.getAction())){
Toast.makeText(context, "有应用被添加", Toast.LENGTH_LONG).show();
}
else if(Intent.ACTION_PACKAGE_REMOVED.equals(intent.getAction())){
Toast.makeText(context, "有应用被删除", Toast.LENGTH_LONG).show();
}
else if(Intent.ACTION_PACKAGE_REPLACED.equals(intent.getAction())){
Toast.makeText(context, "有应用被替换", Toast.LENGTH_LONG).show();
}
else if(Intent.ACTION_CAMERA_BUTTON.equals(intent.getAction())){
Toast.makeText(context, "按键", Toast.LENGTH_LONG).show();
}
}
}
需要声明的权限如下AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="zy.Broadcast"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Broadcast"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="getBroadcast" android:enabled="true" >
<intent-filter>
<action android:name="android.intent.action.PACKAGE_ADDED"></action>
<!-- <action android:name="android.intent.action.PACKAGE_CHANGED"></action>-->
<action android:name="android.intent.action.PACKAGE_REMOVED"></action>
<action android:name="android.intent.action.PACKAGE_REPLACED"></action>
<!-- <action android:name="android.intent.action.PACKAGE_RESTARTED"></action>-->
<!-- <action android:name="android.intent.action.PACKAGE_INSTALL"></action>-->
<action android:name="android.intent.action.CAMERA_BUTTON"></action>
<data android:scheme="package"></data>
</intent-filter>
</receiver>
</application>
<uses-sdk android:minSdkVersion="3" />
</manifest>
3 使用Toast输出一个字符串
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public void DisplayToast(String str)
{
Toast.makeText(this,str,Toast.LENGTH_SHORT).show();
}
4 把一个字符串写进文件
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public void writefile(String str,String path )
{
File file;
FileOutputStream out;
try {
//创建文件
file = new File(path);
file.createNewFile();
//打开文件file的OutputStream
out = new FileOutputStream(file);
String infoToWrite = str;
//将字符串转换成byte数组写入文件
out.write(infoToWrite.getBytes());
//关闭文件file的OutputStream
out.close();
} catch (IOException e) {
//将出错信息打印到Logcat
DisplayToast(e.toString());
}
}
5 把文件内容读出到一个字符串
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public String getinfo(String path)
{
File file;
String str="";
FileInputStream in;
try{
//打开文件file的InputStream
file = new File(path);
in = new FileInputStream(file);
//将文件内容全部读入到byte数组
int length = (int)file.length();
byte[] temp = new byte[length];
in.read(temp, 0, length);
//将byte数组用UTF-8编码并存入display字符串中
str = EncodingUtils.getString(temp,TEXT_ENCODING);
//关闭文件file的InputStream
in.close();
}
catch (IOException e) {
DisplayToast(e.toString());
}
return str;
}
6 调用Android installer 安装和卸载程序
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Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File("/sdcard/WorldCupTimer.apk")), "application/vnd.android.package-archive");
startActivity(intent); //安装 程序
Uri packageURI = Uri.parse("package:zy.dnh");
Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
startActivity(uninstallIntent);//正常卸载程序
7 结束某个进程
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activityManager.restartPackage(packageName);
8 设置默认来电铃声
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public void setMyRingtone()
{
File k = new File("/sdcard/Shall We Talk.mp3"); // 设置歌曲路径
ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath());
values.put(MediaStore.MediaColumns.TITLE, "Shall We Talk");
values.put(MediaStore.MediaColumns.SIZE, 8474325);
values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/mp3");
values.put(MediaStore.Audio.Media.ARTIST, "Madonna");
values.put(MediaStore.Audio.Media.DURATION, 230);
values.put(MediaStore.Audio.Media.IS_RINGTONE, true);
values.put(MediaStore.Audio.Media.IS_NOTIFICATION, false);
values.put(MediaStore.Audio.Media.IS_ALARM, false);
values.put(MediaStore.Audio.Media.IS_MUSIC, false);
// Insert it into the database
Uri uri = MediaStore.Audio.Media.getContentUriForPath(k.getAbsolutePath());
Uri newUri = this.getContentResolver().insert(uri, values);
RingtoneManager.setActualDefaultRingtoneUri(this, RingtoneManager.TYPE_RINGTONE, newUri);
;}
需要的权限
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<uses-permission android:name="android.permission.WRITE_SETTINGS"></uses-permission>
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