转载：Android 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>