Android常用代码集合

这篇文章主要记录一些常用的一些代码段，方便以后查阅，不断更新中。

1：调用浏览器，载入某网址

Uri uri = Uri.parse("http://www.android-study.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

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

<?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">

<intent-filter>

</intent-filter>

</activity>

<intent-filter>

</intent-filter>

</receiver>

</application>

<uses-sdk android:minSdkVersion="3" />

</manifest>

3：使用Toast输出一个字符串

public void DisplayToast(String str) {

Toast.makeText(this,str,Toast.LENGTH_SHORT).show();

}

4：把一个字符串写进文件

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

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Androidinstaller安装和卸载程序

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

1	activityManager.restartPackage(packageName);

8：设置默认来电铃声

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

1 2	<uses-permission android:name="android.permission.WRITE_SETTINGS"></uses-permission>

模拟HOME按键

Intent i=new Intent(Intent.ACTION_MAIN);

i.addCategory(Intent.CATEGORY_HOME);

i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(i);

9：打开某一个联系人

Intent intent=new Intent();

String data = "content://contacts/people/1";

Uri uri = Uri.parse(data);

intent.setAction(Intent.ACTION_VIEW);

intent.setData(uri);

startActivity(intent);

10：发送文件

void sendFile(String path) {

File mZipFile=new File(path);

Intent intent = new Intent(Intent.ACTION_SEND);

// intent.setClassName("com.android.bluetooth", "com.broadcom.bt.app.opp.OppLauncherActivity");

// intent.setClassName("com.android.bluetooth", "com.android.bluetooth.opp.BluetoothOppLauncherActivity");

intent.putExtra("subject", mZipFile

.getName()); //

intent.putExtra("body", "content by chopsticks"); // 正文

intent.putExtra(Intent.EXTRA_STREAM,

Uri.fromFile(mZipFile)); // 添加附件，附件为file对象

if (mZipFile.getName().endsWith(".gz")) {

intent

.setType("application/x-gzip"); // 如果是gz使用gzip的mime

} else if (mZipFile.getName().endsWith(

".txt")) {

intent.setType("text/plain"); // 纯文本则用text/plain的mime

} else if (mZipFile.getName().endsWith(

".zip")) {

intent.setType("application/zip"); // 纯文本则用text/plain的mime

} else {

intent

.setType("application/octet-stream"); // 其他的均使用流当做二进制数据来发送

}

// startActivity(intent);

startActivity(

Intent.createChooser(intent,

"选择蓝牙客户端"));

}

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