Android 常用代码集合-优快云博客

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

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

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"> <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_REMOVED"></action> <action android:name="android.intent.action.PACKAGE_REPLACED"></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

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Android installer 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

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

<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);