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

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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

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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Androidinstaller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

1	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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模拟HOME按键

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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

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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

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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")); }