Android 常用代碼

Uri uri = Uri.parse("");         

Intent it = new Intent(Intent.ACTION_VIEW, uri);         

startActivity(it); 

2 Broadcast接收系統廣播的intent 監控應用程序包的安裝 刪除

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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, "有應用被添加", Toast.LENGTH_LONG).show(); 

            } 

                else  if(Intent.ACTION_PACKAGE_REMOVED.equals(intent.getAction())){ 

                    Toast.makeText(context, "有應用被刪除", Toast.LENGTH_LONG).show(); 

            } 

                else  if(Intent.ACTION_PACKAGE_REPLACED.equals(intent.getAction())){ 

                    Toast.makeText(context, "有應用被替換", Toast.LENGTH_LONG).show(); 

            } 

                else  if(Intent.ACTION_CAMERA_BUTTON.equals(intent.getAction())){ 

                    Toast.makeText(context, "按鍵", Toast.LENGTH_LONG).show(); 

            } 

        } 

} 

需要聲明的權限如下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輸出一個字符串

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public void DisplayToast(String str) 

        { 

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

        }  

4 把一個字符串寫進文件

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public void writefile(String str,String path ) 

        { 

            File file; 

            FileOutputStream out; 

             try { 

                 //創建文件 

                 file = new File(path); 

                 file.createNewFile(); 

                 //打開文件file的OutputStream 

                 out = new FileOutputStream(file); 

                 String infoToWrite = str; 

                 //將字符串轉換成byte數組寫入文件 

                 out.write(infoToWrite.getBytes()); 

                 //關閉文件file的OutputStream 

                 out.close(); 

             } catch (IOException e) { 

                 //將出錯信息打印到Logcat 

              DisplayToast(e.toString()); 

             } 

        } 

5 把文件內容讀出到一個字符串

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public String getinfo(String path) 

        { 

            File file; 

            String str="";  

            FileInputStream in; 

         try{ 

            //打開文件file的InputStream 

             file = new File(path); 

             in = new FileInputStream(file); 

             //將文件內容全部讀入到byte數組 

             int length = (int)file.length(); 

             byte[] temp = new byte[length]; 

             in.read(temp, 0, length); 

             //將byte數組用UTF-8編碼並存入display字符串中 

             str =  EncodingUtils.getString(temp,TEXT_ENCODING); 

             //關閉文件file的InputStream 

             in.close(); 

         } 

         catch (IOException e) { 

          DisplayToast(e.toString()); 

         } 

         return str; 

        } 

6 調用android installer 安裝和卸載程序

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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); //安裝 程序 

       Uri packageURI = Uri.parse("package:zy.dnh");      

       Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);      

       startActivity(uninstallIntent);//正常卸載程序 

7 結束某個進程

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activityManager.restartPackage(packageName); 

8 設置默認來電鈴聲

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public void setMyRingtone() 

    { 

   File k = new File("/sdcard/Shall We Talk.mp3"); // 設置歌曲路徑 

    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); 

    ;} 

需要的權限

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