Android UncaughtExceptionHandler捕获崩溃异常

在编写APK程序时，通常会有导致程序崩溃的异常，在通常情况下这些异常不能被捕获到，利用Thread.UncaughtExceptionHandler就可以捕获到这些异常。

在Application类中进行处理：

public class App extends Application implements UncaughtExceptionHandler{private static final boolean DEBUG = true;private static String TAG = "App";private static App app;private UncaughtExceptionHandler originalHandler;@Overridepublic void uncaughtException(Thread thread, Throwable ex) {    try{        File fold = this.getExternalRoot();        SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH.mm.ss.SSS" );        String fileName = "crash " + sdf.format( new Date() );        File file = new File( fold, fileName );        FileOutputStream fos = new FileOutputStream( file );        PrintWriter ps = new PrintWriter( fos );        this.logcat( ps );        ex.printStackTrace( ps );        ps.close();      }catch( Exception e ){        Log.e( App.class.getName(), "Can not save exception.", e );      }finally{        if( this.originalHandler != null ){          this.originalHandler.uncaughtException( thread, ex );        }else{          Log.e( this.getPackageName(), "Thread " + thread.getName() + " exit with uncaught exception.", ex );          System.exit( 1 );        }      }}  public App(){    app = this;    if( ! DEBUG ){      originalHandler = Thread.getDefaultUncaughtExceptionHandler();      Thread.setDefaultUncaughtExceptionHandler( this );    }  }  public File getExternalRoot(){    File retVal = Environment.getExternalStorageDirectory();    if( retVal != null ){      retVal = new File( retVal, this.getPackageName() );      if( ! retVal.exists() && ! retVal.mkdir() ){        retVal = null;      }    }    return retVal;  }  @Overridepublic void onCreate() {super.onCreate();if(!DEBUG){      try{          File fold = this.getExternalRoot();          SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd_HH.mm.ss.SSS" );          String fileName = "brains" + sdf.format( new Date() ) + ".log";          File file = new File( fold, fileName );          FileOutputStream fos = new FileOutputStream( file );          PrintStream ps = new PrintStream( fos );                com.hgy.brains.log.Log.setLevel( com.hgy.brains.log.Log.VERBOSE );          com.hgy.brains.log.Log.setLogOutput( ps );        }catch( Exception ex ){          android.util.Log.e( TAG, "Can not initialize log output", ex );        }}}  private void logcat( PrintWriter ps ){    try{      ArrayList< String > commandLine = new ArrayList< String >();      commandLine.add( "logcat" );      commandLine.add( "-d" );      commandLine.add( "-v" );      commandLine.add( "long" );      commandLine.add( "*:V" );            Process process = Runtime.getRuntime().exec( commandLine.toArray( new String[ commandLine.size() ] ) );      BufferedReader bufferedReader = new BufferedReader( new InputStreamReader( process.getInputStream() ) );            String line;      String lineSeparator = System.getProperty( "line.separator" );      while( ( line = bufferedReader.readLine() ) != null ){        ps.append( line );        ps.append( lineSeparator );      }      bufferedReader.close();    }catch( IOException e ){        Log.e( TAG, "Dump log failed", e);    }  }    }

生成对应的crash文件，里面包含了异常的详细信息。