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;

@Override
public 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;
}

@Override
public 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。