Android记录程序崩溃Log写入文件

将导致程序崩溃的堆栈调用Log写入文件，便于收集bug。在调试安卓程序，由于某些原因调试时手机不能连接PC端，无法通过IDE查看程序崩溃的Log，希望log能够写入文件中，对于已经发布的App可以通过该功能收集Bug。

import java.io.FileNotFoundException;  import java.io.FileOutputStream;  import java.io.IOException;  import java.io.PrintStream;  import java.lang.Thread.UncaughtExceptionHandler;    public class MyCrashHandler implements UncaughtExceptionHandler{     private static MyCrashHandler crashHandler;      @Override   public void uncaughtException(Thread thread, Throwable ex) {    // TODO Auto-generated method stub    if (crashHandler != null) {     try {      //将crash log写入文件      FileOutputStream fileOutputStream = new FileOutputStream("/mnt/sdcard/crash_log.txt", true);      PrintStream printStream = new PrintStream(fileOutputStream);      ex.printStackTrace(printStream);      printStream.flush();      printStream.close();      fileOutputStream.close();     } catch (FileNotFoundException e) {      // TODO Auto-generated catch block      e.printStackTrace();     } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }    }   }       //设置默认处理器   public void init() {    Thread.setDefaultUncaughtExceptionHandler(this);   }      private MyCrashHandler() {}      //单例   public static MyCrashHandler instance() {    if (crashHandler == null) {     synchronized (crashHandler) {      crashHandler = new MyCrashHandler();     }    }    return crashHandler;   }  }