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;
    }
}