Android記錄程序崩潰Log寫入文件

將導致程序崩潰的堆棧調用Log寫入文件，便于收集bug。在調試安卓程序，由于某些原因調試時手機不能連接PC端，無法通過IDE查看程序崩潰的Log，希望log能夠寫入文件中，對于已經發布的App可以通過該功能收集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 {
            //將crash log寫入文件
            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();
        }
    }
} 

//設置默認處理器
public void init() {
    Thread.setDefaultUncaughtExceptionHandler(this);
}

private MyCrashHandler() {}

//單例
public static MyCrashHandler instance() {
    if (crashHandler == null) {
        synchronized (crashHandler) {
            crashHandler = new MyCrashHandler();
        }
    }
    return crashHandler;
}

}</pre>