用UncaughtExceptionHandler处理意外错误
用UncaughtExceptionHandler处理意外异常
UncaughtExceptionHandler接口用来捕获运行时未被程序捕获异常.
用处:
# 某些特殊情况下的异常处理以及线程重新load,从而成为”永远存在“的线程。
# 友好退出,善后处理,比如保存游戏币等
使用:
- try {
- Thread caughtableThread = new Thread(new Task());
- caughtableThread.setUncaughtExceptionHandler(new SimpleUncaughtExceptionHandler());
- caughtableThread.start();
- } catch (Exception e) {
- System.out.print("can do somthing");//依然不会出执行
- e.printStackTrace();
- }
- static class SimpleUncaughtExceptionHandler implements UncaughtExceptionHandler {
- @Override
- public void uncaughtException(Thread t, Throwable e) {
- System.err.println(t.getName() + " " +e.getMessage());//这里会捕获异常。
- e.printStackTrace();
- }
- }
Android中:
1、异常处理类,代码如下:
public class CrashHandler implements UncaughtExceptionHandler { public static final String TAG = "CrashHandler"; private static CrashHandler INSTANCE = new CrashHandler(); private Context mContext; private Thread.UncaughtExceptionHandler mDefaultHandler; private CrashHandler() { } public static CrashHandler getInstance() { return INSTANCE; } public void init(Context ctx) { mContext = ctx; mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler(); Thread.setDefaultUncaughtExceptionHandler(this); } @Override public void uncaughtException(Thread thread, Throwable ex) { // if (!handleException(ex) && mDefaultHandler != null) { // mDefaultHandler.uncaughtException(thread, ex); // } else { // android.os.Process.killProcess(android.os.Process.myPid()); // System.exit(10); // } System.out.println("uncaughtException"); new Thread() { @Override public void run() { Looper.prepare(); new AlertDialog.Builder(mContext).setTitle("提示").setCancelable(false) .setMessage("程序崩溃了...").setNeutralButton("我知道了", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { System.exit(0); } }) .create().show(); Looper.loop(); } }.start(); } /** * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成. 开发者可以根据自己的情况来自定义异常处理逻辑 * * @param ex * @return true:如果处理了该异常信息;否则返回false */ private boolean handleException(Throwable ex) { if (ex == null) { return true; } // new Handler(Looper.getMainLooper()).post(new Runnable() { // @Override // public void run() { // new AlertDialog.Builder(mContext).setTitle("提示") // .setMessage("程序崩溃了...").setNeutralButton("我知道了", null) // .create().show(); // } // }); return true; } }
2、线程绑定异常处理类
public class CrashHandlerActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); CrashHandler crashHandler = CrashHandler.getInstance(); crashHandler.init(this); //传入参数必须为Activity,否则AlertDialog将不显示。 // 创建错误 throw new NullPointerException(); } }
参考:
http://orgcent.com/android-uncaughtexceptionhandler-exception/
http://fantaxy025025.iteye.com/admin/blogs/new