Android系统的“程序异常退出”，给应用的用户体验造成不良影响。为了捕获应用运行时异常并给出友好提示，便可继承类来处理。通过Thread.setDefaultUncaughtExceptionHandler()方法将异常处理类设置到线程上即可。

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);}@Overridepublic 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() {@Overridepublic 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() {@Overridepublic 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. */@Overridepublic 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();}}