Android-小小设置永久解决程序因为未捕获异常而异常终止的问题

public class CrashHandler implements UncaughtExceptionHandler {
 
    private static CrashHandler instance;  //单例引用，这里我们做成单例的，因为我们一个应用程序里面只需要一个UncaughtExceptionHandler实例
     
    private CrashHandler(){}
     
    public synchronized static CrashHandler getInstance(){  //同步方法，以免单例多线程环境下出现异常
         if (instance == null){
             instance = new CrashHandler();
         }
         return instance;
     }
     
    public void init(Context ctx){  //初始化，把当前对象设置成UncaughtExceptionHandler处理器
         Thread.setDefaultUncaughtExceptionHandler(this);
     }
     
    @Override
     public void uncaughtException(Thread thread, Throwable ex) {  //当有未处理的异常发生时，就会来到这里。。 
        Log.d("Sandy", "uncaughtException, thread: " + thread
                 + " name: " + thread.getName() + " id: " + thread.getId() + "exception: "
                 + ex);
              String threadName = thread.getName();
              if ("sub1".equals(threadName)){
                    Log.d("Sandy", ""xxx);
              }else if(){
                       //这里我们可以根据thread name来进行区别对待，同时，我们还可以把异常信息写入文件，以供后来分析。
               }
     }
 
}

public class OurApplication extends Application {
 
    @Override
     public void onCreate() {
         super.onCreate();
         CrashHandler handler = CrashHandler.getInstance();
         handler.init(getApplicationContext()); //在Appliction里面设置我们的异常处理器为UncaughtExceptionHandler处理器
     }
 }

<application
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name" 
        android:name=".OurApplication"
         android:debuggable="true"
         >

Button btn = (Button) findViewById(R.id.bt);
         btn.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
             
                 Thread thread = new Thread(new Runnable() {
                     @Override
                     public void run() {
                         Log.d("Sandy", "I am a sub thread");
                         String s = null;
                         s.toString();  //抛出NullPointException
                     }
                 }, "sub  thread");
                 thread.start();
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