关于android连续点击出现多个Activity界面的解决方法

public class NoDoubleClickUtil {
  private static long lastClickTime;
  private final static int SPACE_TIME =2000;

  public static void initLastClickTime() {
    lastClickTime = 0;
  }

  public synchronized static boolean isDoubleClick() {
    long currentTime = System.currentTimeMillis();
    boolean isClickDouble;
    if (currentTime - lastClickTime >
        SPACE_TIME) {
      isClickDouble = false;
    } else {
      isClickDouble = true;
    }
    lastClickTime = currentTime;
    return isClickDouble;
  }
}

Intent intent = new Intent();
intent.setClass(getApplicationContext(), TargetActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(intent);

public class MyActvity extends Application {
  //创建一个集合，用来存放activity的对象
  ArrayList<Activity>list=new ArrayList<>();
  //声明一个本类的对象
  private static MyActvity instance;
  public MyActvity() {
  }
  //创建一个方法，用来初始化MyActivity的对象，并且初始化的对像的返回
  public synchronized static MyActvity getInstance(){
    if (instance==null){
      instance=new MyActvity();
    }
    return instance;
  }
  //调用此方法用来向集合当中添加activity对象
  public void addActivity(Activity activity){
    list.add(activity);
  }
  //判断activity是否已经在集合当中
  public boolean isexitlist(Activity activity){
    if (list.contains(activity)){
      return true;
    }
    return false;
  }
  //当调用此方法的时候，关闭所有的activity
  public void exit(){
    for (Activity activity:list){
      activity.finish();
    }
    //退出当前的MyActivity
    System.exit(0);
  }

  @Override
  public void onLowMemory() {
    super.onLowMemory();
    //当系统的存储空间不够的时候，调用系统的垃圾回收期，清理里面的垃圾
    System.gc();
  }
}

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //调用存放activity类
    MyActvity instance = MyActvity.getInstance();
    //判断存放activity类是否存放该activity，不存在加入类
    if (!instance.isexitlist(this)){
      instance.addActivity(this);
    }
    Intent intent = new Intent(this, Main2Activity.class);
    startActivity(intent);
  }
}

public class Main2Activity extends Activity {

  private MyActvity instance;

  /**
   * Called when the activity is first created.
   */

  @Override+
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sdfa);
    Button bt= (Button) findViewById(R.id.bt);
    instance = MyActvity.getInstance();
    if (!instance.isexitlist(this)){
      instance.addActivity(this);
    }
    bt.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
      //调用exit（）方法销毁里面所有activity
        instance.exit();
      }
    });

  }
}

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Intent intent = new Intent(this, Main2Activity.class);
    startActivity(intent);
    //注册广播
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(Define.PAHNAME);
    registerReceiver(new MyReceiver(),intentFilter);
  }
  class MyReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
      unregisterReceiver(this);
      ((Activity)context).finish();
    }
  }
}

public class Main2Activity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sdfa);
    Button bt= (Button) findViewById(R.id.bt);
    bt.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Intent intent = new Intent(Define.PAHNAME);
        sendBroadcast(intent);
        finish();
      }
    });

  }
}