Android使用Handler实现打地鼠游戏

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity">

 <ImageView
  android:id="@+id/imageView"
  android:layout_width="80dp"
  android:layout_height="80dp"
  android:src="@drawable/diglett"
  android:visibility="gone" />

 <Button
  android:id="@+id/button"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignParentBottom="true"
  android:layout_centerHorizontal="true"
  android:layout_marginBottom="45dp"
  android:text="点击开始" />

 <TextView
  android:id="@+id/textView"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignParentTop="true"
  android:layout_centerHorizontal="true"
  android:layout_marginTop="20dp"
  android:textColor="#ff0000"
  android:textSize="20sp" />
</RelativeLayout>

public class MainActivity extends AppCompatActivity implements View.OnClickListener, View.OnTouchListener {

 public static final int CODE = 999;
 public static final int RANDOM_NUMBER = 500;
 private TextView mTextView;
 private Button mButton;
 private ImageView mImageView;

 /**
  * 定义地鼠的位置
  */
 public int[][] mPosition = new int[][]{
   {342, 180}, {432, 880}, {521, 256}, {429, 780},
   {456, 976}, {145, 665}, {123, 678}, {564, 567},
 };

 private int mTotalCount, mSuccessCount = 0;
 public static final int MAX_COUNT = 10;

 private MyHandler mMyHandler = new MyHandler(this);

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  initView();
 }

 private void initView() {
  mTextView = findViewById(R.id.textView);
  mButton = findViewById(R.id.button);
  mImageView = findViewById(R.id.imageView);
  mButton.setOnClickListener(this);
  mImageView.setOnTouchListener(this);
 }

 @Override
 public void onClick(View v) {
  switch (v.getId()) {
   case R.id.button:
    start();
    break;
  }
 }

 private void start() {
  mTextView.setText("游戏开始了！");
  mButton.setText("游戏中...");
  mButton.setEnabled(false);
  //发送消息
  next(RANDOM_NUMBER);
 }

 private void next(int delayTime) {
  //产生一个0——数组长度的随机数
  int positon = new Random().nextInt(mPosition.length);
  Message message = Message.obtain();
  message.what = CODE;
  message.arg1 = positon;
  mMyHandler.sendMessageDelayed(message, delayTime);
  //每发送一次消息，总数就加一
  mTotalCount++;
 }

 /**
  * 图片点击事件
  * @param v
  * @param event
  * @return
  */
 @Override
 public boolean onTouch(View v, MotionEvent event) {
  //每次触碰到地鼠，则地鼠消失，打到地鼠的数量加一
  v.setVisibility(View.GONE);
  mSuccessCount++;
  mTextView.setText("打到了" + mSuccessCount + "只，共" + MAX_COUNT + "只");
  return false;
 }

 public static class MyHandler extends Handler {
  private final WeakReference<MainActivity> mWeakReference;

  public MyHandler(MainActivity activity) {
   this.mWeakReference = new WeakReference<>(activity);
  }

  @Override
  public void handleMessage(Message msg) {
   MainActivity activity = mWeakReference.get();
   super.handleMessage(msg);
   switch (msg.what) {
    case CODE:
     if (activity.mTotalCount > MAX_COUNT) {
      //游戏结束，初始化游戏
      activity.clear();
      Toast.makeText(activity, "地鼠打完了！", Toast.LENGTH_SHORT).show();
      return;
     } else {
      int position = msg.arg1;
      activity.mImageView.setX(activity.mPosition[position][0]);
      activity.mImageView.setY(activity.mPosition[position][1]);
      activity.mImageView.setVisibility(View.VISIBLE);
      //在随机位置上显示地鼠之后，再次发送消息
      int randomTime = new Random().nextInt(RANDOM_NUMBER) + RANDOM_NUMBER;
      activity.next(randomTime);
     }
     break;
   }
  }
 }

 /**
  * 游戏结束，初始化游戏
  */
 private void clear() {
  mTotalCount = 0;
  mSuccessCount = 0;
  mImageView.setVisibility(View.GONE);
  mButton.setText("点击开始");
  mButton.setEnabled(true);
 }
}