android studio gridlayout拼图游戏（一）让图片完整显示

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在慕课网上看到一个拼图游戏的视频，写了一个程序代码：

public class MainActivity extends AppCompatActivity {private boolean gamestart=false;private boolean isrun=false;private ImageView[][] iv_game_arr=new ImageView[3][5];private GridLayout game;private ImageView nullimg;private GestureDetector gestureDetector;@Override
    public boolean onTouchEvent(MotionEvent event) {return gestureDetector.onTouchEvent(event);}@Override
    public boolean dispatchTouchEvent(MotionEvent ev) {gestureDetector.onTouchEvent(ev);return super.dispatchTouchEvent(ev);}@Override
    protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);gestureDetector=new GestureDetector(this, new GestureDetector.OnGestureListener() {@Override
            public boolean onDown(MotionEvent motionEvent) {return false;}@Override
            public void onShowPress(MotionEvent motionEvent) {}@Override
            public boolean onSingleTapUp(MotionEvent motionEvent) {return false;}@Override
            public boolean onScroll(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {return false;}@Override
            public void onLongPress(MotionEvent motionEvent) {}@Override
            public boolean onFling(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {int type=getGesture(motionEvent.getX(),motionEvent.getY(),motionEvent1.getX(),motionEvent1.getY());changeGesture(type);return true;}});game=(GridLayout)findViewById(R.id.grid);Bitmap bigm=((BitmapDrawable)getResources().getDrawable(R.drawable.pin)).getBitmap();int tuW=bigm.getWidth()/5;for (i

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