先給大家展示下效果圖，如果大家感覺(jué)不錯(cuò)，請(qǐng)參考實(shí)現(xiàn)代碼

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效果圖如下所示：

代碼如下所示：

public class MainActivity extends Activity {
  View view;
  public static final int DRAG = 1;
  public static final int SCALE = 2;
  int mode = 1;
  int height = 10, width = 10;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);
    view = findViewById(R.id.view);
  }
  float length = 1;
  // 重寫(xiě)
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    int x = (int) event.getX();
    int y = (int) event.getY();
    // 多指觸控
    switch (event.getAction() & event.getActionMasked()) {
    case MotionEvent.ACTION_DOWN:
      mode = DRAG;
      break;
    case MotionEvent.ACTION_POINTER_DOWN:
      Log.e("TAG", "多指移動(dòng)");
      mode = SCALE;
      // 兩個(gè)手指開(kāi)始的長(zhǎng)度是多少呢？
      length = calc(event);
      break;
    case MotionEvent.ACTION_UP:
      length = 1;
      break;
    case MotionEvent.ACTION_MOVE:
      if (mode == DRAG) {
        // 1. 單個(gè)手指
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
            width, height);
        params.setMargins(x, y, 0, 0);
        view.setLayoutParams(params);
      } else {
        // 2. 兩個(gè)手指
        float beilv = calc(event) / length;
        width = (int) (view.getWidth() * beilv);
        height = (int) (view.getHeight() * beilv);
        Log.e("TAG", beilv + " " + width + " " + height);
        FrameLayout.LayoutParams params = (LayoutParams) view
            .getLayoutParams();
        params.width = width;
        params.height = height;
        view.setLayoutParams(params);
      }
      break;
    }
    return true;
  }
  // 類(lèi) Ponint
  public float calc(MotionEvent event) {
    float x1 = event.getX();
    float y1 = event.getY();
    float x2 = event.getX(1);
    float y2 = event.getY(1);
    return (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
  }
}

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