两个图像拖动

Question

我正在制作一个模块,其中每当我触摸一个图像时我有两个图像它应该在拖动时跟随手指或鼠标(在模拟器中)并且如果它越过另一个图像然后它们改变它们在第一次触摸时第一个图像的位置(ACTION_DOWN).我写了下面的代码,其中视图正在移动,但当我拖动第一个图像时,第二个图像也被拖动.进一步想知道如何改变立场.

.XML

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:id="@+id/vg"
   >

<ImageView   
    android:id="@+id/img"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
       />
 <ImageView   
    android:id="@+id/img1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />
</LinearLayout>

活动文件

public class MainActivity extends Activity {
    private View selected_item = null;
    private int offset_x = 0;
    private int offset_y = 0;
    Canvas can;
    Paint paint;
    ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ViewGroup vg = (ViewGroup)findViewById(R.id.vg);
    vg.setOnTouchListener(new View.OnTouchListener() {

                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                            switch(event.getActionMasked())
                            {

                                    case MotionEvent.ACTION_MOVE:
                                        if(selected_item == img) {
                                            int x = (int)event.getX() - offset_x;
                                            int y = (int)event.getY() - offset_y;

                    int w = getWindowManager().getDefaultDisplay().getWidth() - 100;
                    int h = getWindowManager().getDefaultDisplay().getHeight() - 100;
                    if(x > w)
                        x = w;
                    if(y > h)
                        y = h;
                                     LinearLayout.LayoutParams lp = new  LinearLayout.LayoutParams(
                                    new ViewGroup.MarginLayoutParams(
                                                    100,
                                                    100));
                                     lp.setMargins(x, y, 0, 0);

                                            selected_item.setLayoutParams(lp); 
                                        }
                                            break;
                                    default:
                                            break;
                            }
                            return true;
                    }
  });
   img = (ImageView)findViewById(R.id.img);

   //timerDelayRemoveView(500, img);

   BitmapDrawable drawable = (BitmapDrawable)getResources().getDrawable(R.drawable.imagesl_02); 
   Bitmap bitmap = drawable.getBitmap();
   Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, 100, 100, true);
   img.setImageBitmap(scaledBitmap);
   LinearLayout.LayoutParams lp0 = new LinearLayout.LayoutParams(100, 100);
   lp0.leftMargin = 0;
   lp0.topMargin = 0;
   img.setLayoutParams(lp0);
   //vg.addView(img, lp1);
  // vg.addView(img, 1);
    img.setOnTouchListener(new View.OnTouchListener() {

                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                            switch(event.getActionMasked())
                            {
                                    case MotionEvent.ACTION_DOWN:
                                            offset_x = (int)event.getX();
                                            offset_y = (int)event.getY();
                                            selected_item = v;
                          Toast.makeText(MainActivity.this, "down",Toast.LENGTH_SHORT).show();
                                            break;

                            default: break;        
                            }

                            return false;
                    }
            });

    ImageView img1 = (ImageView)findViewById(R.id.img1);
    BitmapDrawable drawable1 = (BitmapDrawable)getResources().getDrawable(R.drawable.realimage); 
    Bitmap bitmap1 = drawable1.getBitmap();
    Bitmap scaledBitmap1 = Bitmap.createScaledBitmap(bitmap1, 100, 100, true);
    img1.setImageBitmap(scaledBitmap1);
    LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(100, 100);
    lp1.leftMargin = 100;
    lp1.topMargin = 100;
    img1.setLayoutParams(lp1);

    //img.setImageBitmap(scaledBitmap1);

    img1.setOnTouchListener(new View.OnTouchListener() {

                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                            switch(event.getActionMasked())
                            {
                                    case MotionEvent.ACTION_DOWN:
                                           // offset_x = (int)event.getX();
                                           // offset_y = (int)event.getY();
                                            selected_item = v;
                                            break;
                                    default:
                                            break;
                            }

                            return false;
                    }
            }); 

}
  }

Answer 1

第二个图像被拖动，因为两个图像都在 LinearLayout 中。第二个图像的布局参数取决于第一个图像，这意味着当您向右调整它们时，第二个图像将绑定到第一个图像的右边缘。

如果我正在解决这个问题（假设我无法使用 Honeycomb 中引入的拖动 API），我会首先将所有内容放入RelativeLayout2ImageView秒中。当您“拾取”其中一张图像时，您可以在移动它时调整其布局参数，然后当您放下它时，您可以调整LayoutParams两者的布局参数以满足您所需的布局。