Question

我在ImageView中有一个Button和一个LinearLayout。我想在屏幕上拖动ImageView，但保留Button。但出于某种原因，当我拖动ImageView Button拖拽它时。

有人可以帮忙吗？

代码：

activity_main.xml中

<LinearLayout
    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"
    android:orientation="vertical"
    android:gravity="center"
    android:weightSum=10
    android:id="@+id/main">

        <ImageView
            android:id="@+id/image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/my_pic"
            android:layout_weight="2"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="2.5"/>

        <ImageView
            android:id="@+id/click"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/btn_click"
            android:layout_weight="2"/>

    </LinearLayout>

MainActivity.java

public class MainActivity extends ActionBarActivity implements View.OnTouchListener
{
    ImageView img;
    private ViewGroup mRrootLayout;
    private int _xDelta;
    private int _yDelta;

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

        mRrootLayout = (ViewGroup) findViewById(R.id.main);
        img = (ImageView) mRrootLayout.findViewById(R.id.image);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(300, 300);

        img.setLayoutParams(layoutParams);
        img.setOnTouchListener(this);
    }

修改

    public boolean onTouch(View view, MotionEvent event) {
        switch (view.getId()) {
            case R.id.logo:
                final int X = (int) event.getRawX();
                final int Y = (int) event.getRawY();
                switch (event.getAction() & MotionEvent.ACTION_MASK) {
                    case MotionEvent.ACTION_DOWN:
                        LinearLayout.LayoutParams lParams = (LinearLayout.LayoutParams) view.getLayoutParams();
                        _xDelta = X - lParams.leftMargin;
                        _yDelta = Y - lParams.topMargin;
                        break;
                    case MotionEvent.ACTION_UP:
                        break;
                    case MotionEvent.ACTION_POINTER_DOWN:
                        break;
                    case MotionEvent.ACTION_POINTER_UP:
                        break;
                    case MotionEvent.ACTION_MOVE:
                        LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) view
                                .getLayoutParams();
                        layoutParams.leftMargin = X - _xDelta;
                        layoutParams.topMargin = Y - _yDelta;
                        layoutParams.rightMargin = -250;
                        layoutParams.bottomMargin = -250;
                        view.setLayoutParams(layoutParams);
                        break;
                }
                mRrootLayout.invalidate();
                break;

            case R.id.fade:
                return false;
        }

        return true;
    }

Answer 1

在onTouch中，您应该检查哪个视图正在被触摸，因此您只知道移动该视图。例如：

public boolean onTouch(View view, MotionEvent event) {
    switch (view.getId()) {
        case R.id.image:

            //Your code goes here

            break;
    }

    return true;
}

这样，只会移动您引用的视图。

图像拖动导致按钮拖动

1 个答案: