画廊失去焦点

Question

我写了一个代码来放大图库中选定的图像，我不知道为什么每次滚动时图库都会失去焦点，这是我的代码。

gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        public void onItemSelected(AdapterView<?> parent, View v,
                int position, long id) {

            if (lasview != null)
                lasview
                        .setLayoutParams(new Gallery.LayoutParams(130, 195));
            lasview = v;
            v.setLayoutParams(new Gallery.LayoutParams(170, 230));

        }

        public void onNothingSelected(AdapterView<?> parent) {
            // System.out.println("NOTHING SELECTED");

        }
    });

Answer 1

尝试lasview.getLayoutParams() ，然后在检索到的LayoutParams上设置值。
调用setLayoutParams()会导致重新绘制/刷新，这可能会导致您的问题。

Answer 2

我自己这样解决了这个问题。

     <Gallery
        android:id="@+id/gallery1"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="50"
        android:nextFocusDown="@+id/gallery1"
        android:nextFocusLeft="@+id/gallery1"
        android:nextFocusRight="@+id/gallery1"
        android:nextFocusUp="@+id/gallery1" 
        android:focusable="false"
        android:clickable="false"
        android:focusableInTouchMode="false"
        android:descendantFocusability="afterDescendants"/>

在活动中

    @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {

        gl.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);

        return true;
    }
    if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {

        gl.onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, null);

        return true;
    }
            return false;

}

这个对我有用。