ScrollViewを聞いて、スクロールしているかどうかを確認したいと思います。OnTouchListenerを使用しましたが、うまく機能します。しかし、OnKeyListenerを使用して、またはOnKeydownメソッドをオーバーライドして、トラックボールに互換性を追加したい場合、それは機能しません。子ボタンがフォーカスを取得すると問題が発生するようです。
この問題を解決するための解決策または回避策はありますか?どんな助けでも大歓迎です。
これが私の問題を再現するためのいくつかのデモコードです:
public class TestActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ScrollView scrollView = (ScrollView) findViewById(R.id.scroll_view);
LinearLayout mainLayout = (LinearLayout) findViewById(R.id.main_layout);
LinearLayout.LayoutParams wrapParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
for (int i = 0; i < 100; i++) {
MyItem item = (MyItem) LayoutInflater.from(this).inflate(R.layout.item, null);
item.setParent(scrollView);
item.setBackgroundColor(Color.WHITE);
item.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
mainLayout.addView(item, wrapParams);
}
scrollView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// can go into here
}
});
scrollView.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN || keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
// never go in, unless no child button get focus
}
return false;
}
});
}
}
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<com.fannyxie.MyScroller
android:id="@+id/scroll_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:descendantFocusability="beforeDescendants"
android:clickable="true"
android:focusable="true">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<LinearLayout android:id="@+id/main_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>
</com.fannyxie.MyScroller>
</LinearLayout>
item.xml:
<?xml version="1.0" encoding="utf-8"?>
<com.fannyxie.MyItem xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="TITLE"/>
<Button android:layout_width="wrap_content" android:layout_height="wrap_content"
android:id="@+id/myButton" android:text="Button"></Button>
</com.fannyxie.MyItem>
MyScroller.java
public class MyScroller extends ScrollView {
public MyScroller(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//not go into here...
Log.i("MyScroller", "onKeyDown");
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onTrackballEvent(MotionEvent event) {
//not go into here...
Log.i("MyScroller", "onTrackballEvent");
return super.onTrackballEvent(event);
}
@Override
protected boolean onRequestFocusInDescendants(int direction,
Rect previouslyFocusedRect) {
//some times go into here, when no button get the focus when entering first time
Log.i("MyScroller", "request focus in descendants");
return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
}
}
MyItem.java
public class MyItem extends LinearLayout {
private Button myButton;
public MyItem(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected boolean onRequestFocusInDescendants(int direction,
Rect previouslyFocusedRect) {
// never go into here
Log.i("MyItem", "request focus in descendants");
return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
}
}