Android

Question

我在 ScrollView 里面有一个 Button。

<ScrollView>
    <LinearLayout>
        ...
        <Button/>
        ...
    <LinearLayout/>
</ScrollView>

我正在使用此按钮重新编码语音。当它捕捉到 MotionEvent.ACTION_DOWN 事件时，我开始记录，在 MotionEvent.ACTION_UP 事件上我停止它。

buttomRecord.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN){
            startRecording();
            return true;
        }
        else if(event.getAction() == MotionEvent.ACTION_UP){
            stopRecording();
            return true;
        }
        return false;
    }
});

问题是当用户正在录音时，如果这个 ScrollView 向下或向上滚动，这个按钮将失去焦点并且永远不会捕捉到 MotionEvent.ACTION_UP 事件。

如何在按住 Button 或禁用 [=14=] 滚动时将焦点锁定在 Button 上？

Answer 1

您可以使用

mScrollView.requestDisallowInterceptTouchEvent(true);

禁止 scrollview 的触摸事件

所以你的代码将是

    buttomRecord.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN){
            startRecording();
            mScrollView.requestDisallowInterceptTouchEvent(true);
            return true;
        }
        else if(event.getAction() == MotionEvent.ACTION_UP){
            stopRecording();
            mScrollView.requestDisallowInterceptTouchEvent(false);
            return true;
        }
        return false;
    }
});

Answer 2

使用这个自定义滚动视图：

public class CustomScrollView extends ScrollView {

private boolean mScrollable = true;

public void setScrollingEnabled(boolean enabled) {
    mScrollable = enabled;
}

public boolean isScrollable() {
    return mScrollable;
}

public CustomScrollView(Context context) {
    super(context);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            // if we can scroll pass the event to the superclass
            if (mScrollable) return super.onTouchEvent(ev);
            // only continue to handle the touch event if scrolling enabled
            return mScrollable; // mScrollable is always false at this point
        default:
            return super.onTouchEvent(ev);
    }
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    // Don't do anything with intercepted touch events if
    // we are not scrollable
    if (!mScrollable) return false;
    else return super.onInterceptTouchEvent(ev);
}}

然后在你的 xml:

<your.package.name.CustomScrollView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            Android: scrollbars="vertical">
   <!--whatever widgets you want to add-->
</your.package.name.CustomScrollView>

在你的activity中：

buttomRecord.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN){
            scrollView.setScrollingEnabled(false);
            startRecording();
            return true;
        }
        else if(event.getAction() == MotionEvent.ACTION_UP){
            stopRecording();
            return true;
        }
        return false;
    }
});

Android - 按住按钮时禁止滚动

Android - Disable scrolling while holding button

android-button

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android-scrollview

motionevent