Android中的垂直滚动和水平滑动

Question

我正在尝试使用 OnGestureListener 在 Android 中滑动。如果文本超出布局高度，我需要垂直滚动。我需要垂直滚动和水平滑动应该一起工作。代码是：

package com.example.gestures;


import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.Menu;
import android.view.MotionEvent;
import android.widget.TextView;
import android.widget.Toast;

public class Gestures extends Activity implements OnGestureListener {
GestureDetector gDetector;TextView tv;
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private static final int SWIPE_THRESHOLD = 100;
private static final int SWIPE_VELOCITY_THRESHOLD = 100;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gestures);
        gDetector = new GestureDetector(this);
        tv=(TextView)findViewById(R.id.tv);

    }







    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.gestures, menu);
        return true;
    }

    @Override
    public boolean onDown(MotionEvent arg0) {
        // TODO Auto-generated method stub
        Log.d("onDown","In OnDown");
        return true;

    }



    public void rightToLeft() {

        //tv.setText("There are subclasses of LayoutParams for different subclasses of ViewGroup. For example, AbsoluteLayout has its own subclass of LayoutParams which adds an X and Y value.");
    tv.setText("ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssALGIERS (Reuters) - Algerian President Abdelaziz Bouteflika, who suffered a stroke last year, has been in a Paris hospital since Monday for a long-planned check-up and he is making steady progress, the state news agency APS said on Tuesday.Algerians vote for a new president in April. Bouteflika, 76, has yet to announce whether he will run again after more than 10 years at the helm of the major North African oil producer.To complete his health assessment, started in Algiers, and under a routine medical control ... planned since June 2013, the President of the Republic Abdelaziz Bouteflika is staying at Val-de-Grace hospital, it said. The president's health is improving certainly and progressively.APS, citing a presidential statement, said Bouteflika would remain at the hospital until Friday.A veteran of Algeria's independence war against France, Bouteflika suffered a stroke in early 2013, forcing him to be rushed to hospital in France. He returned to Algeria in July to convalesce and has made only a few public appearances recently.");
    }
    public void lefttoRight() {
        tv.setText("leftToRight LayoutParams are used by views to tell their parents how they want to be laid out. See ViewGroup Layout Attributes for a list of all child view attributes that this class supports. ");
        }

    @Override
    public boolean onFling(MotionEvent start, MotionEvent finish, float velocityX,
            float velocityY) {
        // TODO Auto-generated method stub
        //TextView t=(TextView)findViewById(R.id.tv);
        /*if(start.getRawX() < finish.getRawX())
        {
            Log.d("onFling","in inFling");
        }
        else if(start.getRawX()>finish.getRawX())
        {
            Log.d("onFLing","in onFling");
        }*/
        if (Math.abs(start.getY() - finish.getY()) > SWIPE_MAX_OFF_PATH)
            return false;
        // right to left swipe

        if(start.getX() - finish.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

        lefttoRight();

        }  
        else if (finish.getX() - start.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
     rightToLeft();
        }
        return true;
    }


    @Override
    public boolean onTouchEvent(MotionEvent me) {
    return gDetector.onTouchEvent(me);
    }

    @Override
    public void onLongPress(MotionEvent arg0) {
        // TODO Auto-generated method stub
        Log.d("onLongPress","in onlongpress");
    }



    @Override
    public void onShowPress(MotionEvent arg0) {
        // TODO Auto-generated method stub
        Log.d("onShowPress","in onShowPress");

    }

    @Override
    public boolean onSingleTapUp(MotionEvent arg0) {
        // TODO Auto-generated method stub
        Log.d("onSingleTapup","in onsingletapup");
        return true;
    }

    @Override
    public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,
            float arg3) {
        // TODO Auto-generated method stub
        return false;
    }

}

还有xml文件（activity_gestures.xml）：

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".Gestures" >



    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >


        <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
        </LinearLayout>

    </ScrollView>

</RelativeLayout>

问题是有时滚动工作正常，滑动工作不正常。请让我知道如何解决此问题。提前致谢。

Answer 1

通过扩展创建自定义 ScrollView 并实现 dispatchTouchEvent。

我们开始跟踪ACTION_DOWN 中的触摸（屏幕上的像素位置）。当我们看到它是水平滑动时，我们不调用 super.dispatchTouchEvent( event ) - 这将执行默认的 onTouch 路由并使某些子视图也消耗水平滑动 - 但在 ACTION_MOVE 和 @987654325 中调用 onTouchEvent( event ) @。

public class MyScrollView extends ScrollView {

    private float mLastX;
    private float mLastY;
    private final int mTouchSlop = ViewConfiguration.get( getContext() ).getScaledTouchSlop();
    private float mStartX;

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

    public ScrollView( Context context, AttributeSet attrs ) {
        super( context, attrs );
    }

  @Override
  public boolean dispatchTouchEvent( MotionEvent event ) {
    switch( event.getAction() ) {
        case MotionEvent.ACTION_DOWN:
            mLastX = event.getX();
            mLastY = event.getY();
            mStartX = event.getX();
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            onTouchEvent( event );
            break;
        case MotionEvent.ACTION_MOVE:
            float x = event.getX();
            float y = event.getY();

            float xDelta = x - mLastX;
            float xDeltaAbs = Math.abs( xDelta );
            float yDeltaAbs = Math.abs( y - mLastY );

            float xDeltaTotal = x - mStartX;
            if( Math.abs( xDeltaTotal ) > mTouchSlop )
                if( xDeltaAbs > yDeltaAbs )
                    return onTouchEvent( event );
        }

        return super.dispatchTouchEvent( event );
    }
}

我只用 ViewPager 而不是 ScrollVIew 尝试过这个，但在同样的情况下，这应该可以工作