Android - Gesture Detection (Swipe up/down) on par

问题:

I am trying to implement the OnGestureListener in Android.
I have three TextViews in my layout.
What i am trying to achieve is to set Gesture Listener for two of the textViews .
Here is the layout -

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rlMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView
    android:id="@+id/tvOne"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="5dp"
    android:gravity="center"
    android:text="One" />

<TextView
    android:id="@+id/tvTwo"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/tvOne"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="5dp"
    android:gravity="center"
    android:text="Two" />

<TextView
    android:id="@+id/tvThree"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/tvTwo"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="5dp"
    android:gravity="center"
    android:text="Three" />

And here is the activity -

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;

public class TimeActivity extends Activity implements OnGestureListener {

GestureDetector gestureScanner;

@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.wheelview);
    gestureScanner = new GestureDetector(this);

}

@Override
public boolean onTouchEvent(MotionEvent event) {
    // TODO Auto-generated method stub
    return gestureScanner.onTouchEvent(event);
}

@Override
public boolean onDown(MotionEvent e) {
    // TODO Auto-generated method stub
    return true;
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {
    // TODO Auto-generated method stub
    Log.i("Test", "On Fling");
    return true;
}

@Override
public void onLongPress(MotionEvent e) {
    // TODO Auto-generated method stub

}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
        float distanceY) {
    // TODO Auto-generated method stub
    return false;
}

@Override
public void onShowPress(MotionEvent e) {
    // TODO Auto-generated method stub

}

@Override
public boolean onSingleTapUp(MotionEvent e) {
    // TODO Auto-generated method stub
    return false;
}

}

At present Fling for all the three textviews is getting called .
Is there any way through which i can set the Gesture Listener for some particular views in the layout.
Any help will be highly appreciated.

回答1:

Do this in your onCreate method.

findViewById(R.id.tvOne).setOnTouchListener(new View.OnTouchListener() { 
            @Override
           public boolean onTouch(View v, MotionEvent event){
                return gestureScanner.onTouchEvent(event);
           }
  });

回答2:

You can set OnTouchListeners to individual TextViews.

findViewById(R.id.tvOne).setOnTouchListener(new OnTouchListener() {

    @Override
    public boolean onTouch(View view, MotionEvent event) {
         // Your code here
    }
}

回答3:

A suggestion

If you don't want to detect all gesture,try this class: SimpleGestureListener created by myself.

Now here are some snippets for this class's usage.

Usage

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    private GestureDetector mDetector;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        SimpleGestureListener simpleGestureListener = new SimpleGestureListener();
        simpleGestureListener.setListener(new SimpleGestureListener.Listener() {
            @Override
            public void onScrollHorizontal(float dx) {
                Log.i(TAG,"horizontal = " +dx);
            }

            @Override
            public void onScrollVertical(float dy) {
                Log.i(TAG,"vertical = " +dy);
            }
        });
        mDetector = new GestureDetector(this, simpleGestureListener);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mDetector.onTouchEvent(event);
        return super.onTouchEvent(event);
    }
}

It can be used for detecting swiping gesture :

• left or right
• up or down