prebuilts/gradle/BasicGestureDetect/BasicGestureDetectSample/src/main/java/com/example/android/basicgesturedetect/BasicGestureDetectFragment.java

/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.example.android.basicgesturedetect;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.GestureDetector;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;

import com.example.android.common.logger.Log;
import com.example.android.common.logger.LogFragment;

public class BasicGestureDetectFragment extends Fragment{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        View gestureView = getActivity().findViewById(R.id.sample_output);
        gestureView.setClickable(true);
        gestureView.setFocusable(true);

        // BEGIN_INCLUDE(init_detector)

        // First create the GestureListener that will include all our callbacks.
        // Then create the GestureDetector, which takes that listener as an argument.
        GestureDetector.SimpleOnGestureListener gestureListener = new GestureListener();
        final GestureDetector gd = new GestureDetector(getActivity(), gestureListener);

        /* For the view where gestures will occur, create an onTouchListener that sends
         * all motion events to the gesture detector.  When the gesture detector
         * actually detects an event, it will use the callbacks you created in the
         * SimpleOnGestureListener to alert your application.
        */

        gestureView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                gd.onTouchEvent(motionEvent);
                return false;
            }
        });
        // END_INCLUDE(init_detector)
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.sample_action) {
            clearLog();
        }
        return true;
    }

    public void clearLog() {
        LogFragment logFragment =  ((LogFragment) getActivity().getSupportFragmentManager()
                .findFragmentById(R.id.log_fragment));
        logFragment.getLogView().setText("");
    }
}