android 选项卡小部件内列表视图中的滑动事件

Question

我创建了一个显示列表视图的活动，并且在滑动操作时使用 ViewFlipper 显示另一个列表。代码附在下面：

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.ViewFlipper;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity {
    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 GestureDetector gestureDetector;
    View.OnTouchListener gestureListener;
    private Animation slideLeftIn;
    private Animation slideLeftOut;
    private Animation slideRightIn;
    private Animation slideRightOut;
    private ViewFlipper viewFlipper;
    private ListView lv;
    private String[] city = { "Indore", "Bhopal", "Khargone", "Ujjain",
        "Nasik", "Pune", "Delhi", "Mumbai", "Noida", "Hyderabad",
        "Banglore", "Ajmer", "Goa", "Jaipur", "Nagpur", "" };
    private String[] country = { "India", "Bhutan", "Kuwait", "USA", };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);
        lv = (ListView) findViewById(R.id.List01);
        ListView lv2 = (ListView) findViewById(R.id.List02);

        viewFlipper = (ViewFlipper) findViewById(R.id.flipper);
        slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.slide_left_in);
        slideLeftOut = AnimationUtils
                .loadAnimation(this, R.anim.slide_left_out);
        slideRightIn = AnimationUtils
                .loadAnimation(this, R.anim.slide_right_in);
        slideRightOut = AnimationUtils.loadAnimation(this,
                R.anim.slide_right_out);

        gestureDetector = new GestureDetector(new MyGestureDetector());
        gestureListener = new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
                if (gestureDetector.onTouchEvent(event)) {
                    return true;
                }
                return false;
            }
        };
        lv.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, city));
        lv2.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, country));
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView arg0, View view, int position,
                    long id) {
                // user clicked a list item, make it "selected"
                Toast.makeText(getBaseContext(), "Item Clicked",
                        Toast.LENGTH_SHORT).show();
                // selectedAdapter.setSelectedPosition(position);
            }
        });
        lv2.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView arg0, View view, int position,
                    long id) {
                // user clicked a list item, make it "selected"
                Toast.makeText(getBaseContext(), "Item List2 Clicked",
                        Toast.LENGTH_SHORT).show();
                // selectedAdapter.setSelectedPosition(position);
            }
        });
    }

    class MyGestureDetector extends SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
            try {
                if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                    return false;
                // right to left swipe
                if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                        && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    viewFlipper.setInAnimation(slideLeftIn);
                    viewFlipper.setOutAnimation(slideLeftOut);
                    viewFlipper.showNext();
                } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                        && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    viewFlipper.setInAnimation(slideRightIn);
                    viewFlipper.setOutAnimation(slideRightOut);
                    viewFlipper.showPrevious();
                }
            } catch (Exception e) {
                // nothing
            }
            return false;
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (gestureDetector.onTouchEvent(event))
            return true;
        else
            return false;
    }
}

它正在工作 f9...

但是当我使用以下代码将其放置在另一个选项卡活动中当将其作为内容（意图）放置在另一个选项卡活动（AppStart）的选项卡中时，视图翻转器不起作用

import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.TabHost;

public class AppStart extends TabActivity {
    /** Called when the activity is first created. */
    static Drawable myImage;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Resources res = getResources();
        myImage = res.getDrawable(R.drawable.club);

        TabHost tabs = getTabHost();
        tabs.setup();
        TabHost.TabSpec spec = tabs.newTabSpec(null);

                Intent i = new Intent().setClass(this, MainActivity.class);
                spec = tabs.newTabSpec(null);
        spec.setContent(i);
        spec.setIndicator("Tab");
        tabs.addTab(spec);

    }

}

布局如下： main_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<ViewFlipper xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/flipper" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <ListView android:layout_width="fill_parent"
            android:layout_height="fill_parent" android:id="@+id/List01"/>
    </LinearLayout>

    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <ListView  android:layout_width="fill_parent"
            android:layout_height="fill_parent" 
            android:id="@+id/List02" />
    </LinearLayout>

</ViewFlipper>

和 main.xml 如下所示：

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout android:orientation="vertical"
        android:layout_width="fill_parent" android:layout_height="fill_parent">
        <TabWidget android:id="@android:id/tabs"
            android:layout_width="fill_parent" android:layout_height="wrap_content" />
        <FrameLayout android:id="@android:id/tabcontent"
            android:layout_width="fill_parent" android:layout_height="fill_parent">


        </FrameLayout>
    </LinearLayout>
</TabHost>

请提出为什么当相同的活动放置在选项卡中时滑动手势不起作用。

谢谢

Answer 1

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.ViewFlipper;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity {

    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 GestureDetector gestureDetector;
    View.OnTouchListener gestureListener;

    private Animation slideLeftIn;
    private Animation slideLeftOut;

    private Animation slideRightIn;
    private Animation slideRightOut;
    private ViewFlipper viewFlipper;
    private ListView lv;

    private String[] city = {
        "Indore", "Bhopal", "Khargone", "Ujjain",
            "Nasik", "Pune", "Delhi", "Mumbai", "Noida", "Hyderabad",
            "Banglore", "Ajmer", "Goa", "Jaipur", "Nagpur", ""
    };

    private String[] country = {
        "India", "Bhutan", "Kuwait", "USA",
    };


    @
    Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);
        lv = (ListView) findViewById(R.id.List01);
        ListView lv2 = (ListView) findViewById(R.id.List02);

        viewFlipper = (ViewFlipper) findViewById(R.id.flipper);
        slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.slide_left_in);
        slideLeftOut = AnimationUtils
            .loadAnimation(this, R.anim.slide_left_out);
        slideRightIn = AnimationUtils
            .loadAnimation(this, R.anim.slide_right_in);
        slideRightOut = AnimationUtils.loadAnimation(this,
            R.anim.slide_right_out);

        ActivitySwipeDetector activitySwipeDetector = new ActivitySwipeDetector(
            this);

        //View on which gesture should function This is image view at bottom of listView on which flip gesture is performed.

        flipBarBottom.setOnTouchListener(activitySwipeDetector);

        lv.setAdapter(new ArrayAdapter < String > (this,
            android.R.layout.simple_list_item_1, city));
        lv2.setAdapter(new ArrayAdapter < String > (this,
            android.R.layout.simple_list_item_1, country));
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView arg0, View view, int position,
                long id) {
                // user clicked a list item, make it "selected"
                Toast.makeText(getBaseContext(), "Item Clicked",
                    Toast.LENGTH_SHORT).show();
                // selectedAdapter.setSelectedPosition(position);
            }
        });

        lv2.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView arg0, View view, int position,
                long id) {
                // user clicked a list item, make it "selected"
                Toast.makeText(getBaseContext(), "Item List2 Clicked",
                    Toast.LENGTH_SHORT).show();
                // selectedAdapter.setSelectedPosition(position);
            }
        });
    }

    public class ActivitySwipeDetector implements View.OnTouchListener {

        static final String logTag = "ActivitySwipeDetector";
        private Activity activity;
        static final int MIN_DISTANCE = 100;
        private float downX, downY, upX, upY;

        public ActivitySwipeDetector(Activity activity) {
            this.activity = activity;
        }

        public void onRightToLeftSwipe() {
            Log.i(logTag, "RightToLeftSwipe!");
            // activity.doSomething();
            viewFlipper.setInAnimation(slideLeftIn);
            viewFlipper.setOutAnimation(slideLeftOut);
            viewFlipper.showNext();
            flipBarBottom.setBackgroundResource(R.drawable.flipstatus01);
        }

        public void onLeftToRightSwipe() {
            Log.i(logTag, "LeftToRightSwipe!");
            viewFlipper.setInAnimation(slideRightIn);
            viewFlipper.setOutAnimation(slideRightOut);
            viewFlipper.showPrevious();
            flipBarBottom.setBackgroundResource(R.drawable.flipstatus02);
            // activity.doSomething();
        }

        public void onTopToBottomSwipe() {
            Log.i(logTag, "onTopToBottomSwipe!");
            // activity.doSomething();
        }

        public void onBottomToTopSwipe() {
            Log.i(logTag, "onBottomToTopSwipe!");
            // activity.doSomething();
        }

        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                {
                    downX = event.getX();
                    downY = event.getY();
                    return true;
                }
            case MotionEvent.ACTION_UP:
                {
                    upX = event.getX();
                    upY = event.getY();

                    float deltaX = downX - upX;
                    float deltaY = downY - upY;

                    // swipe horizontal?
                    if (Math.abs(deltaX) > MIN_DISTANCE) {
                        // left or right
                        if (deltaX < 0) {
                            this.onLeftToRightSwipe();
                            return true;
                        }
                        if (deltaX > 0) {
                            this.onRightToLeftSwipe();
                            return true;
                        }
                    } else {
                        Log.i(logTag, "Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
                    }
                    // swipe vertical?
                    if (Math.abs(deltaY) > MIN_DISTANCE) {
                        // top or down
                        if (deltaY < 0) {
                            this.onTopToBottomSwipe();
                            return true;
                        }
                        if (deltaY > 0) {
                            this.onBottomToTopSwipe();
                            return true;
                        }
                    } else {
                        Log.i(logTag, "Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
                    }

                    return true;
                }
            }
            return false;
        }

    }