问题
I have a ViewFlipper which should react to a fling gesture, but it does not.
Activity
@Override
public void onCreate(Bundle savedInstanceState) {
...
listView = this.getListView();
detector = new GestureDetector(this, new FlingGestureListener(listView));
...
}
FlingGestureListener
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
int pos = source.pointToPosition(Math.round(e1.getX()), Math.round(e1.getY()));
View v = source.getChildAt(pos - source.getFirstVisiblePosition());
System.out.println("fling: x=" + velocityX + " y=" + velocityY);
try {
IFlingable flingable = (IFlingable) v;
if(velocityY > -200 && velocityY < 200) {
if(velocityX < 0)
flingable.fling(IFlingable.RIGHT_TO_LEFT);
else if(velocityX > 0)
flingable.fling(IFlingable.LEFT_TO_RIGHT);
}
} catch(Exception e) {}
return false;
}
View with ViewFlipper which implements IFlingable
public void fling(int direction) {
System.out.println("flip: " + direction);
switch(direction) {
case IFlingable.LEFT_TO_RIGHT:
System.out.println("piep");
GUIHelper.setAnimationSlideLeftToRight(context, switcher);
switcher.showNext();
break;
case IFlingable.RIGHT_TO_LEFT:
System.out.println("pup");
GUIHelper.setAnimationSlideRightToLeft(context, switcher);
switcher.showPrevious();
break;
}
}
Layout
<ViewFlipper android:id="@+id/viewSwitcher"
android:layout_height="wrap_content"
android:layout_width="match_parent" android:layout_weight="1"
android:inAnimation="@anim/slide_in_left"
android:outAnimation="@anim/slide_out_right">
<LinearLayout android:layout_height="wrap_content"
android:layout_width="match_parent" android:orientation="vertical">
...
</LinearLayout>
...
</ViewFlipper>
Log
fling: x=2542.3613 y=95.877945
flip: 0
piep
I get the right log messages so the showNext() on the ViewFlipper gets executed but it does not change its view on the gui. Am I missing something? I have another layout with a ViewSwitcher instead of the Flipper and that one works.
EDIT:
Here are the missing classes:
public class GUIHelper {
...
public static void setAnimationSlideLeftToRight(Context context, ViewAnimator switcher) {
Animation in = AnimationUtils.loadAnimation(context, R.anim.slide_in_left);
Animation out = AnimationUtils.loadAnimation(context, R.anim.slide_out_right);
switcher.setInAnimation(in);
switcher.setOutAnimation(out);
}
public static void setAnimationSlideRightToLeft(Context context, ViewAnimator switcher) {
Animation in = AnimationUtils.loadAnimation(context, R.anim.slide_in_right);
Animation out = AnimationUtils.loadAnimation(context, R.anim.slide_out_left);
switcher.setInAnimation(in);
switcher.setOutAnimation(out);
}
...
}
public interface IFlingable {
public static final int LEFT_TO_RIGHT = 0;
public static final int RIGHT_TO_LEFT = 1;
public void fling(int direction, boolean fling);
}
回答1:
Hello this is the running swipe code on listView just as your xml I have placed a ListView with parent LinearLayout in ViewFlipper
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;
}
}
Included the layout(main_layout) that is used.....
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Do not Click Just swipe on remaining area" />
</LinearLayout>
<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:id="@+id/ViewFlipper01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/List01"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
回答2:
This is my xml code used.
<ViewFlipper
android:id="@+id/vf"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<ListView
android:id="@+id/list1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
></ListView>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<ListView
android:id="@+id/list2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
></ListView>
</LinearLayout>
</ViewFlipper>
Override dispatchTouchEvent instead of onTouchEvent
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
super.dispatchTouchEvent(event);
return gestureDetector.onTouchEvent(event);
}
This works fine :) Scroll View and flipper both works fine.
来源：https://stackoverflow.com/questions/5563749/android-viewflipper-not-flipping