error while tapping image
I've got strange problem with my ViewFlipper. It's working perfectly, besides one particular situation. When I open my activity for the first time and tap first image instead of slide it, application shows error. But when I slide it it's works fine and shows next image. After this, when I go backwards to first image and tap it again, it's working good.
My java code:
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.widget.ViewFlipper;
public class MyActivity extends Activity {
ViewFlipper my_flipper;
private float lastX;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_activity);
my_flipper = (ViewFlipper) findViewById(R.id.my_flipper);
showImages();
}
public void showImages () {
my_flipper.setDisplayedChild(0);
my_flipper.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
lastX = motionEvent.getX();
return true;
case MotionEvent.ACTION_UP:
float currentX = motionEvent.getX();
if (lastX < currentX) {
if (my_flipper.getDisplayedChild() == 0)
break;
my_flipper.setInAnimation(getApplication(), R.anim.slide_in_from_left);
my_flipper.setOutAnimation(getApplication(), R.anim.slide_out_to_right);
my_flipper.showNext();
}
if (lastX > currentX) {
if (my_flipper.getDisplayedChild() == 1) {
break;
}
my_flipper.setInAnimation(getApplication(), R.anim.slide_in_from_right);
my_flipper.setOutAnimation(getApplication(), R.anim.slide_out_to_left);
my_flipper.showPrevious();
}
my_flipper.getOutAnimation().setAnimationListener(new Animation.AnimationListener() {
public void onAnimationStart(Animation animation) {
}
public void onAnimationRepeat(Animation animation) {
}
public void onAnimationEnd(Animation animation) {
}
});
}
return true;
}
});
}
}
and XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="#0f4b75"
tools:context=".MyActivity">
<ViewFlipper
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/my_flipper"
android:background="#000000"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/atrakcja_0"
android:adjustViewBounds="true"
android:src="@drawable/foto"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/atrakcja_1"
android:adjustViewBounds="true"
android:src="@drawable/foto"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/atrakcja_2"
android:adjustViewBounds="true"
android:src="@drawable/foto"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/atrakcja_3"
android:adjustViewBounds="true"
android:src="@drawable/foto"
/>
</ViewFlipper>
</RelativeLayout>
one of animation example:
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<translate
android:fromXDelta="-100%" android:toXDelta="0%"
android:fromYDelta="0%" android:toYDelta="0%"
android:duration="140" />
</set>
and finally logs:
W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41ed5e00) E/AndroidRuntime: FATAL EXCEPTION: main Process: android.dedykowani_narciarze, PID: 26403 java.lang.NullPointerException at android.dedykowani_narciarze.MyActivity$1.onTouch(MyActivity.java:51) at android.view.View.dispatchTouchEvent(View.java:7729) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2212) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2218) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2218) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2218) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2218) at android.view.Vie wGroup.dispatchTouchEvent(ViewGroup.java:1959) at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2093) at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1540) at android.app.Activity.dispatchTouchEvent(Activity.java:2500) at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2041) at android.view.View.dispatchPointerEvent(View.java:7914) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4165) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4044) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3556) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3606) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3575) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3682) at android.view.ViewRootImpl$InputStage.apply(ViewR ootImpl.java:3583) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3739) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3556) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3606) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3575) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3583) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3556) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5750) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5730) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5701) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5830) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) at android.os.MessageQueue.nativePollOnce(Native Method) at android.os.MessageQueue.next(MessageQueue.java:138) at android.os.Looper.loop(Looper.java: 123) at android.app.ActivityThread.main(ActivityThread.java:5333) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:895) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:711) at dalvik.system.NativeStart.main(Native Method)
This line produces error:
my_flipper.getOutAnimation().setAnimationListener(new Animation.AnimationListener() {
I will be grateful for any help you can provide.
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