我正在设计一个需要将平板电脑分成三个单独屏幕的应用程序，如下所示。每个屏幕上都会有一张图片，当你垂直滑动这张图片时，它会带你到下一张图片。我已经使用 Fragments 来做到这一点，到目前为止，我已经成功创建了 3 个 Fragments，它们显示在一个屏幕上，如下所示.每个片段都响应向上或向下滑动。我使用 viewflipper 和动画在图像之间滑动。但是，当我将此代码添加到我的应用程序时，它会导致它崩溃。我在我的 logcat 中得到一个膨胀异常，如下所示：
01-08 15:52:05.870: E/AndroidRuntime(4061): FATAL EXCEPTION: main
01-08 15:52:05.870: E/AndroidRuntime(4061): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.david.fragmenttest/com.david.fragmenttest.MainFragment}: android.view.InflateException: Binary XML file line #13: Error inflating class fragment
代码本身可以正常工作，但是当我将它添加到我的片段类时，我得到了上述错误。有谁知道是否可以在片段类中使用 viewflipper 和动画？我可能以错误的方式接近这个吗？谢谢
主类：
public class Main extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
主.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<fragment
android:id="@+id/imOne"
android:name="com.david.ImageOne"
android:layout_width="400dp"
android:layout_height="fill_parent" />
<fragment
android:id="@+id/imTwo"
android:name="com.david.ImageTwo"
android:layout_width="400dp"
android:layout_height="fill_parent" />
<fragment
android:id="@+id/imThree"
android:name="com.david.ImageThree"
android:layout_width="400dp"
android:layout_height="fill_parent" />
</LinearLayout>
片段 A 的类
public class ImageTwo extends Fragment {
private ViewFlipper mViewFlipper;
private int mSpeed;
private int mCount;
private int mFactor;
private boolean mAnimating;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.pic_two, container, false);
mViewFlipper = (ViewFlipper) getView().findViewById(R.id.view_flipper);
mAnimating = false;
mCount = 0;
mSpeed = 0;
final GestureDetector gesture = new GestureDetector(getActivity(),
new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
return true;
}
private Runnable r1 = new Runnable() {
@Override
public void run() {
up();
if (mCount < 1) {
mAnimating = false;
} else {
Handler h = new Handler();
h.postDelayed(r1, mSpeed);
}
}
};
private Runnable r2 = new Runnable() {
@Override
public void run() {
down();
if (mCount < 1) {
mAnimating = false;
} else {
Handler h = new Handler();
h.postDelayed(r2, mSpeed);
}
}
};
@Override
public boolean onFling(MotionEvent start,
MotionEvent finish, float xVelocity, float yVelocity) {
try {
if (mAnimating)
return true;
mAnimating = true;
mCount = (int) Math.abs(yVelocity) / 900;
mFactor = (int) 300 / mCount;
mSpeed = mFactor;
if (yVelocity > 0) {
// down
Handler h = new Handler();
h.postDelayed(r2, mSpeed);
} else {
// up
Handler h = new Handler();
h.postDelayed(r1, mSpeed);
}
// ((TextView)findViewById(R.id.velocity)).setText("VELOCITY => "+Float.toString(yVelocity));
} catch (ArithmeticException e) {
// swiped too slow doesn't register
mAnimating = false;
}
return true;
}
private void up() {
mCount--;
mSpeed += mFactor;
Animation inFromBottom = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
inFromBottom
.setInterpolator(new AccelerateInterpolator());
inFromBottom.setDuration(mSpeed);
Animation outToTop = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, -1.0f);
outToTop.setInterpolator(new AccelerateInterpolator());
outToTop.setDuration(mSpeed);
mViewFlipper.clearAnimation();
mViewFlipper.setInAnimation(inFromBottom);
mViewFlipper.setOutAnimation(outToTop);
if (mViewFlipper.getDisplayedChild() == 0) {
mViewFlipper.setDisplayedChild(2);
} else {
mViewFlipper.showPrevious();
}
}
private void down() {
mCount--;
mSpeed += mFactor;
Animation outToBottom = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 1.0f);
outToBottom
.setInterpolator(new AccelerateInterpolator());
outToBottom.setDuration(mSpeed);
Animation inFromTop = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, -1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
inFromTop.setInterpolator(new AccelerateInterpolator());
inFromTop.setDuration(mSpeed);
mViewFlipper.clearAnimation();
mViewFlipper.setInAnimation(inFromTop);
mViewFlipper.setOutAnimation(outToBottom);
if (mViewFlipper.getDisplayedChild() == 0) {
mViewFlipper.setDisplayedChild(2);
} else {
mViewFlipper.showPrevious();
}
}
@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;
}
});
view.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return gesture.onTouchEvent(event);
}
});
return view;
}
}
片段布局 - pic_one.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/bus_1" />
</LinearLayout>