我在 viewSwitcher 中有 2 个布局,我需要在滑动时进行更改。
package slide.trys.one;
import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.widget.ViewSwitcher;
public class SlideActivity extends Activity implements OnGestureListener {
private ViewSwitcher switcher;
private GestureDetector gesturedetector = null;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    gesturedetector = new GestureDetector(this, this);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
        return gesturedetector.onTouchEvent(event);
}
int SWIPE_MIN_VELOCITY = 100;
int SWIPE_MIN_DISTANCE = 100;
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {
    float ev1X = e1.getX();
    float ev2X = e2.getX();
    final float xdistance = Math.abs(ev1X - ev2X);
    final float xvelocity = Math.abs(velocityX);
    if( (xvelocity > SWIPE_MIN_VELOCITY) && (xdistance > SWIPE_MIN_DISTANCE) )
    {
        if(ev1X > ev2X)
        {
            switcher.showNext(); //Error in this part
        }
        else
        {
            switcher.showPrevious(); //Error in this part
        }
    }
    return false;
}
public void onLongPress(MotionEvent e) {
}
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {
    return false;
}
public void onShowPress(MotionEvent e) {
}
public boolean onSingleTapUp(MotionEvent e) {
    return false;
}
public boolean onDown(MotionEvent e) {
    return false;
}
}
我也是java和Android的新手。请帮助我,我在哪里做错了?我得到错误switcher.showNext()和switcher.showPrevious()。
请帮忙。我的例子是使用 android 4.0.3,但我需要在 2.1 上工作。我不知道如何解决这个问题。
viewSwitcher 可以在 Android 2.1 上运行吗?
我的 XML 文件。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
<ViewSwitcher
    android:id="@+id/viewSwitcher"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:inAnimation="@anim/in_animation"
    android:outAnimation="@anim/out_animation" >
    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
        <ImageView
            android:id="@+id/imageView2"
            android:contentDescription="@string/app_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/footer" />
    </RelativeLayout>
    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
        <ImageView
           android:id="@+id/imageView1"
           android:contentDescription="@string/app_name"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:src="@drawable/blue_header" />
    </RelativeLayout>        
    </ViewSwitcher>
</LinearLayout>