我想使用 viewSwitcher 在两种布局之间切换。它可以使用按钮，但我想通过触摸屏幕进行切换。我找到了一个 onTouchListener 示例，我试图实现某种类似的，但我没能做到。
在我的 main.xml 中，我得到了一个包含 ViewSwitcher 和另外两个 LinearLayout 的线性布局。这些是我想要切换的布局。
这里是：
<ViewSwitcher
android:id="@+id/viewSwitcher"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inAnimation="@android:anim/slide_in_left"
android:outAnimation="@android:anim/slide_out_right" >
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/firstlayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg"
android:orientation="vertical" >
<ImageView
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/titlebar" />
<Button
android:id="@+id/somebut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="30px"
android:background="@drawable/but" />
</LinearLayout>
<LinearLayout
android:id="@+id/secondlayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Second layout" >
</TextView>
</LinearLayout>
</ViewSwitcher>
和我的代码：
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.LinearLayout;
import android.widget.ViewSwitcher;
public class SwitcherActivity extends Activity {
private float downXValue;
private View firstView;
private View SecondView;
private ViewSwitcher vs;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
vs = (ViewSwitcher)findViewById(R.id.viewSwitcher);
firstView= findViewById(R.id.firstlayout);
secondView = findViewById(R.id.secondlayout);
LinearLayout first = (LinearLayout) findViewById(R.id.firstlayout);
first.setOnTouchListener((OnTouchListener) this);
}
public boolean onTouch(View arg0, MotionEvent arg1) {
switch (arg1.getAction()){
case MotionEvent.ACTION_DOWN:{
// store the X value when the user's finger was pressed down
downXValue = arg1.getX();
break;
}
case MotionEvent.ACTION_UP:{
// Get the X value when the user released his/her finger
float currentX = arg1.getX();
// going backwards: pushing stuff to the right
if (downXValue < currentX)
{
if (vs.getCurrentView() != myFirstView)vs.showPrevious();
}
// going forwards: pushing stuff to the left
if (downXValue > currentX)
{
if (vs.getCurrentView() != mySecondView)
vs.showNext();
}
break;
}
}
return true;
}
}
我的问题是，我在包含以下内容的行中得到了 ClassCastException：
first.setOnTouchListener((OnTouchListener) this);