如何防止ViewFlipper循环
问题描述:
我正在开发一个应用程序,我在其中使用ViewFlipper
自定义OnTouch
实现。在ViewFlipper
中,我有大约20张图片供用户翻阅。这工作正常,但如果我在系列中的第20张图像并翻转屏幕,它会返回到第一张图像。如何防止ViewFlipper循环
我想阻止ViewFlipper
循环回第一个图像。相反,它应该停留在最后一张图片上。
这里是我的代码:
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.animation.AnimationUtils;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.ViewFlipper;
public class Activity1 extends Activity implements OnTouchListener{
float downXValue;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set main.XML as the layout for this Activity
setContentView(R.layout.main);
// Add these two lines
LinearLayout layMain = (LinearLayout) findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener) this);
// Add a few countries to the spinner
Spinner spinnerCountries = (Spinner) findViewById(R.id.spinner_country);
ArrayAdapter countryArrayAdapter = new ArrayAdapter(this,
android.R.layout.simple_spinner_dropdown_item,
new String[] { "Canada", "USA" });
spinnerCountries.setAdapter(countryArrayAdapter);
}
public boolean onTouch(View arg0, MotionEvent arg1) {
// Get the action that was done on this touch event
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)
{
// Get a reference to the ViewFlipper
ViewFlipper vf = (ViewFlipper) findViewById(R.id.details);
// Set the animation
vf.setAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));
// Flip!
vf.showPrevious();
}
// going forwards: pushing stuff to the left
if (downXValue > currentX)
{
// Get a reference to the ViewFlipper
ViewFlipper vf = (ViewFlipper) findViewById(R.id.details);
// Set the animation
vf.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));
// Flip!
vf.showNext();
}
break;
}
}
// if you return false, these actions will not be recorded
return true;
}
}
和XML布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/layout_main"
>
<ViewFlipper android:id="@+id/details"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/two"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/three"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/four"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/five"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/six"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/seven"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/eight"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<ViewFlipper>
</LinearLayout>
答
你知道,有20名孩子在viewflipper。因此,请在onclick中检查if语句,以检查getDisplayedChild()
是否低于20.如果它是20或更高,则不要致电showNext()
。
答
我通过定制ViewFlipper
public class ExViewFlipper extends ViewFlipper { private OnChangeViewListener mOnChangeViewListener; public ExViewFlipper(Context context) { super(context); } public ExViewFlipper(Context context, AttributeSet attrs) { super(context, attrs); } public interface OnChangeViewListener { /** * call on Change view * * @param index next index * @param hasNext true if next view is exist */ void onChange(int index, boolean hasNext); } public void setOnChangeViewListener(OnChangeViewListener listener) { mOnChangeViewListener = listener; } @Override public void showNext() { super.showNext(); if (mOnChangeViewListener != null) { mOnChangeViewListener.onChange(getDisplayedChild(), true); } } @Override public void showPrevious() { super.showPrevious(); if (mOnChangeViewListener != null) { mOnChangeViewListener.onChange(getDisplayedChild(), false); } } public boolean isFirstItem() { return getDisplayedChild() == 0; } public boolean isLastItem() { return getDisplayedChild() == getChildCount() - 1; }
答
在Viewflipper设置一个AnimationListener检测儿童的末尾,然后停止动画当你到达最后一张幻灯片。
viewFlipper = (ViewFlipper) findViewById(R.id.viewFlipperMain);
viewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,R.anim.slide_in_right));
viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.slide_out_left));
AnimationListener mAnimationListener = new Animation.AnimationListener() {
public void onAnimationStart(Animation animation) {
//animation started event
}
public void onAnimationRepeat(Animation animation) {
}
public void onAnimationEnd(Animation animation) {
//TODO animation stopped event
if (viewFlipper.getDisplayedChild()==intLastChild){
viewFlipper.stopFlipping();
}
}
};
//Get a reference to one of the animations set on the ViewFlipper
//In this example, I used the "In Animation"
viewFlipper.getInAnimation().setAnimationListener(mAnimationListener);
你能详细说明你翻转屏幕的意思吗?你是在谈论改变方向还是在“ViewFlipper”上执行某种滑动手势?你有任何代码来产生你可以显示的行为吗? – nil 2011-06-15 07:25:14
我可以p [在你可以从上面的问题中检查它的问题中查看我的代码。 – 2011-06-15 07:35:25