Android 如何防止ViewFlipper循环
我正在开发一个应用程序,其中我使用了一个带有自定义Android 如何防止ViewFlipper循环,android,viewflipper,Android,Viewflipper,我正在开发一个应用程序,其中我使用了一个带有自定义OnTouch实现的ViewFlipper。在ViewFlipper中,我有大约20幅图像供用户浏览。这很好,但是如果我在系列中的第20张图片上翻转屏幕,它会返回到第一张图片 我想防止视图翻转器循环回到第一个图像。相反,它应该在最后一个图像处停止 这是我的密码: import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; impor
OnTouch
实现的ViewFlipper
。在ViewFlipper
中,我有大约20幅图像供用户浏览。这很好,但是如果我在系列中的第20张图片上翻转屏幕,它会返回到第一张图片
我想防止视图翻转器
循环回到第一个图像。相反,它应该在最后一个图像处停止
这是我的密码:
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;
}
}
导入android.app.Activity;
导入android.os.Bundle;
导入android.view.MotionEvent;
导入android.view.view;
导入android.view.view.OnTouchListener;
导入android.view.animation.AnimationUtils;
导入android.widget.ArrayAdapter;
导入android.widget.LinearLayout;
导入android.widget.Spinner;
导入android.widget.ViewFlipper;
公共类Activity1将活动实现扩展到TouchListener{
浮动下降值;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//将main.XML设置为此活动的布局
setContentView(R.layout.main);
//把这两行加起来
LinearLayout layMain=(LinearLayout)findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener)this);
//向微调器添加几个国家/地区
Spinner Spinner Countries=(Spinner)findViewById(R.id.Spinner\u Countries);
ArrayAdapter countryArrayAdapter=新的ArrayAdapter(此,
android.R.layout.simple\u微调器\u下拉菜单\u项,
新字符串[]{“加拿大”、“美国”});
喷丝头国家/地区。setAdapter(countryArrayAdapter);
}
公共布尔onTouch(视图arg0、运动事件arg1){
//获取在此触摸事件上执行的操作
开关(arg1.getAction())
{
case MotionEvent.ACTION\u DOWN:
{
//当按下用户的手指时,存储X值
downXValue=arg1.getX();
打破
}
case MotionEvent.ACTION\u UP:
{
//获取用户释放手指时的X值
float currentX=arg1.getX();
//倒退:把东西往右边推
如果(向下X值<当前X)
{
//获取对ViewFlipper的引用
ViewFlipper vf=(ViewFlipper)findViewById(R.id.details);
//设置动画
setAnimation(AnimationUtils.loadAnimation(this,R.anim.push_left_out));
//翻转!
vf.showPrevious();
}
//向前:把东西推到左边
如果(向下X值>当前X)
{
//获取对ViewFlipper的引用
ViewFlipper vf=(ViewFlipper)findViewById(R.id.details);
//设置动画
设置动画(AnimationUtils.loadAnimation(这个,R.anim.push_left_in));
//翻转!
vf.showNext();
}
打破
}
}
//如果返回false,则不会记录这些操作
返回true;
}
}
以及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>
您知道viewflipper中有20个子对象。因此,在onclick中做一个if语句,检查getDisplayedChild()
是否低于20。如果是20或更高,则不要调用showNext()
我通过自定义ViewFlipper检测子对象的结束
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;
}
}
在Viewflipper上设置AnimationListener,然后在到达最后一张幻灯片时停止动画
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);
你能详细解释一下你翻转屏幕的意思吗?您是在谈论方向更改还是在
浏览页面上执行某种滑动手势?你有任何代码可以产生这种行为吗?我可以在问题中使用我的代码,你可以从上面的qestion检查它。