Android用户界面 UI组件--AdapterView及其子类(二) AdapterViewAnimator及其子类

AdapterViewAnimator：当在视图间切换时会显示动画.

android:animateFirstView

定义ViewAnimation首次显示时是否对当前视图应用动画.
android:inAnimation

标识显示视图时使用的动画.

android:loopViews

定义当动画执行到列表尾部后,是否循环执行到第一个视图.
android:outAnimation

标识隐藏视图时使用的动画.

代码中
//淡入淡出效果
picFlipper.setInAnimation(this, android.R.animator.fade_in);
picFlipper.setOutAnimation(this,android.R.animator.fade_out);

从左到右进入屏幕
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="3000"
android:fromXDelta="-100%p"
android:toXDelta="0" />
</set>
从左到右出去屏幕
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="3000"
android:fromXDelta="0"
android:toXDelta="100%p" />
</set>
从右到左进入屏幕
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="3000"
android:fromXDelta="100%p"
android:toXDelta="0" />
</set>
从右到左出去屏幕
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="3000"
android:fromXDelta="100%p"
android:toXDelta="0" />
</set>

StackView:

堆栈式显示
不要一次将很多大图片放进去,会内存溢出
可手动拖拽移除栈中的View
android:loopViews 定义是否循环显示View.

例子：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="horizontal" >    <StackView        android:id="@+id/mStackView"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:loopViews="true"        />    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical" >        <Button            android:id="@+id/btn_pre"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="前一张"            tools:ignore="HardcodedText" />        <Button            android:id="@+id/btn_next"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="后一张"            tools:ignore="HardcodedText" />    </LinearLayout></LinearLayout>

package com.light.android.study;import android.app.Activity;import android.content.Context;import android.graphics.Color;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.LinearLayout;import android.widget.StackView;public class MainActivity extends Activity {    private StackView stackView;    private Button next,pre;    private int [] mColors = {Color.BLUE, Color.CYAN, Color.GRAY, Color.GREEN, Color.RED};    @Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();initListener();}private void init(){stackView = (StackView) findViewById(R.id.mStackView);//淡入淡出效果stackView.setInAnimation(this, android.R.animator.fade_in);stackView.setOutAnimation(this,android.R.animator.fade_out);next = (Button) findViewById(R.id.btn_next);pre = (Button) findViewById(R.id.btn_pre);}private void initListener(){ColorAdapter adapter = new ColorAdapter(this,mColors);            stackView.setAdapter(adapter);                      //下一张           next.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {stackView.showNext();}   });                      //上一张           pre.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {stackView.showPrevious();}   });           }public class ColorAdapter extends BaseAdapter {private Context mContext;private int [] mColors;public ColorAdapter(Context context, int [] colors) {mContext = context;mColors = colors;}public int getCount() {return mColors == null ? 0 : mColors.length;}public Object getItem(int position) {return mColors == null ? null : mColors[position];}public long getItemId(int position) {return position;}public View getView(int position, View cacheView, ViewGroup parent) {LinearLayout.LayoutParams colorLayoutParams = new LinearLayout.LayoutParams(100, 100);LinearLayout colorLayout = new LinearLayout(mContext);colorLayout.setBackgroundColor(mColors[position]);colorLayout.setLayoutParams(colorLayoutParams);return colorLayout;}}}

效果：

AdapterViewFlipper：

ViewFlipper主要用来实现View的自动切换
android:autoStart
自动播放 "true" or "false"
android:flipInterval
设置View切换的时间间隔.参数为毫秒
setAdapter(Adapter adapter)
设置用于为该小部件的视图提供用于显示的数据的适配器.
showNext()
显示下一个子视图.
showPrevious()
显示上一个子视图.
startFlipping()
开始进行View的切换,切换会循环进行.
stopFlipping()
停止View的切换

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/layout"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical" >    <AdapterViewFlipper        android:id="@+id/flipper"        android:layout_width="match_parent"        android:layout_height="match_parent"         android:flipInterval="5000"        android:layout_alignTop="@id/layout">    </AdapterViewFlipper>        <Button            android:id="@+id/btn_pre"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignBottom="@id/flipper"            android:layout_alignLeft="@id/layout"            android:text="上一张"            tools:ignore="HardcodedText"             />               <Button            android:id="@+id/btn_next"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignBottom="@id/flipper"            android:layout_toRightOf="@id/btn_pre"            android:text="下一张"            tools:ignore="HardcodedText" />        <ToggleButton            android:id="@+id/btn_start"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_alignBottom="@id/flipper"            android:layout_toRightOf="@id/btn_next"            android:textOff="停止自动播放"            android:textOn="开始自动播放"            tools:ignore="HardcodedText" /></RelativeLayout>

flipper项目的布局文件：

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <ImageView        android:id="@+id/iv_pic"        android:layout_width="match_parent"        android:layout_height="match_parent"        tools:ignore="ContentDescription" /></FrameLayout>

package com.light.android.study;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.AdapterViewFlipper;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.CompoundButton;import android.widget.CompoundButton.OnCheckedChangeListener;import android.widget.ImageView;import android.widget.ToggleButton;public class MainActivity extends Activity {    private AdapterViewFlipper picFlipper;    private Button next,pre;    private ToggleButton start;    private int[] images=new int[]{            R.drawable.lijiang,            R.drawable.qiao,            R.drawable.shuangta,            R.drawable.shui,            R.drawable.xiangbi    };    @Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();initListener();}private void init(){picFlipper = (AdapterViewFlipper) findViewById(R.id.flipper);//淡入淡出效果picFlipper.setInAnimation(this, android.R.animator.fade_in);picFlipper.setOutAnimation(this,android.R.animator.fade_out);next = (Button) findViewById(R.id.btn_next);pre = (Button) findViewById(R.id.btn_pre);start = (ToggleButton) findViewById(R.id.btn_start);}private void initListener(){           MyFlipperAdapter adapter = new MyFlipperAdapter(this,images);           picFlipper.setAdapter(adapter);                      //下一张           next.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {picFlipper.showNext();picFlipper.stopFlipping();}   });                      //上一张           pre.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {picFlipper.showPrevious();picFlipper.stopFlipping();}   });                      //设置自动播放           start.setOnCheckedChangeListener(new OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if(isChecked){picFlipper.startFlipping();}else{picFlipper.stopFlipping();}}});           }private class MyFlipperAdapter extends BaseAdapter{            private LayoutInflater inflater;            private Context c;            private int[] images;            public MyFlipperAdapter(Context context,int[] images) {            this.c = context;            this.images = images;            inflater = LayoutInflater.from(c);}@Overridepublic int getCount() {return images.length;}@Overridepublic Object getItem(int position) {//返回该位置对应的图片return images[position];}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {   if(convertView==null){     convertView = inflater.inflate(R.layout.flipper_layout, null);   }   ImageView image = (ImageView) convertView.findViewById(R.id.iv_pic);   image.setImageResource(images[position]);               image.setScaleType(ImageView.ScaleType.CENTER_CROP);return convertView;}}}

效果：

这里编写的时候出现过一个异常java.lang.RuntimeException: Unknown animator name: alpha

后来查资料发现了一个值得注意的地方

研究了一下Fragment动画，发现以下代码不好用
FragmentTransaction ft = getFragmentManager()
.beginTransaction();
ft.setCustomAnimations(android.R.anim.fade_in,
android.R.anim.fade_out);
会出现错误
java.lang.RuntimeException: Unknown animator name: alpha
研究了半天才发现，原来Fragment的动画不能用系统的anim里的动画
后来改成
FragmentTransaction ft = getFragmentManager()
.beginTransaction();
ft.setCustomAnimations(android.R.animator.fade_in,
android.R.animator.fade_out);
果断好用，打开anim里的fade_in 和 animator里的fade_in发现：
anim下的fade_in.xml文件
标签为alpha
animator下的fade_in.xml文件
标签为objectAnimator
fragment的动画只支持标签为 objectAnimator 的动画效果。
把补间动画的类型写在propertyName字段这样就可实现

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