Thu*_*bit 5 android surfaceview
编辑2a:随意跳到底部以获得简洁的问题.
我可以通过xml绘制SurfaceView.就我而言,我正在创建一个电子书,它将在SurfaceViews上为本书的每个页面运行不同的动画.
我有一个.xml有FrameLayout调用的布局@+id/animation_layout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<fi.harism.curl.CurlView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/curl"
>
</fi.harism.curl.CurlView>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/animation_layout"
/>
<include layout="@layout/narration"
/>
</RelativeLayout>
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根据正在显示的书的哪个页面,我想在我的一组类中添加其中一个类的不同实例SurfaceView.
Page01SurfaceView extends PageAniSurfaceView {
//
// code here includes onDraw() definition
//
}
Page02SurfaceView extends PageAniSurfaceView {
//
// code here includes onDraw() definition
//
}
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PageAniSurfaceView基本上在实例化时创建一个Thread,并在创建View时启动该线程.
public class PageAniSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
private final String TAG = this.getClass().getSimpleName();
private TutorialThread _thread;
public PageAniSurfaceView(Context context) {
super(context);
init();
}
public PageAniSurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public void setBackground(int bg_id)
{
// adding the callback (this) to the surface holder to intercept events
getHolder().addCallback(this);
// make the PageAniSurfaceView focusable so it can handle events
setFocusable(true);
}
protected void init()
{
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
_thread = new TutorialThread(getHolder(), this);
_thread.setRunning(true);
_thread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
boolean retry = true;
_thread.setRunning(false);
while (retry) {
try {
_thread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
protected void draw_bitmaps(Canvas canvas)
{
// will be overridden by child classes
}
@Override
protected void onDraw(Canvas canvas) {
if(this.getVisibility() == View.VISIBLE)
{
if(canvas != null)
{
draw_bitmaps(canvas);
}
}
}
public void update_bitmaps()
{
// will be overridden by child classes
}
public void elementStarted(PageElement _pageElement) {
// Nothing in parent class
}
public void elementFinished(PageElement mElement) {
// Nothing in parent class
}
}
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我有一个叫做PageDisplayer跟踪我们所在页面的类,以及addView()我需要为该页面包含的特定SurfaceView类.
public void displayPage()
{
page = sSystemRegistry.pageSystem.getCurrentPage();
mBookReader.mAnimationLayout.removeAllViews();
PageAniSurfaceView _ani = null;
switch(page.index)
{
case 1:
_ani = new Page01SurfaceView(mBookReader);
break;
case 2:
_ani = new Page02SurfaceView(mBookReader);
break;
case 3:
_ani = new Page03SurfaceView(mBookReader);
break;
}
if(_ani != null)
{
_ani.setWillNotDraw(false);
// mBookReader.mAnimationLayout is a FrameLayout in my .xml
mBookReader.mAnimationLayout.addView(_ani);
mElementDisplayer.setElementListener(_ani);
}
}
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通过断点或LogCat,我可以告诉线程正在运行,并且正在调用onDraws.在例如Page01SurfaceView中定义和显示的位图被绘制一次,但是当update_bitmaps()改变位图的(x,y)坐标时不重绘.
为什么每次调用时都没有绘制位图onDraw(Canvas)?
编辑:如果位图上方的视图中有动画,则会显示SurfaceView上的位图.
编辑2:简洁问题:
ImageView上面的Z订单是否会SurfaceView阻止SurfaceView自己绘制?
我应该只使用View而不是SurfaceView?我要尝试并报告回来.
我只是使用 View,而不是 SurfaceView。
Dianne Hackborn 说“表面视图非常特殊,而不是真正的视图(表面是一个与你自己的 Z 排序的单独窗口),它们的 Z 排序与你的视图不匹配。表面视图是一个又大又重的对象;你是无意以这种方式将 SurfaceView 视为常规视图。”
https://groups.google.com/d/topic/android-developers/COffLpanlz0/discussion
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