Android的多SurfaceViews [英] Android Multiple SurfaceViews
问题描述
我想要在一个屏幕上，一个在上半部分（BoardView），一个在底半部（StatusView），而最后一个作为一个额外的层上方的上半部分（TileView）与3- SurfaceViews工作（见主的.xml）。
I'm trying to work with 3 SurfaceViews on one screen, one on top half (BoardView), one on bottom half (StatusView), and the last one as an extra layer above the top half (TileView) (see main.xml).
我创建了一个类MySurfaceView，这是由BoardView，StatusView和TileView。
I created a class MySurfaceView, which is extended by BoardView, StatusView and TileView.
我有多个问题与此有关。
I've got multiple problems with this.
让我先给code。
main.xml中：
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/main_background">
<com.niek.test.BoardView
android:id="@+id/boardview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/boardview">
<com.niek.test.StatusView
android:id="@+id/statusview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#F0931E"
android:layout_below="@+id/boardview" />
<com.niek.test.TileView
android:id="@+id/tileview"
android:layout_width="180dip"
android:layout_height="60dip"
android:layout_gravity="bottom"/>
</FrameLayout>
</RelativeLayout>
MainActivity.java：
MainActivity.java:
package com.niek.test;
public class MainActivity extends Activity {
private Board board;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
board = new Board();
BoardView boardView = (BoardView) findViewById(R.id.boardview);
boardView.setBoard(board);
StatusView statusView = (StatusView) findViewById(R.id.statusview);
statusView.setBoard(board);
}
}
MySurfaceView.java
MySurfaceView.java
package com.niek.test;
public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback {
protected DrawThread drawThread;
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
getHolder().addCallback(this);
setFocusable(true);
drawThread = new DrawThread(getHolder());
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
drawThread.setRunning(true);
drawThread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// we have to tell thread to shut down & wait for it to finish, or else
// it might touch the Surface after we return and explode
boolean retry = true;
drawThread.setRunning(false);
while (retry) {
try {
drawThread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
protected class DrawThread extends Thread {
private SurfaceHolder surfaceHolder;
private boolean isRunning;
public DrawThread(SurfaceHolder surfaceHolder) {
this.surfaceHolder = surfaceHolder;
isRunning = false;
}
public void setRunning(boolean run) {
isRunning = run;
}
public void run() {
Canvas c;
while (isRunning) {
try {
Thread.sleep(100);
} catch (Exception e) {
// TODO: handle exception
}
c = null;
try {
c = surfaceHolder.lockCanvas(null);
synchronized (surfaceHolder) {
onDraw(c);
postInvalidate();
}
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
}
这三大类扩展MySurfaceView：
These three classes extend MySurfaceView:
BoardView.java
BoardView.java
package com.niek.test;
public class BoardView extends MySurfaceView {
private int squareSize, marginX, marginY;
private Board board;
Paint boardBorder;
public BoardView(Context context, AttributeSet attrs) {
super(context, attrs);
board = null;
}
public void setBoard(Board board) {
this.board = board;
}
private void init(SurfaceHolder holder) {
Canvas canvas = null;
try {
canvas = holder.lockCanvas();
/* Initialize the board */
squareSize = canvas.getWidth() / Board.GRIDSIZE;
/* Size the view */
LayoutParams lp = getLayoutParams();
lp.height = (squareSize * Board.GRIDSIZE) + 4;
setLayoutParams(lp);
/* Place the board neatly in the center */
marginX = (canvas.getWidth() - (squareSize * Board.GRIDSIZE)) / 2;
marginY = 1;
} finally {
holder.unlockCanvasAndPost(canvas);
}
boardBorder = new Paint();
boardBorder.setColor(Color.RED);
boardBorder.setStyle(Style.STROKE);
}
@Override
public void onDraw(Canvas canvas) {
drawBoard(board, canvas);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
init(holder);
super.surfaceCreated(holder);
}
private void drawBoard(Board board, Canvas canvas) {
synchronized (board) {
if (board != null) {
for (Square[] ys : board.getSquares()) {
for (Square xs : ys) {
xs.onDraw(canvas, squareSize, squareSize, marginX, marginY);
}
}
}
canvas.drawRect(marginX - 1, marginY - 1, marginX + squareSize * Board.GRIDSIZE + 1, marginY + squareSize * Board.GRIDSIZE + 1, boardBorder);
}
}
}
StatusView.java
StatusView.java
package com.niek.test;
public class StatusView extends MySurfaceView {
private Board board;
private Paint textPaint;
public StatusView(Context context, AttributeSet attrs) {
super(context, attrs);
board = null;
textPaint = new Paint();
textPaint.setColor(Color.BLACK);
textPaint.setTextSize(20);
textPaint.setTypeface(Typeface.DEFAULT_BOLD);
}
public void setBoard(Board board) {
this.board = board;
}
int tmp=0;
@Override
public void onDraw(Canvas c) {
if (board != null) {
c.drawText(tmp+"", 10, 20, textPaint);
tmp++;
System.out.println(tmp);
}
}
}
TileView.java
TileView.java
package com.niek.test;
public class TileView extends MySurfaceView {
public TileView(Context context, AttributeSet attrs) {
super(context, attrs);
System.out.println(0);
}
int tmp =0;
@Override
public void onDraw(Canvas c) {
System.out.println(2);
Paint p= new Paint();
p.setColor(Color.RED);
c.drawColor(Color.RED);
c.drawText(tmp+"",10,10,p);
tmp++;
}
}
现在我有哪些问题？
首先，你可以在MySurfaceView看到我有这样的：
First off, as you can see in MySurfaceView I've got this:
try {
c = surfaceHolder.lockCanvas(null);
synchronized (surfaceHolder) {
onDraw(c);
postInvalidate();
}
}
当我只用的OnDraw（C），只有BoardView被抽中，StatusView不拿得出，但正在执行的StatusView的OnDraw中的TMP的增量。 当我只用postInvalidate（），同样的故事，但只有StatusView被抽出，BoardView没有。 所以这就是为什么我使用这两种方法，而这两种观点拿得出。
When I only use onDraw(c), only the BoardView gets drawn, the StatusView doesn't get drawn, but the tmp increments in the onDraw of StatusView are being executed. When I only use postInvalidate(), same story, but only StatusView gets drawn, BoardView doesn't. So that's why I use both methods, and both Views get drawn.
然后有TileView，所述的System.out（2）被示出在的logcat，但视图不获取绘制。这是一个黑色方块代替的红色正方形请问它是在OnDraw的方法。
Then there's TileView, the System.out(2) is being shown in logcat, but the view doesn't get drawn. It is a black square instead of the red square I ask it to be in the onDraw method.
当我关闭屏幕，然后再打开时，TileView也拿得出，和TMP的增量显示。
When I turn the screen off and then on again, the TileView does get drawn, and the tmp increments are shown.
谁能帮我？
为了清楚起见，我创建了此基础上这个教程。
For clarity, I've created this based on this tutorial.
推荐答案
看起来你不应该在一个布局创建多个SurfaceViews。 根据这一 2 的 的帖子写的Android框架工程师：
It looks like you are not supposed to create multiple SurfaceViews on one Layout. According to this two posts written by Android framework engineer:
的实现方式表面的看法是，一个单独的表面被创建和Z-责令其背后包含窗口，和透明像素卷入其中SurfaceView是这样你就可以看到后面的表面的矩形。我们从来没有打算允许多个表面观。的
和
你应该有效地认为SurfaceView为您嵌入你的窗口内的覆盖， 给你的，你可以直接独立于普通视图更新系统中画出一个区域。的
you should effectively think of SurfaceView as an overlay you embed inside your window, giving you an area in which you can directly draw independently of the normal view update system.
那么，你可以做的，就是用一个SurfaceView绘制所有您想要的图形。
So, what you can do, is use one SurfaceView to draw all the graphics you want.
这篇关于Android的多SurfaceViews的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
