Android example source code file (SurfaceView.java)
The SurfaceView.java Android example source code/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view;
import android.util.DisplayMetrics;
import com.android.internal.view.BaseIWindow;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.CompatibilityInfo.Translator;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.Region;
import android.os.Handler;
import android.os.Message;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.ParcelFileDescriptor;
import android.util.AttributeSet;
import android.util.Config;
import android.util.Log;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.concurrent.locks.ReentrantLock;
/**
* Provides a dedicated drawing surface embedded inside of a view hierarchy.
* You can control the format of this surface and, if you like, its size; the
* SurfaceView takes care of placing the surface at the correct location on the
* screen
*
* <p>The surface is Z ordered so that it is behind the window holding its
* SurfaceView; the SurfaceView punches a hole in its window to allow its
* surface to be displayed. The view hierarchy will take care of correctly
* compositing with the Surface any siblings of the SurfaceView that would
* normally appear on top of it. This can be used to place overlays such as
* buttons on top of the Surface, though note however that it can have an
* impact on performance since a full alpha-blended composite will be performed
* each time the Surface changes.
*
* <p>Access to the underlying surface is provided via the SurfaceHolder interface,
* which can be retrieved by calling {@link #getHolder}.
*
* <p>The Surface will be created for you while the SurfaceView's window is
* visible; you should implement {@link SurfaceHolder.Callback#surfaceCreated}
* and {@link SurfaceHolder.Callback#surfaceDestroyed} to discover when the
* Surface is created and destroyed as the window is shown and hidden.
*
* <p>One of the purposes of this class is to provide a surface in which a
* secondary thread can render in to the screen. If you are going to use it
* this way, you need to be aware of some threading semantics:
*
* <ul>
* <li> All SurfaceView and
* {@link SurfaceHolder.Callback SurfaceHolder.Callback} methods will be called
* from the thread running the SurfaceView's window (typically the main thread
* of the application). They thus need to correctly synchronize with any
* state that is also touched by the drawing thread.
* <li> You must ensure that the drawing thread only touches the underlying
* Surface while it is valid -- between
* {@link SurfaceHolder.Callback#surfaceCreated SurfaceHolder.Callback.surfaceCreated()}
* and
* {@link SurfaceHolder.Callback#surfaceDestroyed SurfaceHolder.Callback.surfaceDestroyed()}.
* </ul>
*/
public class SurfaceView extends View {
static private final String TAG = "SurfaceView";
static private final boolean DEBUG = false;
static private final boolean localLOGV = DEBUG ? true : Config.LOGV;
final ArrayList<SurfaceHolder.Callback> mCallbacks
= new ArrayList<SurfaceHolder.Callback>();
final int[] mLocation = new int[2];
final ReentrantLock mSurfaceLock = new ReentrantLock();
final Surface mSurface = new Surface();
boolean mDrawingStopped = true;
final WindowManager.LayoutParams mLayout
= new WindowManager.LayoutParams();
IWindowSession mSession;
MyWindow mWindow;
final Rect mVisibleInsets = new Rect();
final Rect mWinFrame = new Rect();
final Rect mContentInsets = new Rect();
final Configuration mConfiguration = new Configuration();
static final int KEEP_SCREEN_ON_MSG = 1;
static final int GET_NEW_SURFACE_MSG = 2;
static final int UPDATE_WINDOW_MSG = 3;
int mWindowType = WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA;
boolean mIsCreating = false;
final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case KEEP_SCREEN_ON_MSG: {
setKeepScreenOn(msg.arg1 != 0);
} break;
case GET_NEW_SURFACE_MSG: {
handleGetNewSurface();
} break;
case UPDATE_WINDOW_MSG: {
updateWindow(false);
} break;
}
}
};
final ViewTreeObserver.OnScrollChangedListener mScrollChangedListener
= new ViewTreeObserver.OnScrollChangedListener() {
public void onScrollChanged() {
updateWindow(false);
}
};
boolean mRequestedVisible = false;
boolean mWindowVisibility = false;
boolean mViewVisibility = false;
int mRequestedWidth = -1;
int mRequestedHeight = -1;
int mRequestedFormat = PixelFormat.OPAQUE;
int mRequestedType = -1;
boolean mHaveFrame = false;
boolean mDestroyReportNeeded = false;
boolean mNewSurfaceNeeded = false;
long mLastLockTime = 0;
boolean mVisible = false;
int mLeft = -1;
int mTop = -1;
int mWidth = -1;
int mHeight = -1;
int mFormat = -1;
int mType = -1;
final Rect mSurfaceFrame = new Rect();
int mLastSurfaceWidth = -1, mLastSurfaceHeight = -1;
boolean mUpdateWindowNeeded;
boolean mReportDrawNeeded;
private Translator mTranslator;
public SurfaceView(Context context) {
super(context);
setWillNotDraw(true);
}
public SurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
setWillNotDraw(true);
}
public SurfaceView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setWillNotDraw(true);
}
/**
* Return the SurfaceHolder providing access and control over this
* SurfaceView's underlying surface.
*
* @return SurfaceHolder The holder of the surface.
*/
public SurfaceHolder getHolder() {
return mSurfaceHolder;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mParent.requestTransparentRegion(this);
mSession = getWindowSession();
mLayout.token = getWindowToken();
mLayout.setTitle("SurfaceView");
mViewVisibility = getVisibility() == VISIBLE;
getViewTreeObserver().addOnScrollChangedListener(mScrollChangedListener);
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
mWindowVisibility = visibility == VISIBLE;
mRequestedVisible = mWindowVisibility && mViewVisibility;
updateWindow(false);
}
@Override
public void setVisibility(int visibility) {
super.setVisibility(visibility);
mViewVisibility = visibility == VISIBLE;
mRequestedVisible = mWindowVisibility && mViewVisibility;
updateWindow(false);
}
/**
* This method is not intended for general use. It was created
* temporarily to improve performance of 3D layers in Launcher
* and should be removed and fixed properly.
*
* Do not call this method. Ever.
*
* @hide
*/
protected void showSurface() {
if (mSession != null) {
updateWindow(true);
}
}
/**
* This method is not intended for general use. It was created
* temporarily to improve performance of 3D layers in Launcher
* and should be removed and fixed properly.
*
* Do not call this method. Ever.
*
* @hide
*/
protected void hideSurface() {
if (mSession != null && mWindow != null) {
mSurfaceLock.lock();
try {
DisplayMetrics metrics = getResources().getDisplayMetrics();
mLayout.x = metrics.widthPixels * 3;
mSession.relayout(mWindow, mLayout, mWidth, mHeight, VISIBLE, false,
mWinFrame, mContentInsets, mVisibleInsets, mConfiguration, mSurface);
} catch (RemoteException e) {
// Ignore
} finally {
mSurfaceLock.unlock();
}
}
}
@Override
protected void onDetachedFromWindow() {
getViewTreeObserver().removeOnScrollChangedListener(mScrollChangedListener);
mRequestedVisible = false;
updateWindow(false);
mHaveFrame = false;
if (mWindow != null) {
try {
mSession.remove(mWindow);
} catch (RemoteException ex) {
}
mWindow = null;
}
mSession = null;
mLayout.token = null;
super.onDetachedFromWindow();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = getDefaultSize(mRequestedWidth, widthMeasureSpec);
int height = getDefaultSize(mRequestedHeight, heightMeasureSpec);
setMeasuredDimension(width, height);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
updateWindow(false);
}
@Override
public boolean gatherTransparentRegion(Region region) {
if (mWindowType == WindowManager.LayoutParams.TYPE_APPLICATION_PANEL) {
return super.gatherTransparentRegion(region);
}
boolean opaque = true;
if ((mPrivateFlags & SKIP_DRAW) == 0) {
// this view draws, remove it from the transparent region
opaque = super.gatherTransparentRegion(region);
} else if (region != null) {
int w = getWidth();
int h = getHeight();
if (w>0 && h>0) {
getLocationInWindow(mLocation);
// otherwise, punch a hole in the whole hierarchy
int l = mLocation[0];
int t = mLocation[1];
region.op(l, t, l+w, t+h, Region.Op.UNION);
}
}
if (PixelFormat.formatHasAlpha(mRequestedFormat)) {
opaque = false;
}
return opaque;
}
@Override
public void draw(Canvas canvas) {
if (mWindowType != WindowManager.LayoutParams.TYPE_APPLICATION_PANEL) {
// draw() is not called when SKIP_DRAW is set
if ((mPrivateFlags & SKIP_DRAW) == 0) {
// punch a whole in the view-hierarchy below us
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
}
}
super.draw(canvas);
}
@Override
protected void dispatchDraw(Canvas canvas) {
if (mWindowType != WindowManager.LayoutParams.TYPE_APPLICATION_PANEL) {
// if SKIP_DRAW is cleared, draw() has already punched a hole
if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
// punch a whole in the view-hierarchy below us
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
}
}
// reposition ourselves where the surface is
mHaveFrame = true;
updateWindow(false);
super.dispatchDraw(canvas);
}
/**
* Control whether the surface view's surface is placed on top of another
* regular surface view in the window (but still behind the window itself).
* This is typically used to place overlays on top of an underlying media
* surface view.
*
* <p>Note that this must be set before the surface view's containing
* window is attached to the window manager.
*
* <p>Calling this overrides any previous call to {@link #setZOrderOnTop}.
*/
public void setZOrderMediaOverlay(boolean isMediaOverlay) {
mWindowType = isMediaOverlay
? WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA_OVERLAY
: WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA;
}
/**
* Control whether the surface view's surface is placed on top of its
* window. Normally it is placed behind the window, to allow it to
* (for the most part) appear to composite with the views in the
* hierarchy. By setting this, you cause it to be placed above the
* window. This means that none of the contents of the window this
* SurfaceView is in will be visible on top of its surface.
*
* <p>Note that this must be set before the surface view's containing
* window is attached to the window manager.
*
* <p>Calling this overrides any previous call to {@link #setZOrderMediaOverlay}.
*/
public void setZOrderOnTop(boolean onTop) {
if (onTop) {
mWindowType = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL;
// ensures the surface is placed below the IME
mLayout.flags |= WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
} else {
mWindowType = WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA;
mLayout.flags &= ~WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
}
}
/**
* Hack to allow special layering of windows. The type is one of the
* types in WindowManager.LayoutParams. This is a hack so:
* @hide
*/
public void setWindowType(int type) {
mWindowType = type;
}
private void updateWindow(boolean force) {
if (!mHaveFrame) {
return;
}
ViewRoot viewRoot = (ViewRoot) getRootView().getParent();
if (viewRoot != null) {
mTranslator = viewRoot.mTranslator;
}
Resources res = getContext().getResources();
if (mTranslator != null || !res.getCompatibilityInfo().supportsScreen()) {
mSurface.setCompatibleDisplayMetrics(res.getDisplayMetrics(), mTranslator);
}
int myWidth = mRequestedWidth;
if (myWidth <= 0) myWidth = getWidth();
int myHeight = mRequestedHeight;
if (myHeight <= 0) myHeight = getHeight();
getLocationInWindow(mLocation);
final boolean creating = mWindow == null;
final boolean formatChanged = mFormat != mRequestedFormat;
final boolean sizeChanged = mWidth != myWidth || mHeight != myHeight;
final boolean visibleChanged = mVisible != mRequestedVisible
|| mNewSurfaceNeeded;
final boolean typeChanged = mType != mRequestedType;
if (force || creating || formatChanged || sizeChanged || visibleChanged
|| typeChanged || mLeft != mLocation[0] || mTop != mLocation[1]
|| mUpdateWindowNeeded || mReportDrawNeeded) {
if (localLOGV) Log.i(TAG, "Changes: creating=" + creating
+ " format=" + formatChanged + " size=" + sizeChanged
+ " visible=" + visibleChanged
+ " left=" + (mLeft != mLocation[0])
+ " top=" + (mTop != mLocation[1]));
try {
final boolean visible = mVisible = mRequestedVisible;
mLeft = mLocation[0];
mTop = mLocation[1];
mWidth = myWidth;
mHeight = myHeight;
mFormat = mRequestedFormat;
mType = mRequestedType;
// Scaling/Translate window's layout here because mLayout is not used elsewhere.
// Places the window relative
mLayout.x = mLeft;
mLayout.y = mTop;
mLayout.width = getWidth();
mLayout.height = getHeight();
if (mTranslator != null) {
mTranslator.translateLayoutParamsInAppWindowToScreen(mLayout);
}
mLayout.format = mRequestedFormat;
mLayout.flags |=WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
| WindowManager.LayoutParams.FLAG_SCALED
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
;
if (!getContext().getResources().getCompatibilityInfo().supportsScreen()) {
mLayout.flags |= WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
}
mLayout.memoryType = mRequestedType;
if (mWindow == null) {
mWindow = new MyWindow(this);
mLayout.type = mWindowType;
mLayout.gravity = Gravity.LEFT|Gravity.TOP;
mSession.add(mWindow, mLayout,
mVisible ? VISIBLE : GONE, mContentInsets);
}
if (visibleChanged && (!visible || mNewSurfaceNeeded)) {
reportSurfaceDestroyed();
}
mNewSurfaceNeeded = false;
boolean realSizeChanged;
boolean reportDrawNeeded;
mSurfaceLock.lock();
try {
mUpdateWindowNeeded = false;
reportDrawNeeded = mReportDrawNeeded;
mReportDrawNeeded = false;
mDrawingStopped = !visible;
final int relayoutResult = mSession.relayout(
mWindow, mLayout, mWidth, mHeight,
visible ? VISIBLE : GONE, false, mWinFrame, mContentInsets,
mVisibleInsets, mConfiguration, mSurface);
if ((relayoutResult&WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0) {
mReportDrawNeeded = true;
}
if (localLOGV) Log.i(TAG, "New surface: " + mSurface
+ ", vis=" + visible + ", frame=" + mWinFrame);
mSurfaceFrame.left = 0;
mSurfaceFrame.top = 0;
if (mTranslator == null) {
mSurfaceFrame.right = mWinFrame.width();
mSurfaceFrame.bottom = mWinFrame.height();
} else {
float appInvertedScale = mTranslator.applicationInvertedScale;
mSurfaceFrame.right = (int) (mWinFrame.width() * appInvertedScale + 0.5f);
mSurfaceFrame.bottom = (int) (mWinFrame.height() * appInvertedScale + 0.5f);
}
final int surfaceWidth = mSurfaceFrame.right;
final int surfaceHeight = mSurfaceFrame.bottom;
realSizeChanged = mLastSurfaceWidth != surfaceWidth
|| mLastSurfaceHeight != surfaceHeight;
mLastSurfaceWidth = surfaceWidth;
mLastSurfaceHeight = surfaceHeight;
} finally {
mSurfaceLock.unlock();
}
try {
if (visible) {
mDestroyReportNeeded = true;
SurfaceHolder.Callback callbacks[];
synchronized (mCallbacks) {
callbacks = new SurfaceHolder.Callback[mCallbacks.size()];
mCallbacks.toArray(callbacks);
}
if (visibleChanged) {
mIsCreating = true;
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceCreated(mSurfaceHolder);
}
}
if (creating || formatChanged || sizeChanged
|| visibleChanged || realSizeChanged) {
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceChanged(mSurfaceHolder, mFormat, myWidth, myHeight);
}
}
} else {
mSurface.release();
}
} finally {
mIsCreating = false;
if (creating || reportDrawNeeded) {
mSession.finishDrawing(mWindow);
}
}
} catch (RemoteException ex) {
}
if (localLOGV) Log.v(
TAG, "Layout: x=" + mLayout.x + " y=" + mLayout.y +
" w=" + mLayout.width + " h=" + mLayout.height +
", frame=" + mSurfaceFrame);
}
}
private void reportSurfaceDestroyed() {
if (mDestroyReportNeeded) {
mDestroyReportNeeded = false;
SurfaceHolder.Callback callbacks[];
synchronized (mCallbacks) {
callbacks = new SurfaceHolder.Callback[mCallbacks.size()];
mCallbacks.toArray(callbacks);
}
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceDestroyed(mSurfaceHolder);
}
}
super.onDetachedFromWindow();
}
void handleGetNewSurface() {
mNewSurfaceNeeded = true;
updateWindow(false);
}
/**
* Check to see if the surface has fixed size dimensions or if the surface's
* dimensions are dimensions are dependent on its current layout.
*
* @return true if the surface has dimensions that are fixed in size
* @hide
*/
public boolean isFixedSize() {
return (mRequestedWidth != -1 || mRequestedHeight != -1);
}
private static class MyWindow extends BaseIWindow {
private final WeakReference<SurfaceView> mSurfaceView;
public MyWindow(SurfaceView surfaceView) {
mSurfaceView = new WeakReference<SurfaceView>(surfaceView);
}
public void resized(int w, int h, Rect coveredInsets,
Rect visibleInsets, boolean reportDraw, Configuration newConfig) {
SurfaceView surfaceView = mSurfaceView.get();
if (surfaceView != null) {
if (localLOGV) Log.v(
"SurfaceView", surfaceView + " got resized: w=" +
w + " h=" + h + ", cur w=" + mCurWidth + " h=" + mCurHeight);
surfaceView.mSurfaceLock.lock();
try {
if (reportDraw) {
surfaceView.mUpdateWindowNeeded = true;
surfaceView.mReportDrawNeeded = true;
surfaceView.mHandler.sendEmptyMessage(UPDATE_WINDOW_MSG);
} else if (surfaceView.mWinFrame.width() != w
|| surfaceView.mWinFrame.height() != h) {
surfaceView.mUpdateWindowNeeded = true;
surfaceView.mHandler.sendEmptyMessage(UPDATE_WINDOW_MSG);
}
} finally {
surfaceView.mSurfaceLock.unlock();
}
}
}
public void dispatchKey(KeyEvent event) {
SurfaceView surfaceView = mSurfaceView.get();
if (surfaceView != null) {
//Log.w("SurfaceView", "Unexpected key event in surface: " + event);
if (surfaceView.mSession != null && surfaceView.mSurface != null) {
try {
surfaceView.mSession.finishKey(surfaceView.mWindow);
} catch (RemoteException ex) {
}
}
}
}
public void dispatchPointer(MotionEvent event, long eventTime,
boolean callWhenDone) {
Log.w("SurfaceView", "Unexpected pointer event in surface: " + event);
//if (mSession != null && mSurface != null) {
// try {
// //mSession.finishKey(mWindow);
// } catch (RemoteException ex) {
// }
//}
}
public void dispatchTrackball(MotionEvent event, long eventTime,
boolean callWhenDone) {
Log.w("SurfaceView", "Unexpected trackball event in surface: " + event);
//if (mSession != null && mSurface != null) {
// try {
// //mSession.finishKey(mWindow);
// } catch (RemoteException ex) {
// }
//}
}
public void dispatchAppVisibility(boolean visible) {
// The point of SurfaceView is to let the app control the surface.
}
public void dispatchGetNewSurface() {
SurfaceView surfaceView = mSurfaceView.get();
if (surfaceView != null) {
Message msg = surfaceView.mHandler.obtainMessage(GET_NEW_SURFACE_MSG);
surfaceView.mHandler.sendMessage(msg);
}
}
public void windowFocusChanged(boolean hasFocus, boolean touchEnabled) {
Log.w("SurfaceView", "Unexpected focus in surface: focus=" + hasFocus + ", touchEnabled=" + touchEnabled);
}
public void executeCommand(String command, String parameters, ParcelFileDescriptor out) {
}
int mCurWidth = -1;
int mCurHeight = -1;
}
private SurfaceHolder mSurfaceHolder = new SurfaceHolder() {
private static final String LOG_TAG = "SurfaceHolder";
private int mSaveCount;
public boolean isCreating() {
return mIsCreating;
}
public void addCallback(Callback callback) {
synchronized (mCallbacks) {
// This is a linear search, but in practice we'll
// have only a couple callbacks, so it doesn't matter.
if (mCallbacks.contains(callback) == false) {
mCallbacks.add(callback);
}
}
}
public void removeCallback(Callback callback) {
synchronized (mCallbacks) {
mCallbacks.remove(callback);
}
}
public void setFixedSize(int width, int height) {
if (mRequestedWidth != width || mRequestedHeight != height) {
mRequestedWidth = width;
mRequestedHeight = height;
requestLayout();
}
}
public void setSizeFromLayout() {
if (mRequestedWidth != -1 || mRequestedHeight != -1) {
mRequestedWidth = mRequestedHeight = -1;
requestLayout();
}
}
public void setFormat(int format) {
mRequestedFormat = format;
if (mWindow != null) {
updateWindow(false);
}
}
public void setType(int type) {
switch (type) {
case SURFACE_TYPE_HARDWARE:
case SURFACE_TYPE_GPU:
// these are deprecated, treat as "NORMAL"
type = SURFACE_TYPE_NORMAL;
break;
}
switch (type) {
case SURFACE_TYPE_NORMAL:
case SURFACE_TYPE_PUSH_BUFFERS:
mRequestedType = type;
if (mWindow != null) {
updateWindow(false);
}
break;
}
}
public void setKeepScreenOn(boolean screenOn) {
Message msg = mHandler.obtainMessage(KEEP_SCREEN_ON_MSG);
msg.arg1 = screenOn ? 1 : 0;
mHandler.sendMessage(msg);
}
public Canvas lockCanvas() {
return internalLockCanvas(null);
}
public Canvas lockCanvas(Rect dirty) {
return internalLockCanvas(dirty);
}
private final Canvas internalLockCanvas(Rect dirty) {
if (mType == SURFACE_TYPE_PUSH_BUFFERS) {
throw new BadSurfaceTypeException(
"Surface type is SURFACE_TYPE_PUSH_BUFFERS");
}
mSurfaceLock.lock();
if (localLOGV) Log.i(TAG, "Locking canvas... stopped="
+ mDrawingStopped + ", win=" + mWindow);
Canvas c = null;
if (!mDrawingStopped && mWindow != null) {
Rect frame = dirty != null ? dirty : mSurfaceFrame;
try {
c = mSurface.lockCanvas(frame);
} catch (Exception e) {
Log.e(LOG_TAG, "Exception locking surface", e);
}
}
if (localLOGV) Log.i(TAG, "Returned canvas: " + c);
if (c != null) {
mLastLockTime = SystemClock.uptimeMillis();
return c;
}
// If the Surface is not ready to be drawn, then return null,
// but throttle calls to this function so it isn't called more
// than every 100ms.
long now = SystemClock.uptimeMillis();
long nextTime = mLastLockTime + 100;
if (nextTime > now) {
try {
Thread.sleep(nextTime-now);
} catch (InterruptedException e) {
}
now = SystemClock.uptimeMillis();
}
mLastLockTime = now;
mSurfaceLock.unlock();
return null;
}
public void unlockCanvasAndPost(Canvas canvas) {
mSurface.unlockCanvasAndPost(canvas);
mSurfaceLock.unlock();
}
public Surface getSurface() {
return mSurface;
}
public Rect getSurfaceFrame() {
return mSurfaceFrame;
}
};
}
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