我一直在尝试用开机动画制作一个简单的动态壁纸。所以基本上我的可绘制文件夹中有大约 50 个 .png。我可以将动画设置为大约 10-20 帧，效果很好。但是一旦我将其设置为大约 30 帧...我就会收到 OutOfMemory 错误。我希望也许有人可以看一下我的代码，并举例说明如何实现更多框架？这会有很大帮助，我已经研究了几个小时了> <
这是我的代码:
package com.androidnetwork.animlivewp;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.os.Handler;
import android.os.SystemClock;
import android.service.wallpaper.WallpaperService;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
public class AnimatedLiveWallpaper extends WallpaperService {
private final Handler mHandler = new Handler();
@Override
public void onCreate() {
super.onCreate();
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public Engine onCreateEngine() {
return new CubeEngine();
}
class CubeEngine extends Engine {
private final Paint mPaint = new Paint();
private float mPosY;
private boolean mAnime = true;
private Matrix mMatrix = new Matrix();
private final Runnable mDrawAnim = new Runnable() {
public void run() {
drawFrame();
}
};
private boolean mVisible;
private static final int NUM_RES = 30;
private final Bitmap[] mPics = new Bitmap[NUM_RES];
CubeEngine() {
Resources res = getResources();
for (int i = 0; i< NUM_RES; i++) {
int id = res.getIdentifier("boot_00" + (100 + (i + 1)), "drawable", "com.androidnetwork.animlivewp");
mPics[i] = BitmapFactory.decodeResource(res, id);
}
}
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
super.onCreate(surfaceHolder);
setTouchEventsEnabled(false);
}
@Override
public void onDestroy() {
super.onDestroy();
mHandler.removeCallbacks(mDrawAnim);
}
@Override
public void onVisibilityChanged(boolean visible) {
mVisible = visible;
if (visible) {
drawFrame();
} else {
mHandler.removeCallbacks(mDrawAnim);
}
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
super.onSurfaceChanged(holder, format, width, height);
float w = mPics[0].getWidth();
float h = mPics[0].getHeight();
float s = width / (float)w;
mMatrix.reset();
mMatrix.setScale(s, s);
mPosY = (height - (h * s)) / 2f;
drawFrame();
}
@Override
public void onSurfaceCreated(SurfaceHolder holder) {
super.onSurfaceCreated(holder);
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
mVisible = false;
mHandler.removeCallbacks(mDrawAnim);
}
@Override
public void onOffsetsChanged(float xOffset, float yOffset,
float xStep, float yStep, int xPixels, int yPixels) {
drawFrame();
}
@Override
public void onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE) {
mAnime = !mAnime;
}
super.onTouchEvent(event);
}
void drawFrame() {
final SurfaceHolder holder = getSurfaceHolder();
Canvas c = null;
try {
c = holder.lockCanvas();
if (c != null) {
// draw something
drawAnim(c);
//drawTouchPoint(c);
}
} finally {
if (c != null) holder.unlockCanvasAndPost(c);
}
// Reschedule the next redraw
mHandler.removeCallbacks(mDrawAnim);
if (mVisible && mAnime) {
mHandler.postDelayed(mDrawAnim, 1000 / 10);
}
}
private int idx = 0;
void drawAnim(Canvas c) {
c.save();
c.translate(0, mPosY);
c.drawBitmap(mPics[idx], mMatrix, mPaint);
if (mAnime) ++idx;
if (idx == NUM_RES) idx = 0;
c.restore();
}
}
}
如果有帮助的话，这里有一个 logcat:
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): FATAL EXCEPTION: main
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.Bitmap.nativeCreate(Native Method)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.Bitmap.createBitmap(Bitmap.java:468)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.Bitmap.createBitmap(Bitmap.java:435)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:340)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:488)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:462)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:323)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:346)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:372)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at com.androidnetwork.animlivewp.AnimatedLiveWallpaper$CubeEngine.<init>(AnimatedLiveWallpaper.java:55)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at com.androidnetwork.animlivewp.AnimatedLiveWallpaper.onCreateEngine(AnimatedLiveWallpaper.java:32)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:814)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.os.Handler.dispatchMessage(Handler.java:99)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.os.Looper.loop(Looper.java:123)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at java.lang.reflect.Method.invokeNative(Native Method)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at java.lang.reflect.Method.invoke(Method.java:521)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-22 19:45:05.508: ERROR/AndroidRuntime(12277): at dalvik.system.NativeStart.main(Native Method)
最佳答案
每次绘制 Canvas 时，仅创建一个位图并重新加载每个 png。例如，创建一个简单的例程，将每个图像重新加载到相同的位图分配中。我还建议您将 png 文件转换为 jpg 文件，因为 png 是无损格式。使用 jpg，您可以稍微压缩每一帧。
public void updateBG() {
idx += 1;
if (idx == NUM_RES) {idx = 0;}
switch (bgcycle) {
case 0: myBg = BitmapFactory.decodeResource(getResources(),R.drawable.frame1); break;
case 1: myBg = BitmapFactory.decodeResource(getResources(),R.drawable.frame2); break;
case 2: myBg = BitmapFactory.decodeResource(getResources(),R.drawable.frame3); break;
case etc....
}}
或者我想如果你想链接到启动动画，你可以使用这个
int id = res.getIdentifier("boot_00" + (100 + (idx + 1)), "drawable", "com.androidnetwork.animlivewp");
myBg = BitmapFactory.decodeResource(res, id);
然后在您的 DrawAnim 代码中
updateBG();
c.drawBitmap(myBg, mMatrix, null);
关于java - 当我的动态壁纸超过 30 帧时出现内存不足错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3563693/