动态壁纸教程 [英] Live Wallpaper Tutorial
本文介绍了动态壁纸教程的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图做从动态壁纸教程下面我发现这里。
I am trying to do the following from a live wallpaper tutorial I found here.
/**
* Do the actual drawing stuff
*/
private void doDraw(Canvas canvas) {
Bitmap b = BitmapFactory.decodeResource(context.getResources(), IMAGES[current]);
canvas.drawColor(Color.BLACK);
canvas.drawBitmap(b, 0, 0, null);
Log.d(TAG, "Drawing finished.");
}
/**
* Update the animation, sprites or whatever.
* If there is nothing to animate set the wait
* attribute of the thread to true
*/
private void updatePhysics() {
// if nothing was updated :
// this.wait = true;
if(previousTime - System.currentTimeMillis() >= 41) { //24 FPS
current = current < IMAGES.length ? current++ : 0;
}
Log.d(TAG, "Updated physics.");
}
但它似乎并没有工作。我在做什么错。 引完了。和更新的物理学。消息越来越打印。但我只看到第一张图像。我在模拟器上测试它。
But it doesn't seem to work. What am I doing wrong. The "Drawing finished." and "Updated physics." messages are getting printed. But I see the first image only. I'm testing it on the emulator.
任何帮助将是AP preciated。谢谢
Any help would be appreciated. Thanks
推荐答案
我已经做了一个简单的示例动态壁纸,其中的颜色随着时间逐渐变化。也许你可以使用它作为一个出发点:
I have worked out a simple sample live wallpaper where the color shift over time. Maybe you can use this as a starting point:
package com.cmwmobile.android.samples;
import android.graphics.Canvas;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.view.SurfaceHolder;
/**
* The SampleLiveWallpaperService class is responsible for showing the
* animation and is an interface to android.
* @author Casper Wakkers - www.cmwmobile.com
*/
public class SampleLiveWallpaperService extends WallpaperService {
private Handler handler = null;
/**
* Inner class representing the actual implementation of the
* Live Wallpaper {@link Engine}.
*/
private class SampleLiveWallpaperEngine extends Engine {
private boolean visible = false;
private int[] colors = {0, 0, 0} ;
/**
* Runnable implementation for the actual work.
*/
private final Runnable runnableSomething = new Runnable() {
/**
* {@inheritDoc}
*/
public void run() {
drawSomething();
}
};
/**
* The drawSomething method is responsible for drawing the animation.
*/
private void drawSomething() {
final SurfaceHolder holder = getSurfaceHolder();
Canvas canvas = null;
try {
canvas = holder.lockCanvas();
if (canvas != null) {
canvas.drawARGB(200, colors[0], colors[1], colors[2]);
}
updateColors(colors);
}
finally {
if (canvas != null) {
holder.unlockCanvasAndPost(canvas);
}
}
// Reschedule the next redraw.
handler.removeCallbacks(runnableSomething);
if (visible) {
// Play around with the delay for an optimal result.
handler.postDelayed(runnableSomething, 25);
}
}
/**
* Method updateColors updates the colors by increasing the value
* per RGB. The values are reset to zero if the maximum value is
* reached.
* @param colors to be updated.
*/
private void updateColors(int[] colors) {
if (colors[0] < 255) {
colors[0]++;
}
else {
if (colors[1] < 255) {
colors[1]++;
}
else {
if (colors[2] < 255) {
colors[2]++;
}
else {
colors[0] = 0;
colors[1] = 0;
colors[2] = 0;
}
}
}
}
/**
* {@inheritDoc}
*/
public void onDestroy() {
super.onDestroy();
handler.removeCallbacks(runnableSomething);
}
/**
* {@inheritDoc}
*/
public void onVisibilityChanged(boolean visible) {
super.onVisibilityChanged(visible);
this.visible = visible;
if (visible) {
drawSomething();
}
else {
handler.removeCallbacks(runnableSomething);
}
}
}
/**
* Constructor. Creates the {@link Handler}.
*/
public SampleLiveWallpaperService() {
handler = new Handler();
}
/**
* {@inheritDoc}
*/
public Engine onCreateEngine() {
return new SampleLiveWallpaperEngine();
}
}
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