[英]Android - canvas drawBitmap and different resolutions?
我在畫布上繪制例如兩個位圖時遇到了這個問題(用於動態壁紙)。 問題是,位於前面的小位圖應准確放置在背景位圖的正確位置。 當然,在仿真器上看起來不錯(假設分辨率為480x800)。 但是,當我在手機(800x1280分辨率)上進行檢查時,它不合適。
我試圖用這個:
int pixel = 120;
final float scale = getResources().getDisplayMetrics().density;
int dip = (int) (pixel* scale + 0.5f);
而不是硬像素,但效果也不好。 下面是整個類代碼:
public class DemoWallpaperService extends WallpaperService {
@Override
public Engine onCreateEngine() {
return new DemoWallpaperEngine();
}
private class DemoWallpaperEngine extends Engine {
private boolean mVisible = false;
private final Handler mHandler = new Handler();
int x=0,y=0,a=255,i=-1, a1=255, i1=-1;
float r=0,rs=1;
float rx1=10, rxs=-1;
private Matrix mMatrix = new Matrix();
private Matrix mMatrix1 = new Matrix();
private Matrix mMatrixRotate1 = new Matrix();
private Matrix mMatrixRotate2 = new Matrix();
public Bitmap spaceShip = BitmapFactory.decodeResource(getResources(), R.drawable.spaceship);
public Bitmap background= BitmapFactory.decodeResource(getResources(), R.drawable.back2short2j);
public Bitmap wyspa= BitmapFactory.decodeResource(getResources(), R.drawable.wyspa22g);
public Bitmap ksiezyc = BitmapFactory.decodeResource(getResources(), R.drawable.ksiezyc);
public Bitmap reflektorfront= BitmapFactory.decodeResource(getResources(), R.drawable.reflektorwyspa);
private float mPixels;
private float mPixels1;
private final Runnable mUpdateDisplay = new Runnable() {
@Override
public void run() {
draw();
}};
private void draw() {
SurfaceHolder holder = getSurfaceHolder();
Canvas c = null;
Display d = ((WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int wx= d.getWidth();
int wy= d.getHeight();
try {
Runtime.getRuntime().gc();
c = holder.lockCanvas();
c.save();
if (c != null) {
Paint paintMoon = new Paint();
if(a1<=15){
i1=1;
}
else if(a1>=255){
i1=-1;
}
a1+=5*i1;
paintMoon.setAlpha(a1);
c.translate((float)mPixels, 0f);
c.drawBitmap(background, mMatrix, null);
c.drawBitmap(ksiezyc, 1027*wx/480,15*wy/800, paintMoon);
if(rx1<=-15){
rxs=1;
}
else if(rx1>=15){
rxs=-1;
}
rx1+=rxs*0.7;
c.translate((float)mPixels1, 0f);
//reflektor wyspa back
mMatrixRotate2.setTranslate(340*wx/480,300*wy/800);
mMatrixRotate2.preRotate(rx1,reflektorfront.getWidth()/2,20);
c.drawBitmap(reflektorfront, mMatrixRotate2, null);
c.drawBitmap(wyspa, mMatrix1, null);
if(r<=-15){
rs=1;
}
else if(r>=15){
rs=-1;
}
r+=rs*0.5;
mMatrixRotate1.setTranslate(160*wx/480,380*wy/800);
mMatrixRotate1.preRotate(r,reflektorfront.getWidth()/2,20);
c.drawBitmap(reflektorfront, mMatrixRotate1, null);
if(x<c.getWidth()){
x+=3;}
else{x=0;}
if(y<c.getHeight()){
y+=3;}
else{y=0;}
Paint paint = new Paint();
if(a<=5){
i=1;
}
else if(a>=255){
i=-1;
}
a+=10*i;
paint.setAlpha(a);
c.drawBitmap(spaceShip,x,y,paint);
c.restore();
}
} finally {
if (c != null)
holder.unlockCanvasAndPost(c);
}
mHandler.removeCallbacks(mUpdateDisplay);
if (mVisible) {
mHandler.postDelayed(mUpdateDisplay, 10);
}
}
@Override
public void onOffsetsChanged(float xOffset, float yOffset,
float xStep, float yStep, int xPixels, int yPixels){
super.onOffsetsChanged(xOffset, yOffset, xStep, yStep, xPixels, yPixels);
mPixels = xPixels*7/4;
mPixels1 = 500+xPixels;
draw();
}
@Override
public void onVisibilityChanged(boolean visible) {
mVisible = visible;
if (visible) {
draw();
} else {
mHandler.removeCallbacks(mUpdateDisplay);
}
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
super.onSurfaceChanged(holder, format, width, height);
float w = background.getWidth();
float h = background.getHeight();
float s = height / (float)h;
float z = height / (float)h;
mMatrix.reset();
mMatrix1.reset();
mMatrixRotate1.reset();
mMatrixRotate2.reset();
mMatrix.setScale(s, s);
mMatrix1.setScale(z, z);
mMatrixRotate1.setScale(s, s);
draw();
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
mVisible = false;
mHandler.removeCallbacks(mUpdateDisplay);
}
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
super.onCreate(surfaceHolder);
setTouchEventsEnabled(false);
}
@Override
public void onDestroy() {
super.onDestroy();
mVisible = false;
mHandler.removeCallbacks(mUpdateDisplay);
}
}
因此,如果可以的話,請幫助任何人。
使用ViewTreeObserver
來測量視圖/屏幕尺寸,並將位圖與生成的坐標一起放置。
這是一個示例代碼,用於測量布局的寬度和高度
final RelativeLayout mainLayout = (RelativeLayout) findViewById(R.id.main_layout);
ViewTreeObserver vto = mainLayout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
final int viewWidth = mainLayout.getMeasuredWidth();
final int viewHeight = mainLayout.getMeasuredHeight();
if (Constants.LOG_ENABLED) {
Log.i(TAG, "Width: " + viewWidth);
Log.i(TAG, "Height: " + viewHeight);
}
/**
* Delete tree observer
*/
ViewTreeObserver obs = mainLayout.getViewTreeObserver();
obs.removeGlobalOnLayoutListener(this);
}
});
獲取密度
DisplayMetrics metrics; metrics = new DisplayMetrics(); metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); float density = metrics.density;
像這樣申請
Canvas canvas = new Canvas(bitmap); canvas.drawBitmap(ksiezyc, density * wx,density * wy, paintMoon);
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