818

在<Activity>中加入这一行android:screenOrientation="landscape/portrait "，android中每次屏幕的切换动会重启Activity，不过如果使用android:configChanges="keyboardHidden|orientation"，当我们横竖屏切换的时候会直接调用onCreate方法中的onConfigurationChanged方法，而不会重新执行onCreate方法，那当然如果不配置这个属性的话就会重新调用onCreate方法了

1.放大缩放图片大小Bitmap bitmap=null;bitmap=BitmapFactory.decodeResource(getResources(),resourcesID);int bitWidth=bitmap.getWidth();int bitHeight=bitmap.getHeight();float scaleWidth=src_width/(float)bitWidth;(src_width可以是桌面宽度)float scaleHeight=src_height/(float)bitHight;Matrix matrix=new Matrix();matrix.postScale(scaleWidth,scaleHeight);bitMap=Bitmap.createBitmap(bitmap,0,0,bitWidth,bitHeight,Matrix,true)

在surfaceView初始化函数的时候不要对ScreenW和ScreenH进行赋值，如果你在初始化调用ScreenW = this.getWidth();和ScreenH = this.getHeight();得到的值全部为0,只有SurfaceCreated()执行的时候，真正的view才会被建立

mCanvas = mHolder.lockCanvas();mCanvas.drawRect(0, 0, mScreenWidth, mScreenHeight, mPaint1);mCanvas.save();mCanvas.drawText("xlm", initX + 2, initY - 5, mPaint2);/** * mCanvas.clipRect * 是为了抠出一个小人出来，放mCanvas.drawBitmap中的图片，同时mCanvas.drawBitmap为什么要initX - * animation_image[frameCount] bitmap.getWidth() / 4, initY - 3 * * bitmap.getHeight() / 4 捏？其根本原因就是为了将bitmap左移上移，来显示出bitmap这一大张图片中的每张小图 */mCanvas.clipRect(initX, initY, initX + bitmap.getWidth() / 4, initY+ bitmap.getHeight() / 4);if (up) {mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]* bitmap.getWidth() / 4,initY - 3 * bitmap.getHeight() / 4, mPaint1);} else if (down) {mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]* bitmap.getWidth() / 4, initY, mPaint1);} else if (left) {mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]* bitmap.getWidth() / 4,initY - 1 * bitmap.getHeight() / 4, mPaint1);} else if (right) {mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]* bitmap.getWidth() / 4,initY - 2 * bitmap.getHeight() / 4, mPaint1);}mCanvas.restore();mHolder.unlockCanvasAndPost(mCanvas);

更多相关文章

随机推荐