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這篇文章主要介紹“Android SurfaceView預(yù)覽變形怎么解決”,在日常操作中,相信很多人在Android SurfaceView預(yù)覽變形怎么解決問(wèn)題上存在疑惑,小編查閱了各式資料,整理出簡(jiǎn)單好用的操作方法,希望對(duì)大家解答”Android SurfaceView預(yù)覽變形怎么解決”的疑惑有所幫助!接下來(lái),請(qǐng)跟著小編一起來(lái)學(xué)習(xí)吧!
看下面這個(gè)回調(diào):
@Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Log.i(TAG, "surfaceChanged: " + width + " " + height); }
從上面的回調(diào)打印的數(shù)據(jù)知道其實(shí)取相近的比例解決不了根本問(wèn)題。
所以,對(duì)于此類的解決方法我只想說(shuō)僅僅相近有神馬用。
那么既然知道surfaceChanged的寬高就是SurfaceView的渲染寬高,那么想辦法把surfaceChanged里的寬高比弄成和camera比例一樣不就行了嘛,所以看SurfaceView的源碼:
protected void updateWindow(boolean force, boolean redrawNeeded) { ...代碼省略 int myWidth = mRequestedWidth; if (myWidth <= 0) myWidth = getWidth(); int myHeight = mRequestedHeight; if (myHeight <= 0) myHeight = getHeight(); ...代碼省略 if (creating || formatChanged || sizeChanged || visibleChanged || realSizeChanged) { if (DEBUG) Log.i(TAG, System.identityHashCode(this) + " " + "surfaceChanged -- format=" + mFormat + " w=" + myWidth + " h=" + myHeight); if (callbacks == null) { callbacks = getSurfaceCallbacks(); } for (SurfaceHolder.Callback c : callbacks) { c.surfaceChanged(mSurfaceHolder, mFormat, myWidth, myHeight); } } ...代碼省略 }
可以看到寬高其實(shí)就是調(diào)用的View的getHeight和getWidth或者是mRequestedWidth和mRequestedHeight。
熟悉了View的自定義就知道getHeight和getWidth都是和View的onMeasure息息相關(guān),所以想到重寫(xiě)onMeasure方法。
再?gòu)脑创a看到關(guān)于mRequestedWidth和mRequestedHeight的賦值
@Override public void setFixedSize(int width, int height) { if (mRequestedWidth != width || mRequestedHeight != height) { mRequestedWidth = width; mRequestedHeight = height; requestLayout(); } }
以下是完整類代碼:
public class ResizeAbleSurfaceView extends SurfaceView { private int mWidth = -1; private int mHeight = -1; public ResizeAbleSurfaceView(Context context) { super(context); } public ResizeAbleSurfaceView(Context context, AttributeSet attrs) { super(context, attrs); } public ResizeAbleSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (-1 == mWidth || -1 == mHeight) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); } else { setMeasuredDimension(mWidth, mHeight); } } public void resize(int width, int height) { mWidth = width; mHeight = height; getHolder().setFixedSize(width, height); requestLayout(); invalidate(); } }
實(shí)例化的時(shí)候記得調(diào)用resize方法就好了。
注意和camera的預(yù)覽尺寸比例一致,且寬高記得傳正確,不然可能不全屏
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