Question

有时候依赖于设备，onSurfaceChanged方法不止一次调用，这会导致相机预览崩溃（我正在使用camera2）。我不知道如何解决这个问题。这是我的代码的一部分：

@Override
    public synchronized void onSurfaceChanged(GL10 gl, int width, int height) {
    //  if(!(width == mWidth || height == mHeight)) {
            mWidth = width;
            mHeight= height;
            Log.e("ex1", "onSurfaceChanged = " + width + ", height = " + height);

            //generate camera texture------------------------
            setupSurfaceTexture(width, height);
            surfaceIsDestroyed = false;
        //}

    }

private void setupSurfaceTexture(final int width,final int height) {
       System.out.println("setupSurfaceTexture is being called");
        mCameraTexture.init();

        //set up surface texture------------------
        SurfaceTexture oldSurfaceTexture = mSurfaceTexture;
        mSurfaceTexture = new SurfaceTexture(mCameraTexture.getTextureId());
        mSurfaceTexture.setOnFrameAvailableListener(this);
        if(oldSurfaceTexture != null) {
            oldSurfaceTexture.release();
        }

        //get the camera orientation and display dimension, open camera------------
        int orientation = mContext.getResources().getConfiguration().orientation;

        float rotation = 90; 
        if((orientation == 1) && (newApi)) { // TODO: NEED TO BE CHANGED
            isPortrait = true;
            rotation = 0; 
        }
        icam.openCamera(width, height, mSurfaceTexture);
        System.out.println("Is new API: " + newApi);

        if(mContext.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
            Matrix.setRotateM(mOrientationM, 0, rotation, 0f, 0f, 1f);
            if(newApi) {
                icam.updateScaling(width, height, isPortrait);
                mRatio[0] = icam.getCameraWidthOrScaleX();
                mRatio[1] = icam.getCameraHeightOrScaleY();
            } else {
                icam.updateScaling(width, height, isPortrait);
                mRatio[0] = icam.getCameraWidthOrScaleX();// * 1.0f/height;
                mRatio[1] = icam.getCameraHeightOrScaleY();// * 1.0f/width;
            }

        } else {
            Matrix.setRotateM(mOrientationM, 0, rotation, 0f, 0f, 1f);
            if(newApi) {
                mRatio[1] = icam.getCameraWidthOrScaleX();
                mRatio[0] = icam.getCameraHeightOrScaleY();
            } else {
                mRatio[1] = icam.getCameraWidthOrScaleX();//*1.0f/height;
                mRatio[0] = icam.getCameraHeightOrScaleY();//*1.0f/width;
            }
        }
        Log.d("Rotation Portrait", mRatio[0] + "-----" + mRatio[1]);

        //start render-----
        requestRender();
        surfaceSetuped = true;
}

Answer 1

建议 harvey-slash 时，您可能无法在第二次调用onSurfaceChanged()时重新初始化所有内容。表面的大小已经改变了 - 那又怎样？您可以选择更好地设置适合新宽高比的预览尺寸，或者强制布局适合您之前设置的预览尺寸（get LayoutParams并设置负边距）。

另一个棘手的情况是，对onSurfaceChanged()的重复调用是设备方向改变的结果。但即便如此，您仍可继续重复使用相机。

如何在调用onSurfaceChanged方法两次时处理代码

1 个答案: