如何正確設置Android相機方向？我想根據Android中的設備方向設置相機方向，但似乎沒有任何效果。我嘗試旋轉Surface以及相機參數，但是縱向模式下的相機預覽總是顛倒過來。我需要順時針旋轉90度才能使其正確。這是我現在使用的代碼，僅適用于橫向模式。 SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
initCamera();
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.2;
double targetRatio = (double) w / h;
if (sizes == null)
return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
for (Size size : sizes) {
Log.d(TAG, "Checking size " + size.width + "w " + size.height + "h");
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio, ignore the
// requirement
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
3 回答
慕勒3428872
TA貢獻1848條經驗 獲得超6個贊
此解決方案適用于所有 Android版本。您可以在Java中使用反射使其適用于所有Android設備：
基本上你應該創建一個反射包裝來調用Android 2.2 setDisplayOrientation，而不是調用特定的方法。
方法：
protected void setDisplayOrientation(Camera camera, int angle){
Method downPolymorphic;
try
{
downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
if (downPolymorphic != null)
downPolymorphic.invoke(camera, new Object[] { angle });
}
catch (Exception e1)
{
}}而不是使用camera.setDisplayOrientation（x）使用setDisplayOrientation（camera，x）：
if (Integer.parseInt(Build.VERSION.SDK) >= 8)
setDisplayOrientation(mCamera, 90);
else
{
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
{
p.set("orientation", "portrait");
p.set("rotation", 90);
}
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)
{
p.set("orientation", "landscape");
p.set("rotation", 90);
}
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