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我寫了一個類相機預覽我怎樣才能顯示我的攝像頭預覽
public class CameraView extends SurfaceView implements SurfaceHolder.Callback{
private Camera camera;
public CameraView(Context context) {
super(context);
getHolder().addCallback(this);
getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public static void setCameraDisplayOrientation(Activity activity, int cameraId, Camera camera){
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(cameraId, info);
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
int degrees = 0;
switch (rotation){
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
}
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360;
}else{
result = (info.orientation - degrees + 360) % 360;
}
camera.setDisplayOrientation(result);
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
camera = Camera.open();
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
setCameraDisplayOrientation((Activity)getContext(), Camera.CameraInfo.CAMERA_FACING_BACK, camera);
Camera.Parameters parameters = camera.getParameters();
Camera.Size bestSize = null;
for (Camera.Size size : parameters.getSupportedPictureSizes()){
if (size.width <= i1 && size.height <=i2) {
if (bestSize == null) {
bestSize = size;
} else {
int bestArea = bestSize.width * bestSize.height;
int newArea = size.width * size.height;
if (newArea > bestArea){
bestSize = size;
}
}
}
}
parameters.setPictureSize(bestSize.width, bestSize.height);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
camera.setParameters(parameters);
try{
camera.setPreviewDisplay(surfaceHolder);
}catch (IOException e){
e.printStackTrace();
}
camera.startPreview();
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
camera.stopPreview();
camera.release();
camera = null;
}
}
然後我寫了一個佈局文件，我想在「SurfaceView」顯示預覽
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/camera_view" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_alignParentBottom="true"
android:weightSum="1">
<Button
android:id="@+id/stop_navigation"
android:layout_weight="0.5"
android:layout_height="32dp"
android:layout_width="0dp"
android:text="@string/stop_navigation"
android:textColor="@color/colorWhite"
android:textSize="12sp"
android:background="@color/colorAccent" />
</LinearLayout>
</RelativeLayout>
那麼我應該怎麼做主要活動呢？在我做下面的代碼之前，一切都很好。
CameraView cameraView = new CameraView(this);
addContentView(cameraView, new ActionBar.LayoutParams(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT));
但現在我需要將預覽放入我設計的佈局中。
如果我這樣做，我需要更改我的CameraView構造像這樣：public CameraView（上下文上下文，AttributeSet屬性集）{super（context，attributeSet）; ... }我不確定在主要活動中我應該爲attributeSet傳遞什麼參數。 – OtakuFitness
是的，你是對的..但你必須在你的class中使用一個或多個構造函數。保持原來的構造函數不變，並用attributeSet添加新的構造函數，最後在Main活動中使用舊的構造函數。 –
或者如果您想使用surfaceView使用自定義相機，請點擊此鏈接： - http://www.c-sharpcorner.com/UploadFile/9e8439/how-to-make-a-custom-camera-ion-android/ –