我有SurfaceView。必须将SurfaceView上的任何内容转换为Bitmap。我搜索了很多来源。但是，我必须保留SurfaceView进行QR码筛选。也就是说，我无法将SurfaceView替换为TextureView。我需要赶时间解决这个问题。谢谢。 （我不介意使用任何现有的库）
答案 0 :(得分：0)
使用自定义相机拍摄图像时，请使用以下代码，您不需要表面视图
相机预览：
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private android.hardware.Camera mCamera;
Boolean isPreviewRunning = true;
public void startFaceDetection(){
android.hardware.Camera.Parameters params = mCamera.getParameters();
if (params.getMaxNumDetectedFaces() > 0){
mCamera.startFaceDetection();
}
}
public CameraPreview(Context context, android.hardware.Camera camera) {
super(context);
mCamera = camera;
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
startFaceDetection();
} catch (IOException e) {
Log.d("error", "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (mHolder.getSurface() == null){
return;
}
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
if (isPreviewRunning)
{
mCamera.stopPreview();
}
Camera.Parameters parameters = mCamera.getParameters();
Display display = ((WindowManager) getContext().getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0)
{
parameters.setPreviewSize(height, width);
mCamera.setDisplayOrientation(90);
}
if(display.getRotation() == Surface.ROTATION_90)
{
parameters.setPreviewSize(width, height);
}
if(display.getRotation() == Surface.ROTATION_180)
{
parameters.setPreviewSize(height, width);
}
if(display.getRotation() == Surface.ROTATION_270)
{
parameters.setPreviewSize(width, height);
mCamera.setDisplayOrientation(180);
}
try {
mCamera.setPreviewDisplay(mHolder);
previewCamera();
} catch (Exception e){
Log.d("error", "Error starting camera preview: " + e.getMessage());
}
}
public void previewCamera()
{
try
{
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
startFaceDetection();
isPreviewRunning = true;
}
catch(Exception e)
{
Log.d("preview", "Cannot start preview", e);
}
}}
Camera Activity类：
public class FrontBackCamera extends AppCompatActivity implements View.OnClickListener{
private android.hardware.Camera mCamera;
private CameraPreview mPreview;
FrameLayout preview;
RelativeLayout effect_set;
ImageView button_capture,change_camera,imagePreview,video_camera,effect_none,effect_mono,effect_negative,effect_sepia,
effect_posterize,effect_whiteboard,effect_blackboard,effect_aqua,flash_state_true,flash_state_false;
CardView button_gallery;
Boolean self_cam = true;
MediaPlayer mediaPlayer = new MediaPlayer();
String mCurrentPhotoPath;
CustomTextView current_zoom_level;
SeekBar camera_seek;
String[] effects = new String[]{
"EFFECT_NONE",
"EFFECT_MONO",
"EFFECT_NEGATIVE",
"EFFECT_SOLARIZE",
"EFFECT_SEPIA",
"EFFECT_POSTERIZE",
"EFFECT_WHITEBOARD",
"EFFECT_BLACKBOARD",
"EFFECT_AQUA"
};
String[] scenes = new String[]{
"SCENE_MODE_ACTION",
"SCENE_MODE_AUTO",
"SCENE_MODE_BARCODE",
"SCENE_MODE_BEACH",
"SCENE_MODE_CANDLELIGHT",
"SCENE_MODE_FIREWORKS",
"SCENE_MODE_HDR",
"SCENE_MODE_LANDSCAPE",
"SCENE_MODE_NIGHT",
"SCENE_MODE_NIGHT_PORTRAIT",
"SCENE_MODE_PARTY",
"SCENE_MODE_PORTRAIT",
"SCENE_MODE_SNOW",
"SCENE_MODE_SPORTS",
"SCENE_MODE_STEADYPHOTO",
"SCENE_MODE_SUNSET",
"SCENE_MODE_THEATRE"
};
HorizontalScrollView effects_slider;
Boolean effect_state = true;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera_instance);
setStatusbarTransperent();
video_camera = (ImageView) findViewById(R.id.video_camera);
effects_slider = (HorizontalScrollView) findViewById(R.id.effects_slider);
effect_none = (ImageView) findViewById(R.id.effect_none);
effect_mono = (ImageView) findViewById(R.id.effect_mono);
effect_negative = (ImageView) findViewById(R.id.effect_negative);
effect_sepia = (ImageView) findViewById(R.id.effect_sepia);
effect_posterize = (ImageView) findViewById(R.id.effect_posterize);
effect_whiteboard = (ImageView) findViewById(R.id.effect_whiteboard);
effect_blackboard = (ImageView) findViewById(R.id.effect_blackboard);
effect_aqua = (ImageView) findViewById(R.id.effect_aqua);
flash_state_true = (ImageView) findViewById(R.id.flash_state_true);
flash_state_false = (ImageView) findViewById(R.id.flash_state_false);
effect_set = (RelativeLayout) findViewById(R.id.effect_set);
preview = (FrameLayout) findViewById(R.id.camera_preview);
button_capture = (ImageView) findViewById(R.id.button_capture);
button_gallery = (CardView) findViewById(R.id.button_gallery);
change_camera = (ImageView) findViewById(R.id.change_camera);
camera_seek = (SeekBar) findViewById(R.id.camera_seek);
current_zoom_level = (CustomTextView) findViewById(R.id.current_zoom_level);
imagePreview = (ImageView) findViewById(R.id.imagePreview);
if (CommonUtil.getImagePath(FrontBackCamera.this) != null) {
imagePreview.setImageBitmap(BitmapFactory.decodeFile(CommonUtil.getImagePath(FrontBackCamera.this)));
}
mCamera = getCameraInstance(0);
mPreview = new CameraPreview(this, mCamera);
preview.addView(mPreview);
video_camera.setOnClickListener(this);
effect_set.setOnClickListener(this);
flash_state_true.setOnClickListener(this);
flash_state_false.setOnClickListener(this);
effect_none.setOnClickListener(this);
effect_mono.setOnClickListener(this);
effect_negative.setOnClickListener(this);
effect_sepia.setOnClickListener(this);
effect_posterize.setOnClickListener(this);
effect_whiteboard.setOnClickListener(this);
effect_blackboard.setOnClickListener(this);
effect_aqua.setOnClickListener(this);
button_gallery.setOnClickListener(this);
change_camera.setOnClickListener(this);
button_capture.setOnClickListener(this);
mCamera.setFaceDetectionListener(new MyFaceDetectionListener());
camera_seek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
current_zoom_level.setText(String.valueOf(progress));
zoom(progress + 1);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
if (CommonUtil.getFlashState(FrontBackCamera.this)){
flash_state_true.setVisibility(View.VISIBLE);
flash_state_false.setVisibility(View.GONE);
}else {
flash_state_true.setVisibility(View.GONE);
flash_state_false.setVisibility(View.VISIBLE);
}
}
public void setFlashOnOff(Boolean state){
Log.d("method_cam",String.valueOf(state));
if (state){
Camera.Parameters param = mCamera.getParameters();
param.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
mCamera.setParameters(param);
flash_state_true.setVisibility(View.VISIBLE);
flash_state_false.setVisibility(View.GONE);
}else {
Camera.Parameters param = mCamera.getParameters();
param.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
mCamera.setParameters(param);
flash_state_true.setVisibility(View.GONE);
flash_state_false.setVisibility(View.VISIBLE);
}
}
public void setColorEffect(String effect){
Camera.Parameters parameters = mCamera.getParameters();
switch (effect) {
case "EFFECT_NONE":
parameters.setColorEffect(Camera.Parameters.EFFECT_NONE);
break;
case "EFFECT_MONO":
parameters.setColorEffect(Camera.Parameters.EFFECT_MONO);
break;
case "EFFECT_NEGATIVE":
parameters.setColorEffect(Camera.Parameters.EFFECT_NEGATIVE);
break;
case "EFFECT_SEPIA":
parameters.setColorEffect(Camera.Parameters.EFFECT_SEPIA);
break;
case "EFFECT_POSTERIZE":
parameters.setColorEffect(Camera.Parameters.EFFECT_POSTERIZE);
break;
case "EFFECT_WHITEBOARD":
parameters.setColorEffect(Camera.Parameters.EFFECT_WHITEBOARD);
break;
case "EFFECT_BLACKBOARD":
parameters.setColorEffect(Camera.Parameters.EFFECT_BLACKBOARD);
break;
case "EFFECT_AQUA":
parameters.setColorEffect(Camera.Parameters.EFFECT_AQUA);
break;
}
mCamera.setParameters(parameters);
}
public void zoom(int zoomValue)
{
Camera.Parameters params=mCamera.getParameters();
params.setZoom(zoomValue);
mCamera.setParameters(params);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void setStatusbarTransperent(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = this.getWindow();
window.getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
public static android.hardware.Camera getCameraInstance(int camera_id){
android.hardware.Camera c = null;
try {
// change the value for selfie -> 1
c = android.hardware.Camera.open(camera_id);
}
catch (Exception e){
// Camera is not available (in use or does not exist)
}
return c;
}
private android.hardware.Camera.PictureCallback mPicture = new android.hardware.Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, android.hardware.Camera camera) {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM),"Camera");
try {
File pictureFile = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
ExifInterface exifInterface = new ExifInterface(pictureFile.getAbsolutePath());
exifInterface.getAttribute(ExifInterface.TAG_ORIENTATION);
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
mCurrentPhotoPath = pictureFile.getAbsolutePath();
CommonUtil.setImagePath(mCurrentPhotoPath,FrontBackCamera.this);
imagePreview.setImageBitmap(BitmapFactory.decodeFile(mCurrentPhotoPath));
preview.removeAllViews();
preview.addView(mPreview);
} catch (FileNotFoundException e) {
Log.d("File", "not found: " + e.getMessage());
} catch (IOException e) {
Log.d("error", "Error accessing file: " + e.getMessage());
}
}
};
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.button_gallery:
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("content://media/internal/images/media"));
startActivity(intent);
break;
case R.id.button_capture:
try {
new MediaActionSound().play(MediaActionSound.SHUTTER_CLICK);
} catch (Exception e) {
e.printStackTrace();
}
mCamera.takePicture(null, null, mPicture);
CommonUtil.setImagePath(mCurrentPhotoPath,FrontBackCamera.this);
break;
case R.id.change_camera:
mCamera.release();
decideCameraFacing();
break;
case R.id.video_camera:
mCamera.release();
startActivity(new Intent(FrontBackCamera.this,RearVideoCamera.class));
break;
case R.id.effect_none:
setColorEffect(effects[0]);
break;
case R.id.effect_mono:
setColorEffect(effects[1]);
break;
case R.id.effect_negative:
setColorEffect(effects[2]);
break;
case R.id.effect_sepia:
setColorEffect(effects[4]);
break;
case R.id.effect_posterize:
setColorEffect(effects[5]);
break;
case R.id.effect_whiteboard:
setColorEffect(effects[6]);
break;
case R.id.effect_blackboard:
setColorEffect(effects[7]);
break;
case R.id.effect_aqua:
setColorEffect(effects[8]);
break;
case R.id.flash_state_true:
CommonUtil.setFlashState(false,FrontBackCamera.this);
setFlashOnOff(false);
break;
case R.id.flash_state_false:
CommonUtil.setFlashState(true,FrontBackCamera.this);
setFlashOnOff(true);
break;
case R.id.effect_set:
if (effect_state){
effects_slider.setVisibility(View.VISIBLE);
effect_state = false;
}else {
effects_slider.setVisibility(View.GONE);
effect_state = true;
}
break;
}
}
public void decideCameraFacing(){
if (self_cam){
self_cam = false;
preview.removeAllViews();
mCamera = getCameraInstance(1);
mPreview = new CameraPreview(this, mCamera);
preview.addView(mPreview);
change_camera.setImageDrawable(getDrawable(R.drawable.camera_rear));
}else {
preview.removeAllViews();
mCamera = getCameraInstance(0);
mPreview = new CameraPreview(this, mCamera);
preview.addView(mPreview);
change_camera.setImageDrawable(getDrawable(R.drawable.camera_front));
self_cam = true;
}
}
@Override
public void onBackPressed() {
super.onBackPressed();
mCamera.release();
this.finish();
}
class MyFaceDetectionListener implements Camera.FaceDetectionListener {
@Override
public void onFaceDetection(Camera.Face[] faces, Camera camera) {
if (faces.length > 0){
Log.d("FaceDetection", "face detected: "+ faces.length +
" Face 1 Location X: " + faces[0].rect.centerX() +
"Y: " + faces[0].rect.centerY() );
}
}
}}
活动类的Xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="@+id/camera_preview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<RelativeLayout
android:id="@+id/action_layout"
android:layout_width="match_parent"
android:layout_height="@dimen/margin_80"
android:layout_alignParentBottom="true"
android:background="@color/transparent_background">
<android.support.v7.widget.CardView
android:id="@+id/button_gallery"
android:layout_width="@dimen/margin_40"
android:layout_height="@dimen/margin_40"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginStart="@dimen/margin_40"
app:cardCornerRadius="@dimen/margin_10">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="@dimen/margin_1"
app:cardCornerRadius="@dimen/margin_10">
<ImageView
android:id="@+id/imagePreview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY" />
</android.support.v7.widget.CardView>
</android.support.v7.widget.CardView>
<ImageView
android:id="@+id/button_capture"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:src="@drawable/camera_icon" />
<ImageView
android:id="@+id/change_camera"
android:layout_width="@dimen/margin_30"
android:layout_height="@dimen/margin_30"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_gravity="center"
android:layout_marginEnd="@dimen/margin_40"
android:src="@drawable/camera_front" />
</RelativeLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="@dimen/margin_15"
android:orientation="vertical">
<LinearLayout
android:id="@+id/seek_expose"
android:layout_width="@dimen/margin_32"
android:layout_height="@dimen/margin_200"
android:orientation="vertical">
<com.mycamera.view.CustomTextView
android:id="@+id/current_zoom_level"
android:layout_width="@dimen/margin_32"
android:layout_height="@dimen/margin_20"
android:gravity="center"
android:text="@string/zero"
android:textColor="@android:color/white"
android:textSize="@dimen/text_16"
app:font="@string/avenir_book" />
<FrameLayout
android:layout_width="@dimen/margin_32"
android:layout_height="@dimen/margin_180"
android:orientation="vertical">
<SeekBar
android:id="@+id/camera_seek"
android:layout_width="@dimen/margin_180"
android:layout_height="@dimen/margin_25"
android:layout_gravity="center"
android:max="5"
android:progressDrawable="@drawable/seekbar_track"
android:rotation="270"
android:splitTrack="false"
android:thumb="@drawable/seekbar_thumb" />
</FrameLayout>
</LinearLayout>
<LinearLayout
android:layout_width="@dimen/margin_32"
android:layout_gravity="center"
android:paddingBottom="@dimen/margin_20"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="@+id/flash_state_true"
android:layout_width="@dimen/margin_32"
android:layout_height="@dimen/margin_30"
android:layout_gravity="center"
android:layout_marginStart="@dimen/margin_1"
android:layout_marginTop="@dimen/margin_12"
android:src="@drawable/flash_on"
android:visibility="gone" />
<ImageView
android:id="@+id/flash_state_false"
android:layout_width="@dimen/margin_32"
android:layout_height="@dimen/margin_30"
android:layout_gravity="center"
android:layout_marginStart="@dimen/margin_1"
android:layout_marginTop="@dimen/margin_12"
android:src="@drawable/flash_off" />
<RelativeLayout
android:id="@+id/effect_set"
android:layout_width="@dimen/margin_32"
android:layout_height="@dimen/margin_35"
android:layout_marginTop="@dimen/margin_12"
android:background="@drawable/swipe_left_image_card_background">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="@dimen/margin_3"
android:src="@drawable/effect_icon" />
</RelativeLayout>
<ImageView
android:id="@+id/video_camera"
android:layout_width="@dimen/margin_32"
android:layout_height="@dimen/margin_30"
android:layout_gravity="center"
android:layout_marginStart="@dimen/margin_1"
android:layout_marginTop="@dimen/margin_12"
android:src="@drawable/ic_videocam" />
</LinearLayout>
</LinearLayout>
<HorizontalScrollView
android:id="@+id/effects_slider"
android:layout_width="match_parent"
android:layout_height="@dimen/margin_50"
android:layout_above="@+id/action_layout"
android:background="@color/transparent_background"
android:scrollbars="none"
android:visibility="gone">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:layout_margin="@dimen/margin_5"
android:orientation="horizontal">
<ImageView
android:id="@+id/effect_none"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_none" />
<ImageView
android:id="@+id/effect_mono"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_1" />
<ImageView
android:id="@+id/effect_negative"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_2" />
<ImageView
android:id="@+id/effect_sepia"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_4" />
<ImageView
android:id="@+id/effect_posterize"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_5" />
<ImageView
android:id="@+id/effect_whiteboard"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_6" />
<ImageView
android:id="@+id/effect_blackboard"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_7" />
<ImageView
android:id="@+id/effect_aqua"
android:layout_width="@dimen/margin_40"
android:layout_height="match_parent"
android:layout_marginStart="@dimen/margin_3"
android:src="@drawable/filter_8" />
</LinearLayout>
</HorizontalScrollView>
CommonUtil类
public class CommonUtil {
public static void setImagePath(String photoPath, Context context){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
final SharedPreferences.Editor editor = sharedPreferences.edit();
editor.remove("picturePath");
editor.putString("picturePath",photoPath);
editor.apply();
}
public static String getImagePath(Context context){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
return sharedPreferences.getString("picturePath",null);
}
public static void setFlashState(Boolean flash_state,Context context){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putBoolean("flash_state",flash_state);
editor.apply();
Log.d("util_flashstate",String.valueOf(flash_state));
}
public static boolean getFlashState(Context context){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
return sharedPreferences.getBoolean("flash_state",false);
}}