我有一个用于绘制图像的SurfaceView，我想将它们叠加到手机相机的实时信息中。我看过Overlay images onto camera preview surfaceview 和how to draw an overlay on a surfaceview used by camera on android
public class TestCameraOverlayActivity extends Activity {
Bitmap bitmap;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
Preview mPreview = new Preview(this);
DrawOnTop mDraw = new DrawOnTop(this);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
setContentView(mPreview);
addContentView(mDraw, new LayoutParams (LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
}
class DrawOnTop extends View {
public DrawOnTop(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.BLACK);
canvas.drawText("Test Text", 10, 10, paint);
canvas.drawBitmap(bitmap, 0, 0, null);
super.onDraw(canvas);
}
}
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
Preview(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
mCamera.stopPreview();
mCamera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(w, h);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
}
如果你运行它，你可以在预览SurfaceView上看到图像，但我的问题是如何将它们作为jpeg保存在SD卡上。如果我需要格式转换以便我可以同时保存它们，您能给出一些建议吗？我的部分解决方案只保存图像
/** Handles data for jpeg picture */
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
FileOutputStream outStream = null;
try {
// write to local sandbox file system
// outStream = CameraDemo.this.openFileOutput(String.format("%d.jpg",
System.currentTimeMillis()), 0);
// Or write to sdcard
outStream = new FileOutputStream(String.format("/sdcard/%d.jpg",
System.currentTimeMillis()));
outStream.write(data);
outStream.close();
Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Log.d(TAG, "onPictureTaken - jpeg");
}
};
答案 0 :(得分：5)
我已根据此示例创建了以下示例代码，该示例代码将照片与叠加图像合并，然后将最终图像保存在/ sdcard / DCIM / CameraAPIDemo上。
它还集成了一个简单的应用程序，可以在这里找到： https://github.com/jiahaoliuliu/RealMadridvsBorussia
package com.jiahaoliuliu.android.futbol.realmadridvsborussia;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.renderscript.ProgramVertexFixedFunction.Constants;
import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.util.Log;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class PreviewCamera extends Activity implements OnClickListener{
private static final String LOG_TAG = PreviewCamera.class.getSimpleName();
private Bitmap bitmap;
private Preview mPreview;
private Long topPhotoLong;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
// Get the intent
Intent startedIntent = getIntent();
// Get the team
topPhotoLong = startedIntent.getLongExtra(PhotoGallery.TOP_PHOTO_ID_NAME, new Long(-1));
if (topPhotoLong > -1) {
Log.v(LOG_TAG, "The photoId is " + topPhotoLong);
bitmap = BitmapFactory.decodeResource(getResources(), topPhotoLong.intValue());
} else {
Log.w(LOG_TAG, "Photo id not found");
}
FrameLayout Game = new FrameLayout(this);
mPreview = new Preview(this);
DrawOnTop mDraw = new DrawOnTop(this);
LinearLayout GameWidgets = new LinearLayout (this);
Button EndGameButton = new Button(this);
TextView MyText = new TextView(this);
EndGameButton.setWidth(1200);
EndGameButton.setText("Take photo");
GameWidgets.addView(EndGameButton);
Game.addView(mPreview);
Game.addView(GameWidgets);
setContentView(Game);
addContentView(mDraw, new LayoutParams (LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
EndGameButton.setOnClickListener(this);
// Lock the screen to landscape
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
class DrawOnTop extends View {
public DrawOnTop(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
if (bitmap != null) {
canvas.drawBitmap(bitmap, 0, 0, null);
}
super.onDraw(canvas);
}
}
public void onClick(View v) {
Log.v(LOG_TAG, "Taking picture");
mPreview.takePicture();
}
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
Preview(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
mCamera.stopPreview();
mCamera = null;
}
public void takePicture() {
mCamera.takePicture(null, null, new PhotoHandler(getApplicationContext()));
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(w, h);
//mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
public class PhotoHandler implements PictureCallback {
private final Context context;
public PhotoHandler(Context context) {
this.context = context;
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File sdDir = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
File pictureFileDir = new File(sdDir, "/CameraAPIDemo");
if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
Log.d(LOG_TAG, "Can't create directory to save image.");
Toast.makeText(context, "Can't create directory to save image.",
Toast.LENGTH_LONG).show();
return;
}
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
String date = dateFormat.format(new Date());
String photoFile = "Picture_" + date + ".jpg";
String filename = pictureFileDir.getPath() + File.separator + photoFile;
File pictureFile = new File(filename);
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
Toast.makeText(context, "New Image saved:" + photoFile,
Toast.LENGTH_LONG).show();
// TODO: Merge the photo
try {
Bitmap bottomImage = BitmapFactory.decodeFile(pictureFile.getAbsolutePath()); //blue
bitmap = Bitmap.createBitmap(bottomImage.getWidth(), bottomImage.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bitmap);
Resources res = getResources();
Bitmap topImage = BitmapFactory.decodeResource(res, topPhotoLong.intValue()); //green
Drawable drawable1 = new BitmapDrawable(bottomImage);
Drawable drawable2 = new BitmapDrawable(topImage);
drawable1.setBounds(0, 0, bottomImage.getWidth(), bottomImage.getHeight());
drawable2.setBounds(0, 0, bottomImage.getWidth(), bottomImage.getHeight());
drawable1.draw(c);
drawable2.draw(c);
} catch (Exception e) {
}
// To write the file out to the SDCard:
OutputStream os = null;
try {
os = new FileOutputStream(filename);
bitmap.compress(Bitmap.CompressFormat.PNG, 50, os);
} catch(IOException e) {
e.printStackTrace();
}
} catch (Exception error) {
Log.d(LOG_TAG, "File" + filename + "not saved: "
+ error.getMessage());
Toast.makeText(context, "Image could not be saved.",
Toast.LENGTH_LONG).show();
}
}
}
}
答案 1 :(得分：4)
我想你问的是如何将两个图像合并为一个。
你要做的第一件事是使用AsynchHandler来保存你的图像，这样你就不会锁定UI，这不是你问题的一部分，但它会是。
关于您的一般问题，asked and answered here一般来说，您需要将两个图像部分合并在一起，并处理整个叠加层或部件图像部分的缩放。