android: Take camera picture without “save” / “del

问题:

I want to display an image taken from the camera in an ImageView using

Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

This works fine so far but after the user takes the photo using the chosen camera app a dialog (probably from the app) appears asking whether to save or delete the taken picture (at least on Android 2.3 and 4.2 using the default camera app).

I would like to skip this extra dialog and directly display the image in the ImageView (when onActivityResult gets called), because it means an extra interaction step for the user, which is unneccessary because he will have the possibilty to save or delete the photo in my app.

Is this possible using the simple ACTION_IMAGE_CAPTURE Intent or will I need something more complex like Camera Preview and SurfaceView for this purpose ?

回答1:

You ca use the SurfaceView to capture image

package com.camera;

import java.io.IOException;

import android.app.Activity;
import android.content.Intent;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class Camera_capture extends Activity implements SurfaceHolder.Callback {

private Camera mCamera;
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private Button capture_image;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.camera_layout);
    capture_image = (Button) findViewById(R.id.capture_image);
    capture_image.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            capture();
        }
    });
    surfaceView = (SurfaceView) findViewById(R.id.surfaceview);
    surfaceHolder = surfaceView.getHolder();
    surfaceHolder.addCallback(Camera_capture.this);
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    try {
        mCamera = Camera.open();
        mCamera.setPreviewDisplay(surfaceHolder);
        mCamera.startPreview();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void capture() {
    mCamera.takePicture(null, null, null, new Camera.PictureCallback() {

        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            Toast.makeText(getApplicationContext(), "Picture Taken",
                    Toast.LENGTH_SHORT).show();
            Intent intent = new Intent();
            intent.putExtra("image_arr", data);
            setResult(RESULT_OK, intent);
            camera.stopPreview();
            if (camera != null) {
                camera.release();
                mCamera = null;
            }
            finish();
        }
    });
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    Log.e("Surface Changed", "format   ==   " + format + ",   width  ===  "
            + width + ", height   ===    " + height);
    try {
        mCamera.setPreviewDisplay(holder);
        mCamera.startPreview();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    Log.e("Surface Created", "");
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    Log.e("Surface Destroyed", "");
}

@Override
protected void onPause() {
    super.onPause();
    if (mCamera != null) {
        mCamera.stopPreview();
        mCamera.release();
    }
}
}

And the layout file would be

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<SurfaceView
    android:id="@+id/surfaceview"
    android:layout_width="fill_parent"
    android:layout_weight="100"
    android:layout_height="wrap_content" />

<Button
    android:id="@+id/capture_image"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="Capture" />

</LinearLayout>

Start this Camera_capture activity with startActivityForResult and onActivityResult you can get the image as byte array as

byte[] image = data.getExtras().getByteArray("image_arr");

where data is the received data.

Decode the byte array to Bitmap using

Bitmap bmp = BitmapFactory.decodeByteArray(image, 0,
                    image.length);

now set this Bitmap

---

Edit

As there is some problem while returning byte[], the byte[] should be save in a file and the path of the file should be sent to the previous Activity so that file can be read.

In onPictureTaken(), just add

String PATH = "Any path to store a file";
try {
    FileOutputStream fos=new FileOutputStream(PATH);

    fos.write(data);
    fos.close();
  }
  catch (java.io.IOException e) {

  }

and in place of :

intent.putExtra("image_arr", data);

write

intent.putExtra("image_path", PATH);

and receive this path in previous Activity's onActivityResult as :

String imagePath = data.getExtras().getString("image_path");

回答2:

Use "android.intent.extra.quickCapture"

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra("android.intent.extra.quickCapture",true);
if (intent.resolveActivity(getPackageManager()) != null) {
    startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
}

回答3:

If your image is rotated, you can use this:

mCamera.setDisplayOrientation(90);

after

mCamera.startPreview();

回答4:

You can not do it using the default intent. You will have to write a customer camera capture functionality where you can skip the preview with Ok and Cancel buttons.

Pleas see http://developer.android.com/guide/topics/media/camera.html#custom-camera

回答5:

You can use the solution of AnujMathur_07, but if you do not want work with paths and files, in the method onPictureTaken, you can return the bitmap:

 @Override
            public void onPictureTaken(byte[] data, Camera camera) {
                Toast.makeText(getApplicationContext(), "Picture Taken",
                        Toast.LENGTH_SHORT).show();
                Intent intent = new Intent();

            Bitmap bmp = BitmapFactory.decodeByteArray(data, 0,
                    data.length);

            intent.putExtra("image", bmp);
            setResult(RESULT_OK, intent);
            camera.stopPreview();
            if (camera != null) {
                camera.release();
                mCamera = null;
            }
            finish();
        }

And in the method onActivityResult you can get bitmap:

 Bundle extras = data.getExtras();
 Bitmap imageBitmap = (Bitmap) extras.get("image");

回答6:

Use MediaStore.EXTRA_OUTPUT param for you camera application running intent

intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);