如何让Android Camera Intent返回全尺寸图片

Question

我正在使用此帖子中的jengelsma代码从相机中捕获图像和在活动中显示以从相机获取图像.

当我得到返回的图像时,它很小,当我尝试扩展它时,我立即失去了图像质量.

我认为这只是预览尺寸,但是我无法找到返回大图像,因为我需要它来操纵它.

供参考,代码是:

package edu.gvsu.cis.masl.camerademo;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MyCameraActivity extends Activity {
private static final int CAMERA_REQUEST = 1888; 
private ImageView imageView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    this.imageView = (ImageView)this.findViewById(R.id.imageView1);
    Button photoButton = (Button) this.findViewById(R.id.button1);
    photoButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
            startActivityForResult(cameraIntent, CAMERA_REQUEST); 
        }
    });
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {  
        Bitmap photo = (Bitmap) data.getExtras().get("data"); 
        imageView.setImageBitmap(photo);
    }  
} 
}

任何帮助非常感谢.

Answer 1

你必须做一些额外的工作来获得一个完整的图片,它不会在Intent中传递它,而是将它存储在一个文件中.

要为此启动相机,请为您的Intent添加额外内容:

Intent intent = new Intent( MediaStore.ACTION_IMAGE_CAPTURE );

fileUri = getOutputMediaFileUri();
intent.putExtra( MediaStore.EXTRA_OUTPUT, fileUri );

getOutputMediaFileUri看起来像:

/** Create a file Uri for saving an image or video */
private static Uri getOutputMediaFileUri(){
  return Uri.fromFile(getOutputMediaFile());
}

/** Create a File for saving an image or video */
private static File getOutputMediaFile(){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.

    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
          Environment.DIRECTORY_PICTURES), "MyCameraApp");
    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            Log.d("MyCameraApp", "failed to create directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "IMG_"+ timeStamp + ".jpg");

    return mediaFile;
}

当然,您可以修改创建文件的方法,但是您想修改命名.

然后在你的onActivityResult中,只需调用getData()Intent 即可获得图片的URI .