6

我正在使用这篇文章从相机捕获图像并在活动中显示的 jengelsma 代码从相机获取图像。

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。

我假设这只是预览大小，但是我无法找到返回大图像，因为我需要它来操作它。

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);
    }  
} 
}

非常感谢任何帮助。

4

2 回答 2

19

您必须做一些额外的工作才能获得全尺寸图片，它不会将其传递到 Intent 中，而是将其存储在文件中。

要为此启动相机，请在您的 Intent 中添加一个额外的内容：

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，但是您喜欢修改命名。

getData()然后在您的 onActivityResult 中，您只需调用Intent即可获取图片的 URI 。

于 2012-10-21T18:23:55.650 回答
2

相机的开始意图

private void takeFromCamera() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
            File exportDir = new File(Environment.getExternalStorageDirectory(), "TempFolder");
            if (!exportDir.exists()) {
                exportDir.mkdirs();
            }

            String fileName = "/" + UUID.randomUUID().toString().replaceAll("-", "") + ".jpg";
            mTempCameraPhotoFile = new File(exportDir,fileName);
            Log.d(LOG_TAG, fileName);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mTempCameraPhotoFile));
            startActivityForResult(takePictureIntent, REQUEST_CAMERA);
        }
    }

在 onActivityResult 中捕获结果

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == Activity.RESULT_OK) {

        if  (requestCode == REQUEST_CAMERA) {


            if (requestCode == REQUEST_CAMERA) {
                String filePath = mTempCameraPhotoFile.getPath();
                Log.d(LOG_TAG, filePath);

                /*
                // extracted file path can be load into imageview for example with Picasso loader
                Uri uri = Uri.fromFile(new File(mReportImageList.get(position).getUrl()));
                Picasso.with(mContext)
                        .load(uri)
                        .fit()
                        .centerCrop()
                        .into(ivPhoto);*/


            }
        }
    }
}

在清单中

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
于 2015-05-08T12:26:54.613 回答