我正在使用这篇文章中的 jengelsma 代码 Capture Image from Camera and Display in Activity从相机获取图像。
当我得到返回的图像时,它很小,当我试图扩大它时,我立即失去了图像质量。
我假设这只是预览尺寸,但是我无法找到返回大图像的方法,因为这是我需要的才能对其进行操作。
供引用的代码是:
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。
最佳答案
你必须做一些额外的事情来获得全尺寸图片,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。
然后在您的 onActivityResult 中,您只需在 Intent 上调用 getData()
即可获取图片的 URI。
关于android - 如何让Android Camera Intent返回全尺寸图片,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13000651/