保存图片并在图像视图中加载

Posted 2023-05-07

【中文标题】保存图片并在图像视图中加载

【英文标题】：Saving picture and loading in an imageview

【发布时间】：2014-02-23 22:14:44

【问题描述】：

如果我拍照，它会显示在图像视图中。这很好用。但是如何将照片额外保存在硬盘上？拿他相机设置的大小？

public class Note  extends Activity 

TextView t;
ImageView iv;

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.note);
   iv=(ImageView) findViewById(R.id.imageView);

    Button btn = (Button) findViewById(R.id.photo);
    btn.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(intent, 0);
        
    );



public void button (View view)
    Intent intent = new Intent(view.getContext(),Note2.class);
    startActivityForResult(intent, 0);




@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    if(requestCode==0)
    
    Bitmap theImage = (Bitmap) data.getExtras().get("data");
        iv.setImageBitmap(theImage);

    

提前感谢您的帮助。

【参考方案1】：

制作 uri 和文件

public File mediaFile;
public Uri fileUri;

把这两个方法放到你的文件里

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

    /** Create a File for saving an image or video */
    private static File getOutputMediaFile(int type)
        // 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), "YourFolderName");
        // 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())
                Toast.makeText(null, "failed to create directory", Toast.LENGTH_SHORT).show();
                return null;
            
        




        if (type == 1)
              Long tsLong = System.currentTimeMillis()/1000;
              String ts = tsLong.toString();
            mediaFile = new File(mediaStorageDir.getPath() + File.separator +
            "photo"+ ts + ".jpg");

         
         else 
            return null;
        

        return mediaFile;
    

然后在你开始之前ActivityForResult(intent, 0);放：

fileUri = getOutputMediaFileUri(1);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
            intent.putExtra("return-data", true);

确保在清单中输入：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>