存储压缩图像

Question

我可以将图像保存在内部存储器中，但无法存储压缩图像。

这是我的Java代码

我用getFileUri（）将图像存储在手机中的图片目录，我使用的getImage字节（）压缩文件，但我没有得到任何错误我也无法压缩图像。我能够保存正常的图像，但我无法保存压缩。

public class MainActivity extends AppCompatActivity implements View.OnClickListener { 

    private static final String TAG = "MainActivity"; 
    private Button button, buttonCompress; 
    private String encoded_string, image_name; 
    private Bitmap bitmap; 
    private ImageView img; 
    private File file; 
    private Uri file_uri; 
    private ProgressDialog mProgressDialog; 
    Intent data; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     ActivityCompat.requestPermissions(this, new String[] 
       {android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);//For writing into internal storage. 

     img = (ImageView) findViewById(R.id.imageView); 
     button = (Button) findViewById(R.id.btnCam); 
     buttonCompress = (Button) findViewById(R.id.btnComp); 
     button.setOnClickListener(this); 
     buttonCompress.setOnClickListener(this); 

    } 

    @Override 
    public void onClick(View view) { 
     switch (view.getId()) { 
      case R.id.btnCam: 
       Intent intentCamera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       getFileUri(); 
       intentCamera.putExtra(MediaStore.EXTRA_OUTPUT, file_uri); 
       startActivityForResult(intentCamera, 10); 
       break; 
      case R.id.btnComp: 
       getImageBytes(img); 
       getFileUri(); 
       break; 
     } 

    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 

     if (requestCode == 10 && resultCode == RESULT_OK) { 
      img.setImageURI(file_uri); 
      Log.d("path is", file.getPath()); 
      Toast.makeText(MainActivity.this, "Successfully Written !!", Toast.LENGTH_SHORT).show(); 
     } 
    } 

    private void getFileUri() { 
     image_name = "picture1.jpg"; 
     file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) 
       + File.separator + image_name 
     ); 
     file_uri = Uri.fromFile(file); 
     Log.d("uri is", file_uri.toString()); 
    } 


    private byte[] getImageBytes(@NonNull ImageView imageView) { 
     Bitmap bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap(); 
     ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
     bitmap.compress(Bitmap.CompressFormat.JPEG, 50, bos); 
     return bos.toByteArray(); 
    } 
} 

这是我的XML文件

<ImageView 
    android:id="@+id/imageView" 
    android:layout_width="257dp" 
    android:layout_height="300dp" 
    app:srcCompat="@mipmap/ic_launcher" 
    tools:layout_editor_absoluteX="32dp" 
    tools:layout_editor_absoluteY="98dp" 
    android:adjustViewBounds="true" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" /> 

<Button 
    android:id="@+id/btnCam" 
    android:layout_width="94dp" 
    android:layout_height="36dp" 
    android:text="Camera" 
    tools:layout_editor_absoluteY="448dp" 
    tools:layout_editor_absoluteX="145dp" 
    android:layout_marginLeft="31dp" 
    android:layout_marginStart="31dp" 
    android:layout_below="@+id/imageView" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="60dp" /> 

<Button 
    android:id="@+id/btnComp" 
    android:layout_width="76dp" 
    android:layout_height="41dp" 
    android:text="compress" 
    tools:layout_editor_absoluteX="-9dp" 
    tools:layout_editor_absoluteY="-5dp" 
    android:layout_alignBottom="@+id/btnCam" 
    android:layout_alignRight="@+id/imageView" 
    android:layout_alignEnd="@+id/imageView" /> 

Answer 1

您还没有写好的代码保存它。尝试下面的代码从imageview中获取图像，将其压缩并保存到存储目录中。希望它能为你工作。

Bitmap bitmapsave = null; 
     //get image bitmap from imageview 
     bitmapsave = ((BitmapDrawable) imageView.getDrawable()).getBitmap(); 


     //create folder where you want to store compressed image 
     File file = new File(Environment.getExternalStorageDirectory().getPath(), "/yourAppname"); 
     if (!file.exists()) 
     { 
      file.mkdirs(); 
     } 
      // name that image 
      String filename = file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg"; 

    FileOutputStream out = null; 
    try 
    { 
     out = new FileOutputStream(filename); 
     bitmapsave.compress(Bitmap.CompressFormat.JPEG, 50, out); 
     out.close(); 

     Toast.makeText(getApplicationContext(), "saved successfully", Toast.LENGTH_SHORT).show(); 
    } 
    catch (FileNotFoundException e) 
    { 
     e.printStackTrace(); 
    } 
    catch (IOException e) 
    { 
     e.printStackTrace(); 
    } 

Answer 2

尝试此..

private void storeImage(Bitmap image) { 
    if(image == null){ 
     return; 
    } 
    try { 
     File pictureFile = new File ("your_path"); 

     FileOutputStream fos = new FileOutputStream(pictureFile); 
     image.compress(Bitmap.CompressFormat.PNG,100, fos); 
     fos.close(); 
     Log.e(TAG,"FILE created"); 
    } catch (FileNotFoundException e) { 
     Log.d(TAG, "File not found: " + e.getMessage()); 
    } catch (IOException e) { 
     Log.d(TAG, "Error accessing file: " + e.getMessage()); 
    } catch (Exception e){ 
     Log.e(TAG,"Excetion in image storage "+e.toString()); 
    } 
}