Android選擇圖片或照相機

Question

我已經實現了從SD或相機選擇圖像的代碼。 但是，我的圖像不出現在ImageView，我無法從SD卡中選擇圖像。

當我點擊SD卡上的圖片時，它會立即跳回到我的活動。

final String[] items = new String[] {"From Camera","From SD Card"}; 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.select_dialog_item,items); 
    AlertDialog.Builder builder = new AlertDialog.Builder(this); 
    builder.setTitle("Select Image"); 
    builder.setAdapter(adapter,new DialogInterface.OnClickListener(){ 
     public void onClick(DialogInterface dialog,int which){ 
      if(which == 0){ 
       intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       File file = new File(Environment.getExternalStorageDirectory(),"event_image"+String.valueOf(System.currentTimeMillis()+".jpg")); 
       imageCaptureUri = Uri.fromFile(file); 
       try { 
        intent.putExtra(MediaStore.EXTRA_OUTPUT,imageCaptureUri); 
        intent.putExtra("return data",true); 
        startActivityForResult(intent,PICK_FROM_CAMERA); 
       }catch(Exception ex){ 
        ex.printStackTrace(); 
       } 
       dialog.cancel(); 
      }else{ 
       intent = new Intent(); 
       intent.setType("image/*"); 
       intent.setAction(Intent.ACTION_GET_CONTENT); 
       startActivityForResult(Intent.createChooser(intent,"Complete action using"),PICK_FROM_FILE); 
      } 
     } 
    }); 
    final AlertDialog dialog = builder.create(); 
    mImageView = (ImageView) findViewById(R.id.imageView); 
    imagePicker = (ImageButton) findViewById(R.id.image_picker); 
    imagePicker.setOnClickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View v){ 
      dialog.show(); 
     } 
    }); 

    @Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    if(requestCode != RESULT_OK) 
     return; 
    Bitmap bitmap = null; 
    String path =""; 
    if(requestCode == PICK_FROM_FILE) { 
     imageCaptureUri = data.getData(); 
     path = getRealPathFromURI(imageCaptureUri); 
     if(path == null) 
      path = imageCaptureUri.getPath(); 
     if(path != null){ 
      bitmap = BitmapFactory.decodeFile(path); 
     } 
    }else{ 
     path = imageCaptureUri.getPath(); 
     bitmap = BitmapFactory.decodeFile(path); 
    } 
    mImageView.setImageBitmap(bitmap); 
} 


    public String getRealPathFromURI(Uri contentURI){ 
    String[] proj = {MediaStore.Images.Media.DATA}; 
    Cursor cursor = managedQuery(contentURI,proj,null,null,null); 
    if(cursor == null) return null; 
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
    cursor.moveToFirst(); 
    return cursor.getString(column_index); 
} 

Answer 1

1. 首先，你需要使用許可WRITE_EXTERNAL_STORAGE在AndroidManifest.xml

2. 在你的XML佈局：

   <ImageView 
       android:id="@+id/img" 
       android:layout_width="match_parent" 
       android:layout_height="380dp" 
       android:background="#f241c9" /> 
   
   <Button 
       android:id="@+id/btnCapture" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_gravity="center" 
       android:layout_marginTop="20dp" 
       android:text="Take Photo" /> 
   
   <Button 
       android:id="@+id/btnPick" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_gravity="center" 
       android:layout_marginTop="20dp" 
       android:text="Pick Photo" /> 
   

3. 在您的活動類：

   private static final String TAG = "my_log"; 
   private static final int REQUEST_CAPTURE_FROM_CAMERA = 1; 
   private static final int REQUEST_PICK_FROM_FILE = 2; 
   private static final int REQUEST_CROP_INTENT = 3; 
   
   ImageView img; 
   Button btnCapture, btnPick; 
   File file; 
   
   @Override 
   protected void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.activity_main); 
   
       img = (ImageView) findViewById(R.id.img); 
       btnCapture = (Button) findViewById(R.id.btnCapture); 
       btnPick = (Button) findViewById(R.id.btnPick); 
   
       btnCapture.setOnClickListener(new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); 
         file = new File(Environment.getExternalStorageDirectory() + File.separator + "img_captured.jpg"); 
         // put Uri as extra in intent object 
         intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file)); 
         startActivityForResult(intent, REQUEST_CAPTURE_FROM_CAMERA); 
        } 
       }); 
   
       btnPick.setOnClickListener(new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         Intent intent = new Intent(); 
         intent.setType("image/*"); 
         intent.setAction(Intent.ACTION_GET_CONTENT); 
         startActivityForResult(Intent.createChooser(intent, "Complete action using"), REQUEST_PICK_FROM_FILE); 
        } 
       }); 
   
   } 
   
   @Override 
   protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
   
       if (resultCode != RESULT_OK) return; 
   
       if (requestCode == REQUEST_CAPTURE_FROM_CAMERA) { 
        try { 
         cropImage(Uri.fromFile(file)); 
        } catch (ActivityNotFoundException e) { 
         Toast.makeText(this, "Your device does not support the crop action!", Toast.LENGTH_SHORT).show(); 
         e.printStackTrace(); 
        } 
       } else if (requestCode == REQUEST_PICK_FROM_FILE) { 
        try { 
         cropImage(data.getData()); 
        } catch (ActivityNotFoundException e) { 
         Toast.makeText(this, "Your device does not support the crop action!", Toast.LENGTH_SHORT).show(); 
         e.printStackTrace(); 
        } 
       } else if (requestCode == REQUEST_CROP_INTENT) { 
        // Create an instance of bundle and get the returned data 
        Bundle extras = data.getExtras(); 
        // get the cropped bitmap from extras 
        Bitmap bitmap = extras.getParcelable("data"); 
        img.setImageBitmap(bitmap); 
        if (saveBitmapToStorage(bitmap)) { 
         Log.d(TAG, "Bitmap saved to file successful."); 
        } else { 
         Log.d(TAG, "Failed to save Bitmap to storage."); 
        } 
       } 
   
   } 
   
   public void cropImage(Uri picUri) { 
       //call the standard crop action intent 
       Intent cropIntent = new Intent("com.android.camera.action.CROP"); 
       //indicate image type and Uri of image 
       cropIntent.setDataAndType(picUri, "image/*"); 
       //set crop properties 
       cropIntent.putExtra("crop", "true"); 
       //indicate aspect of desired crop 
       cropIntent.putExtra("aspectX", 1); 
       cropIntent.putExtra("aspectY", 1); 
       //indicate output X and Y 
       cropIntent.putExtra("outputX", 256); 
       cropIntent.putExtra("outputY", 256); 
       //retrieve data on return 
       cropIntent.putExtra("return-data", true); 
       //start the activity - we handle returning in onActivityResult 
       startActivityForResult(cropIntent, REQUEST_CROP_INTENT); 
   } 
   
   private boolean saveBitmapToStorage(Bitmap finalBitmap) { 
       boolean result = false; 
   
       File file = new File(Environment.getExternalStorageDirectory() + File.separator + "img_cropped.jpg"); 
       Log.d(TAG, "file path = " + file.getAbsolutePath()); 
   
       try { 
        FileOutputStream out = new FileOutputStream(file); 
        finalBitmap.compress(Bitmap.CompressFormat.JPEG, 100, out); 
        out.flush(); 
        out.close(); 
   
        // send Broadcast to notify this photo and see it in Gallery 
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 
        Uri contentUri = Uri.fromFile(file); 
        mediaScanIntent.setData(contentUri); 
        sendBroadcast(mediaScanIntent); 
   
        result = true; 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
   
       return result; 
   }