Wie wählt man mehr als ein Foto aus der Galerie?

Question

Ich baue einen GIF Creator für mein Abschlussprojekt. Was es ist, wenn ich versuche, aus der Galerie ein Foto auszuwählen, das es nur zur Ansicht bringt, möchte ich mehr als ein Foto gleichzeitig auswählen, um nicht das Foto auszuwählen, um ein anderes Bild zu erhalten. Außerdem habe ich eine Schaltfläche erstellt. Wenn der Benutzer seine Meinung ändert, kann er löschen und von vorne anfangen, ohne die Anwendung neu starten zu müssen, aber ich weiß nicht, wofür der Code ist. Die Haupttätigkeit:

public class MainActivity extends AppCompatActivity { 

/** 
* this is the destination of the new GIF file, it will be saved directly in the SD card 
* (internal storage) in a file named "test.gif" 
*/ 
private static final String IMAGE_PATH = "/sdcard/test.gif"; 
private static final int REQUEST_CAMERA = 0, SELECT_FILE = 1; 
private boolean zoomOut = false; 
private Button btnSelect; 
private LinearLayout root; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.content_main); 
    btnSelect = (Button) findViewById(R.id.btnSelectPhoto); 
    root = (LinearLayout) findViewById(R.id.ll); 

    btnSelect.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      selectImage(); 
     } 
    }); 

    ImageView ivImage = (ImageView) findViewById(R.id.ivImage); 
    ivImage.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 


      if (root.getChildCount() == 0) { 
       return; 
      } 

      FileOutputStream outStream = null; 
      try { 
       outStream = new FileOutputStream(IMAGE_PATH); 
       outStream.write(generateGIF()); 
       outStream.close(); 
       Toast.makeText(MainActivity.this, 
         "GIF saved to " + IMAGE_PATH, Toast.LENGTH_LONG).show(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } finally { 
       if (outStream != null) { 
        try { 
         outStream.flush(); 
         outStream.close(); 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 


       } 
      } 
     } 
    }); 
} 

private void selectImage() { 
    final CharSequence[] items = {"Take Photo", "Choose from Library", 
      "Cancel"}; 

    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); 
    builder.setTitle("Add Photo!"); 
    builder.setItems(items, new DialogInterface.OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int item) { 
      if (items[item].equals("Take Photo")) { 
       Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       startActivityForResult(intent, REQUEST_CAMERA); 
      } else if (items[item].equals("Choose from Library")) { 
       Intent intent = new Intent(
         Intent.ACTION_PICK, 
         android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); 
       intent.setType("image/* video/*"); 
       startActivityForResult(
         Intent.createChooser(intent, "Select File"), 
         SELECT_FILE); 
      } else if (items[item].equals("Cancel")) { 
       dialog.dismiss(); 
      } 
     } 
    }); 
    builder.show(); 
} 

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

    if (resultCode == Activity.RESULT_OK) { 
     if (requestCode == SELECT_FILE) 
      onSelectFromGalleryResult(data); 
     else if (requestCode == REQUEST_CAMERA) 
      onCaptureImageResult(data); 
    } 
} 

private void onCaptureImageResult(Intent data) { 
    Bitmap thumbnail = (Bitmap) data.getExtras().get("data"); 
    ByteArrayOutputStream bytes = new ByteArrayOutputStream(); 
    thumbnail.compress(Bitmap.CompressFormat.JPEG, 100, bytes); 
    Bitmap resized = Bitmap.createScaledBitmap(thumbnail, 800, 150, true); 
    File destination = new File(Environment.getExternalStorageDirectory(), 
      System.currentTimeMillis() + ".jpg"); 

    FileOutputStream fo; 
    try { 
     destination.createNewFile(); 
     fo = new FileOutputStream(destination); 
     fo.write(bytes.toByteArray()); 
     fo.close(); 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    ImageView ivImage = new ImageView(this); 
    GradientDrawable gd = new GradientDrawable(); 
    gd.setColor(0xFF00FF00); // Changes this drawbale to use a single color instead of a gradient 
    gd.setCornerRadius(5); 
    gd.setStroke(1, 0xFF000000); 

    ivImage.setBackground(gd); 


// the following code causes a crash "NullPointerException" : 

//  Point point = null; // --> the reason for the crash 
//  getWindowManager().getDefaultDisplay().getSize(point); 
    //  int width = point.x; 
//  int height = point.y; 
// 
//  ivImage.setMinimumWidth(width); 
//  ivImage.setMinimumHeight(height); 
// 
//  ivImage.setMaxWidth(width); 
//  ivImage.setMaxHeight(height); 
//  ivImage.getLayoutParams().width = 20; // --> another crash happens here 
//  ivImage.getLayoutParams().height = 20; 


    ivImage.setLayoutParams(new ActionBar.LayoutParams(
      GridLayout.LayoutParams.WRAP_CONTENT, 
      GridLayout.LayoutParams.MATCH_PARENT)); 
    ivImage.setImageBitmap(thumbnail); 
    root.addView(ivImage); 

//  setContentView(root); 
//  ivImage.setImageBitmap(thumbnail); 
} 

@SuppressWarnings("deprecation") 
private void onSelectFromGalleryResult(Intent data) { 
    Uri selectedImageUri = data.getData(); 
    String[] projection = {MediaStore.MediaColumns.DATA}; 
    Cursor cursor = managedQuery(selectedImageUri, projection, null, null, 
      null); 
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA); 
    cursor.moveToFirst(); 

    String selectedImagePath = cursor.getString(column_index); 

    Bitmap bm; 
    BitmapFactory.Options options = new BitmapFactory.Options(); 
    options.inJustDecodeBounds = true; 
    BitmapFactory.decodeFile(selectedImagePath, options); 
    final int REQUIRED_SIZE = 200; 
    int scale = 1; 
    while (options.outWidth/scale/2 >= REQUIRED_SIZE 
      && options.outHeight/scale/2 >= REQUIRED_SIZE) 
     scale *= 2; 
    options.inSampleSize = scale; 
    options.inJustDecodeBounds = false; 
    bm = BitmapFactory.decodeFile(selectedImagePath, options); 
    final ImageView ivImage = new ImageView(this); 
    ivImage.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (zoomOut) { 
       Toast.makeText(getApplicationContext(), "NORMAL SIZE!", Toast.LENGTH_LONG).show(); 
       ivImage.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); 
       ivImage.setAdjustViewBounds(true); 
       zoomOut = false; 
      } else { 
       Toast.makeText(getApplicationContext(), "FULLSCREEN!", Toast.LENGTH_LONG).show(); 
       ivImage.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT)); 
       ivImage.setScaleType(ImageView.ScaleType.FIT_XY); 
       zoomOut = true; 
      } 
     } 
    }); 
    Display display = getWindowManager().getDefaultDisplay(); 
    int width = display.getWidth(); 
    int height = display.getHeight(); 

    ivImage.setMinimumWidth(width); 
    ivImage.setMinimumHeight(height); 

    ivImage.setMaxWidth(width); 
    ivImage.setMaxHeight(height); 
    ivImage.setLayoutParams(new ActionBar.LayoutParams(
      1000, 
      1000)); 
    ivImage.setImageBitmap(bm); 
    root.addView(ivImage); 
    setContentView(root); 
    ivImage.setImageBitmap(bm); 

} 

private byte[] generateGIF() { 

    ArrayList<Bitmap> bitmaps = new ArrayList<>(); 

    View v; 
    ImageView iv; 
    for (int i = 0; i < root.getChildCount(); i++) { 
     v = root.getChildAt(i); 
     if (v instanceof ImageView) { 
      iv = (ImageView) v; 
      bitmaps.add(((BitmapDrawable) iv.getDrawable()).getBitmap()); 
     } 
    } 

    ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
    AnimatedGifEncoder encoder = new AnimatedGifEncoder(); 
    encoder.start(bos); 
    for (Bitmap bitmap : bitmaps) { 
     encoder.addFrame(bitmap); 
    } 
    encoder.finish(); 
    return bos.toByteArray(); 
} 

} 

Answer 1

Sie benutzerdefinierte Bibliothek für mehrere Bilder können wählen, wie 1) MultiSelectRecyclerGalleryGridView 2) MultipleImagePick

Answer 2

wie Kyle Shank https://stackoverflow.com/a/19848052/5090511 beantwortet

intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true); 

Oder Sie können Verwenden Sie so etwas: https://github.com/luminousman/MultipleImagePick