Question

我正在为我的毕业设计建造一个GIF Creator。它是什么，当我尝试从画廊中选择一张照片时，它只是将它带到视图中，我想同时选择多张照片而不是去选择照片以获得另一张照片。除了我创建了一个按钮，所以如果用户改变主意，他们可以删除并从头开始而不必重新启动应用程序但是我不知道代码是什么。主要活动：

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

您可以将自定义库用于多个图像选择 1）MultiSelectRecyclerGalleryGridView 2）MultipleImagePick

Answer 2

像Kyle Shank回答的那样 https://stackoverflow.com/a/19848052/5090511

intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);

或者您可以使用类似的东西： https://github.com/luminousman/MultipleImagePick

如何从图库中选择多张照片？

2 个答案: