LocalBroadcastManagerと異なる方法を呼び出す方法

その他 2022-04-22 11:44:47 訪問数: 0
アンドロス島Adrianopolos：

私は3つのメニューボタンを持っている（add_image、save_memeとshare_memeに宣言されている私のアクションバー、上）Mainactivity.java。ボタンは、別のフラグメントの対応するメソッドを呼び出すための責任があります。接続が確立されているとLocalBroadcastManager。

public class MainActivity extends AppCompatActivity{
    Intent saveIntent, shareIntent, addImageIntent;
    LocalBroadcastManager localBroadcastManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        localBroadcastManager = LocalBroadcastManager.getInstance(getApplicationContext());

        addImageIntent = new Intent("ADD_ACTION");
        saveIntent = new Intent("SAVE_ACTION");
        shareIntent = new Intent("SHARE_ACTION");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case R.id.add_image:
                localBroadcastManager.sendBroadcast(addImageIntent);
            case R.id.save_meme:
                localBroadcastManager.sendBroadcast(saveIntent);
            case R.id.share_meme:
                localBroadcastManager.sendBroadcast(shareIntent);
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

上述したように、対応する方法がであるTopImageFragment.javaクラス。add_imageボタンは、ユーザが画像をアップロードすることを可能にするメソッドを呼び出しImageView、デバイスからの：

public void selectedImage() {
    Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
    startActivityForResult(intent, PICK_IMAGE);
}

save_memeボタンは、デバイスへのビットマップを保存しメソッドを呼び出します。

public void saveMeme(Bitmap btm) {
        counter++;

        File file;
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);

        String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath();
        file = new File(path + "/Memery/" + timeStamp + counter + ".jpg");
        file.getParentFile().mkdir();

        try {
            OutputStream stream = new FileOutputStream(file);
            btm.compress(Bitmap.CompressFormat.JPEG, 100, stream);
            stream.flush();
            stream.close();
            Toast.makeText(getContext(), "Meme Saved", Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            e.printStackTrace();
        }

        Uri contentUri = Uri.fromFile(file);
        mediaScanIntent.setData(contentUri);
        Objects.requireNonNull(getContext()).sendBroadcast(mediaScanIntent);
    }

share_memeボタンは、ユーザーがソーシャルメディアアプリケーションや電子メールクライアントのさまざまなミームを共有することを可能にするメソッドを呼び出します。

public void shareMeme(Bitmap bitmap) {
    String path = MediaStore.Images.Media.insertImage(Objects.requireNonNull(getContext()).getContentResolver(), bitmap, "Meme", null);
    Uri uri = Uri.parse(path);

    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/*");
    share.putExtra(Intent.EXTRA_STREAM, uri);
    share.putExtra(Intent.EXTRA_TEXT, "This is my Meme");
    getContext().startActivity(Intent.createChooser(share, "Share Your Meme!"));
}

しかし、今何が起こっていることは、私は3つのメニューボタンのいずれかを選択するたびに、すべての3つの方法が呼び出されるということです。これは私の完全な断片です。

public class TopImageFragment extends Fragment {

    ImageView imageView;
    TextView topTextView, bottomTextView;
    RelativeLayout topImageRelativeLayout;
    public static final int PICK_IMAGE = 1;
    Uri imageUri;
    int counter = 0;
    String timeStamp = new SimpleDateFormat("yyyyMMdd", Locale.CANADA).format(new Date());
    float textSize, x, imageViewArea, canvasArea;
    double val;


    MemeViewModel memeViewModel;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_top_image, container, false);

        imageView = view.findViewById(R.id.meme_image_view);

        topTextView = view.findViewById(R.id.top_text_view);
        bottomTextView = view.findViewById(R.id.bottom_text_view);

        topImageRelativeLayout = view.findViewById(R.id.top_image_relative_layout);

        if (savedInstanceState != null) {
            imageUri = savedInstanceState.getParcelable("imageUri");
            imageView.setImageURI(imageUri);
        }
        return view;
    }

    @Override
    public void onSaveInstanceState(@NonNull Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putParcelable("imageUri", imageUri);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        memeViewModel = ViewModelProviders.of(Objects.requireNonNull(getActivity())).get(MemeViewModel.class);

        memeViewModel.getTopText().observe(getViewLifecycleOwner(), new Observer<CharSequence>() {
            @Override
            public void onChanged(@Nullable CharSequence charSequence) {
                topTextView.setText(charSequence);
            }
        });

        memeViewModel.getBottomText().observe(getViewLifecycleOwner(), new Observer<CharSequence>() {
            @Override
            public void onChanged(@Nullable CharSequence charSequence) {
                bottomTextView.setText(charSequence);
            }
        });
    }

    public void selectedImage() {
        Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
        startActivityForResult(intent, PICK_IMAGE);
    }

    public Bitmap getBitmap(ImageView img) {
        BitmapDrawable bitmapDrawable = ((BitmapDrawable) img.getDrawable());
        Bitmap bitmap = bitmapDrawable.getBitmap();

        return bitmap.copy(Bitmap.Config.ARGB_8888, true);
    }

    public Bitmap screenshotMeme() {
        Bitmap image = Bitmap.createBitmap(topImageRelativeLayout.getWidth(), topImageRelativeLayout.getHeight(), Bitmap.Config.RGB_565);
        topImageRelativeLayout.draw(new Canvas(image));

        return image.copy(Bitmap.Config.ARGB_8888, true);
    }

    public Bitmap drawMeme(Bitmap mutableBitmap) {

        String topText = topTextView.getText().toString();
        String bottomText = bottomTextView.getText().toString();

        topText = topText.toUpperCase();
        bottomText = bottomText.toUpperCase();

        Canvas canvas = new Canvas(mutableBitmap);

        TextPaint topFillPaint = new TextPaint();
        TextPaint bottomFillPaint = new TextPaint();

        TextPaint topStrokePaint = new TextPaint();
        TextPaint bottomStrokePaint = new TextPaint();

        Typeface typeface = getResources().getFont(R.font.impact);

        textSize = topTextView.getTextSize();
        imageViewArea = (imageView.getWidth()) * (imageView.getHeight());
        canvasArea = (canvas.getWidth()) * (canvas.getHeight());
        val = textSize * sqrt(canvasArea / imageViewArea);
        x = (float) val;

        topFillPaint.setColor(Color.WHITE);
        topFillPaint.setTextSize(x);
        topFillPaint.setTypeface(typeface);
        topFillPaint.setStyle(Paint.Style.FILL_AND_STROKE);

        topStrokePaint.setStyle(Paint.Style.STROKE);
        topStrokePaint.setStrokeWidth(4);
        topStrokePaint.setTextSize(x);
        topStrokePaint.setColor(Color.BLACK);
        topStrokePaint.setTypeface(typeface);

        bottomFillPaint.setColor(Color.WHITE);
        bottomFillPaint.setTextSize(x);
        bottomFillPaint.setTypeface(typeface);
        bottomFillPaint.setStyle(Paint.Style.FILL_AND_STROKE);

        bottomStrokePaint.setStyle(Paint.Style.STROKE);
        bottomStrokePaint.setStrokeWidth(4);
        bottomStrokePaint.setColor(Color.BLACK);
        bottomStrokePaint.setTextSize(x);
        bottomStrokePaint.setTypeface(typeface);

        StaticLayout topFillLayout = new StaticLayout(topText, topFillPaint, canvas.getWidth(), Layout.Alignment.ALIGN_CENTER,
                0.8f, 0.0f, false);
        StaticLayout topStrokeLayout = new StaticLayout(topText, topStrokePaint, canvas.getWidth(), Layout.Alignment.ALIGN_CENTER,
                0.8f, 0.0f, false);
        StaticLayout bottomFillLayout = new StaticLayout(bottomText, bottomFillPaint, canvas.getWidth(), Layout.Alignment.ALIGN_CENTER,
                0.8f, 0.0f, false);
        StaticLayout bottomStrokeLayout = new StaticLayout(bottomText, bottomStrokePaint, canvas.getWidth(), Layout.Alignment.ALIGN_CENTER,
                0.8f, 0.0f, false);

        topFillLayout.draw(canvas);

        topStrokeLayout.draw(canvas);

        canvas.translate(0, canvas.getHeight() - bottomFillLayout.getHeight());
        bottomFillLayout.draw(canvas);

        bottomStrokeLayout.draw(canvas);

        return mutableBitmap;
    }

    public void saveMeme(Bitmap btm) {
        counter++;

        File file;
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);

        String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath();
        file = new File(path + "/Memery/" + timeStamp + counter + ".jpg");
        file.getParentFile().mkdir();

        try {
            OutputStream stream = new FileOutputStream(file);
            btm.compress(Bitmap.CompressFormat.JPEG, 100, stream);
            stream.flush();
            stream.close();
            Toast.makeText(getContext(), "Meme Saved", Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            e.printStackTrace();
        }

        Uri contentUri = Uri.fromFile(file);
        mediaScanIntent.setData(contentUri);
        Objects.requireNonNull(getContext()).sendBroadcast(mediaScanIntent);
    }

    public void shareMeme(Bitmap bitmap) {
        String path = MediaStore.Images.Media.insertImage(Objects.requireNonNull(getContext()).getContentResolver(), bitmap, "Meme", null);
        Uri uri = Uri.parse(path);

        Intent share = new Intent(Intent.ACTION_SEND);
        share.setType("image/*");
        share.putExtra(Intent.EXTRA_STREAM, uri);
        share.putExtra(Intent.EXTRA_TEXT, "This is my Meme");
        getContext().startActivity(Intent.createChooser(share, "Share Your Meme!"));
    }

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

        if (resultCode == RESULT_OK && requestCode == PICK_IMAGE) {
            imageUri = Objects.requireNonNull(data).getData();
            imageView.setImageURI(imageUri);
            memeViewModel.setSharedId(imageUri.getLastPathSegment());
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        LocalBroadcastManager.getInstance(Objects.requireNonNull(getActivity())).registerReceiver(addListener, new IntentFilter("ADD_ACTION"));
        LocalBroadcastManager.getInstance(Objects.requireNonNull(getActivity())).registerReceiver(saveListener, new IntentFilter("SAVE_ACTION"));
        LocalBroadcastManager.getInstance(Objects.requireNonNull(getActivity())).registerReceiver(shareListener, new IntentFilter("SHARE_ACTION"));
    }

    private BroadcastReceiver addListener = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            selectedImage();
        }
    };

    private BroadcastReceiver saveListener = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            float height = getBitmap(imageView).getHeight();
            float width = getBitmap(imageView).getWidth();

            if ((height <= 600) || (width <= 600)) {
                saveMeme(screenshotMeme());
                Toast.makeText(getContext(), "screenshotMeme() method was called", Toast.LENGTH_SHORT).show();
            } else {
                saveMeme(drawMeme(getBitmap(imageView)));
                Toast.makeText(getContext(), "drawMeme() method was called", Toast.LENGTH_SHORT).show();
            }
        }
    };

    private BroadcastReceiver shareListener = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            float height = getBitmap(imageView).getHeight();
            float width = getBitmap(imageView).getWidth();

            if ((height <= 600) || (width <= 600)) {
                shareMeme(screenshotMeme());
                Toast.makeText(getContext(), "screenshotMeme() method was called", Toast.LENGTH_SHORT).show();
            } else {
                shareMeme(drawMeme(getBitmap(imageView)));
                Toast.makeText(getContext(), "drawMeme() method was called", Toast.LENGTH_SHORT).show();
            }
        }
    };

    @Override
    public void onPause() {
        super.onPause();
        LocalBroadcastManager.getInstance(Objects.requireNonNull(getActivity())).unregisterReceiver(addListener);
        LocalBroadcastManager.getInstance(Objects.requireNonNull(getActivity())).unregisterReceiver(saveListener);
        LocalBroadcastManager.getInstance(Objects.requireNonNull(getActivity())).unregisterReceiver(shareListener);
    }
}
チュオン息子：

問題：スイッチケースのブロックには、あなたが戻るか、またはbreak文を入れていないので、メニュー項目がクリックされるたびに、そして、それは、スイッチケース内のすべての文を実行します。

ソリューション：入れてreturn trueメニュー項目がクリックされたときにイベントを消費したい示すために、それぞれのケースに。

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()){
        case R.id.add_image:
            localBroadcastManager.sendBroadcast(addImageIntent);
            return true;
        case R.id.save_meme:
            localBroadcastManager.sendBroadcast(saveIntent);
            return true;
        case R.id.share_meme:
            localBroadcastManager.sendBroadcast(shareIntent);
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

または使用してbreak、その後、それぞれの場合に文をメソッドの最後にtrueを返します。

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()){
        case R.id.add_image:
            localBroadcastManager.sendBroadcast(addImageIntent);
            break;
        case R.id.save_meme:
            localBroadcastManager.sendBroadcast(saveIntent);
            break;
        case R.id.share_meme:
            localBroadcastManager.sendBroadcast(shareIntent);
            break;
        default:
            return super.onOptionsItemSelected(item);
    }

    return true;
}

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