ToastModule.java

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package com.facebook.react.modules.toast;

import android.view.Gravity;
import android.widget.Toast;

import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.common.MapBuilder;
import com.facebook.react.bridge.UiThreadUtil;
import com.facebook.react.module.annotations.ReactModule;

import java.util.Map;

/**
 * {@link NativeModule} that allows JS to show an Android Toast.
 */
@ReactModule(name = "ToastAndroid")
public class ToastModule extends ReactContextBaseJavaModule {

  private static final String DURATION_SHORT_KEY = "SHORT";
  private static final String DURATION_LONG_KEY = "LONG";

  private static final String GRAVITY_TOP_KEY = "TOP";
  private static final String GRAVITY_BOTTOM_KEY = "BOTTOM";
  private static final String GRAVITY_CENTER = "CENTER";

  public ToastModule(ReactApplicationContext reactContext) {
    super(reactContext);
  }

  @Override
  public String getName() {
    return "ToastAndroid";
  }

  @Override
  public Map<String, Object> getConstants() {
    final Map<String, Object> constants = MapBuilder.newHashMap();
    constants.put(DURATION_SHORT_KEY, Toast.LENGTH_SHORT);
    constants.put(DURATION_LONG_KEY, Toast.LENGTH_LONG);
    constants.put(GRAVITY_TOP_KEY, Gravity.TOP | Gravity.CENTER_HORIZONTAL);
    constants.put(GRAVITY_BOTTOM_KEY, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL);
    constants.put(GRAVITY_CENTER, Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL);
    return constants;
  }

  @ReactMethod
  public void show(final String message, final int duration) {
    UiThreadUtil.runOnUiThread(new Runnable() {
      @Override
      public void run() {
        Toast.makeText(getReactApplicationContext(), message, duration).show();
      }
    });
  }

  @ReactMethod
  public void showWithGravity(final String message, final int duration, final int gravity) {
    UiThreadUtil.runOnUiThread(new Runnable() {
      @Override
      public void run() {
        Toast toast = Toast.makeText(getReactApplicationContext(), message, duration);
        toast.setGravity(gravity, 0, 0);
        toast.show();
      }
    });
  }
}