1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.launcher3.util; 17 18 import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR; 19 20 import android.app.Activity; 21 import android.content.Context; 22 import android.os.Handler; 23 import android.os.IBinder; 24 import android.os.Message; 25 import android.view.inputmethod.InputMethodManager; 26 27 /** 28 * Utility class for offloading some class from UI thread 29 */ 30 public class UiThreadHelper { 31 32 private static final MainThreadInitializedObject<Handler> HANDLER = 33 new MainThreadInitializedObject<>( 34 c -> new Handler(UI_HELPER_EXECUTOR.getLooper(), new UiCallbacks(c))); 35 36 private static final int MSG_HIDE_KEYBOARD = 1; 37 private static final int MSG_SET_ORIENTATION = 2; 38 private static final int MSG_RUN_COMMAND = 3; 39 hideKeyboardAsync(Context context, IBinder token)40 public static void hideKeyboardAsync(Context context, IBinder token) { 41 Message.obtain(HANDLER.get(context), MSG_HIDE_KEYBOARD, token).sendToTarget(); 42 } 43 setOrientationAsync(Activity activity, int orientation)44 public static void setOrientationAsync(Activity activity, int orientation) { 45 Message.obtain(HANDLER.get(activity), MSG_SET_ORIENTATION, orientation, 0, activity) 46 .sendToTarget(); 47 } 48 setBackButtonAlphaAsync(Context context, AsyncCommand command, float alpha, boolean animate)49 public static void setBackButtonAlphaAsync(Context context, AsyncCommand command, float alpha, 50 boolean animate) { 51 runAsyncCommand(context, command, Float.floatToIntBits(alpha), animate ? 1 : 0); 52 } 53 runAsyncCommand(Context context, AsyncCommand command, int arg1, int arg2)54 public static void runAsyncCommand(Context context, AsyncCommand command, int arg1, int arg2) { 55 Message.obtain(HANDLER.get(context), MSG_RUN_COMMAND, arg1, arg2, command).sendToTarget(); 56 } 57 58 private static class UiCallbacks implements Handler.Callback { 59 60 private final Context mContext; 61 private final InputMethodManager mIMM; 62 UiCallbacks(Context context)63 UiCallbacks(Context context) { 64 mContext = context; 65 mIMM = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE); 66 } 67 68 @Override handleMessage(Message message)69 public boolean handleMessage(Message message) { 70 switch (message.what) { 71 case MSG_HIDE_KEYBOARD: 72 mIMM.hideSoftInputFromWindow((IBinder) message.obj, 0); 73 return true; 74 case MSG_SET_ORIENTATION: 75 ((Activity) message.obj).setRequestedOrientation(message.arg1); 76 return true; 77 case MSG_RUN_COMMAND: 78 ((AsyncCommand) message.obj).execute(mContext, message.arg1, message.arg2); 79 return true; 80 } 81 return false; 82 } 83 } 84 85 public interface AsyncCommand { execute(Context proxy, int arg1, int arg2)86 void execute(Context proxy, int arg1, int arg2); 87 } 88 } 89