基于鸿蒙DevEco Studio，开发一个播放音乐的APP，要完整源代码

开发一个基于鸿蒙DevEco Studio的音乐播放APP需要以下几个步骤。以下是一个简单的示例代码，展示如何实现基本的音乐播放功能。 ### 1. 创建新项目 在DevEco Studio中创建一个新的鸿蒙项目，选择“Empty Ability”作为模板。 ### 2. 配置权限 在`config.json`文件中添加音频播放的权限： ```json { "app": { "bundleName": "com.example.musicplayer", "version": { "code": 1, "name": "1.0" }, "apiVersion": { "compatible": 3, "target": 3 } }, "deviceTypes": [ "phone" ], "abilities": [ { "name": "com.example.musicplayer.MainAbility", "label": "Music Player", "icon": "$media:icon", "type": "page", "permissions": [ "ohos.permission.INTERNET", "ohos.permission.READ_EXTERNAL_STORAGE" ], "uri": "pages/index" } ] } ``` ### 3. 设计界面 在`resources/base/layout`目录下创建`ability_main.xml`文件，设计简单的用户界面： ```xml <?xml version="1.0" encoding="utf-8"?> <DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:orientation="vertical" ohos:width="match_parent" ohos:height="match_parent" ohos:padding="16vp"> <Button ohos:id="$+id/play_button" ohos:text="Play" ohos:width="match_content" ohos:height="match_content"/> <Button ohos:id="$+id/stop_button" ohos:text="Stop" ohos:width="match_content" ohos:height="match_content"/> </DirectionalLayout> ``` ### 4. 实现音乐播放逻辑 在`MainAbilitySlice.java`中实现音乐播放逻辑： ```java package com.example.musicplayer; import ohos.aafwk.ability.AbilitySlice; import ohos.aafwk.content.Intent; import ohos.agp.components.Button; import ohos.media.player.Player; public class MainAbilitySlice extends AbilitySlice { private Player player; private Button playButton; private Button stopButton; @Override public void onStart(Intent intent) { super.onStart(intent); super.setUIContent(ResourceTable.Layout_ability_main); player = new Player(this); playButton = (Button) findComponentById(ResourceTable.Id_play_button); stopButton = (Button) findComponentById(ResourceTable.Id_stop_button); playButton.setClickedListener(component -> playMusic()); stopButton.setClickedListener(component -> stopMusic()); } private void playMusic() { try { player.setSource(ResourceTable.Media_your_music_file); player.prepare(); player.play(); } catch (Exception e) { e.printStackTrace(); } } private void stopMusic() { if (player != null) { player.stop(); } } @Override public void onStop() { super.onStop(); if (player != null) { player.release(); } } } ``` ### 5. 添加音乐文件 在`resources/base/media`目录下添加你的音乐文件，并在代码中引用该文件。 ### 6. 运行项目 连接鸿蒙设备或使用模拟器运行项目，点击“Play”按钮即可播放音乐，点击“Stop”按钮停止播放。