BindServiceDemo

最新推荐文章于 2021-05-26 18:38:13 发布

小雷Ryan

最新推荐文章于 2021-05-26 18:38:13 发布

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分类专栏： Android常用demo

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本文介绍了一个简单的Android应用案例，该应用通过绑定服务的方式实现下载进度的实时更新。MainActivity通过绑定MsgService服务并监听下载进度，进而更新进度条。

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MainActivity.java

public class MainActivity extends Activity {

    private MsgService msgService;
    private int progress = 0;
    private ProgressBar mProgressBar;


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

        msgService = new MsgService();

        //绑定Service
        Intent intent = new Intent("com.example.MSG_ACTION");
        bindService(intent, conn, Context.BIND_AUTO_CREATE);


        mProgressBar = (ProgressBar) findViewById(R.id.progressBar1);
        Button mButton = (Button) findViewById(R.id.button1);
        mButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                //开始下载
                msgService.startDownLoad();
                //监听进度
                listenProgress();
            }
        });

    }


    /**
     * 监听进度，每秒钟获取调用MsgService的getProgress()方法来获取进度，更新UI
     */
    public void listenProgress(){
        new Thread(new Runnable() {

            @Override
            public void run() {
                while(progress < MsgService.MAX_PROGRESS){
                    progress = msgService.getProgress();
                    mProgressBar.setProgress(progress);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

            }
        }).start();
    }

    ServiceConnection conn = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {

        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //返回一个MsgService对象
            msgService = ((MsgService.MsgBinder)service).getService();

        }
    };

    @Override
    protected void onDestroy() {
        unbindService(conn);
        super.onDestroy();
    }

}

MsgService.java

public class MsgService extends Service {

    /**
     * 进度条的最大值
     */
    public static final int MAX_PROGRESS = 100;
    /**
     * 进度条的进度值
     */
    private int progress = 0;

    /**
     * 增加get()方法，供Activity调用
     * @return 下载进度
     */
    public int getProgress() {
        return progress;
    }

    /**
     * 模拟下载任务，每秒钟更新一次
     */
    public void startDownLoad(){
        new Thread(new Runnable() {

            @Override
            public void run() {
                while(progress < MAX_PROGRESS){
                    progress += 5;
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                }
            }
        }).start();
    }

    /**
     * 返回一个Binder对象
     */
    @Override
    public IBinder onBind(Intent intent) {
        return new MsgBinder();
    }

    public class MsgBinder extends Binder{
        /**
         * 获取当前Service的实例
         * @return
         */
        public MsgService getService(){
            return MsgService.this;
        }
    }

}

activity_main.xml

AndroidMainfest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.bindservicedemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.bindservicedemo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".MsgService"></service>
    </application>

</manifest>