作為Android開發人員來說，Activity 向Service傳資料很容易，用Intent跳轉的時候攜帶資料，但是Service向Activity傳資料對於剛接觸可能相對有點難度，所以，此篇部落格記錄下Service向Activity用廣播傳值。

Android中Service向Activity傳值有好多種，分別是 用廣播、Service回撥、aidl…等等第三方，。今天先介紹用廣播傳值的，不多說，上程式碼！

1、MainActivity.java

public class MainActivity extends AppCompatActivity {

    private
 
 TextView textView=null;
    private MyReceiver receiver=null;

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

        textView=(TextView)findViewById(R.id.tv);
        //啟動服務
        startService(new
 
 Intent(MainActivity.this, MyService.class));
        //註冊廣播接收器
        receiver=new MyReceiver();
        IntentFilter filter=new IntentFilter();
        filter.addAction("com.project.moli.demobroad.MyService");
        MainActivity.this.registerReceiver(receiver,filter);

    }

    @Override
    protected
 
 void onDestroy() {
        //結束服務
        stopService(new Intent(MainActivity.this, MyService.class));
        super.onDestroy();
    }


    public class MyReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            Bundle bundle=intent.getExtras();
            int count=bundle.getInt("count");
            textView.setText(count+"");
        }
    }



}

2、MyService.java

public class MyService extends Service {
   public MyService() {
    }
    private int count = 0;
    private boolean tag=false;

    @Override
    public void onCreate() {
        super.onCreate();
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (!tag) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    count++;
                    Log.v("MyService", "Count is " + count);

                    //傳送廣播
                    Intent intent=new Intent();
                    intent.putExtra("count", count);
                    intent.setAction("com.project.moli.demobroad.MyService");
                    sendBroadcast(intent);
                }
            }
        }).start();

    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        count=0;
        tag = true;
        Log.v("MyService", "on destroy");
    }


}

3、AndroidManifests.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.project.moli.demobroad">

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

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

        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true"></service>
    </application>

</manifest>

4、附上圖片

今天先說一種，後面我會繼續更新其他的方法！我基本上都會附上全部程式碼！

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