绑定和解绑服务 2
第十章
MyService.java 代码如下:
主要的目的是在Activity中可以操作Service
...
public class MyService extends Service { private static final String TAG = "MyService"; public MyService() { } private DownloadBinder mBinder = new DownloadBinder(); class DownloadBinder extends Binder { public void startDownload() { Log.d("MyService", "startDownload executed"); } public int getProgress() { Log.d("MyService", "getProgress executed"); return 0; } } @Override public IBinder onBind(Intent intent) { return mBinder; } @Override public void onCreate() { super.onCreate(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.d(TAG, "onStartCommand: Service Start"); return super.onStartCommand(intent, flags, startId); } @Override public void onDestroy() { Log.d(TAG, "onDestroy: Service Stop"); super.onDestroy(); } }
MainActivity.java 代码如下:
... public class MainActivity extends AppCompatActivity implements View.OnClickListener { private MyService.DownloadBinder downloadBinder; private ServiceConnection connection = new ServiceConnection() { @Override public void onServiceDisconnected(ComponentName name) { } @Override public void onServiceConnected(ComponentName name, IBinder service) { downloadBinder = (MyService.DownloadBinder) service; downloadBinder.startDownload(); downloadBinder.getProgress(); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button startService = (Button) findViewById(R.id.start_service); Button stopService = (Button) findViewById(R.id.stop_service); startService.setOnClickListener(this); stopService.setOnClickListener(this); Button bindService = (Button) findViewById(R.id.bind_service); Button unbindService = (Button) findViewById(R.id.unbind_service); bindService.setOnClickListener(this); unbindService.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.start_service: Intent startIntent = new Intent(this, MyService.class); startService(startIntent); // 启动服务 break; case R.id.stop_service: Intent stopIntent = new Intent(this, MyService.class); stopService(stopIntent); // 停止服务 break; case R.id.bind_service: Intent bindIntent = new Intent(this, MyService.class); bindService(bindIntent, connection, BIND_AUTO_CREATE); // 绑定服务 break; case R.id.unbind_service: unbindService(connection); // 解绑服务 break; default: break; } } }
activity_main.xml 代码如下:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/start_service" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Start Service" /> <Button android:id="@+id/stop_service" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Stop Service" /> <Button android:id="@+id/bind_service" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Bind Service" /> <Button android:id="@+id/unbind_service" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Unbind Service" /> </LinearLayout>