Android -- 启动Service并传递数据

本文主要记录Activity传递数据到Service。

1、效果图


2、通过以上效果图，可以看出activity页面的数值改变，相应后台service输出的数值也跟着改变。
3、核心代码如下，看代码中的38行，使用Intent作为载体，装载activity页面上的数据。

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<code class = "hljs" java= "" > package com.example.connectservice;   import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.EditText;   public class MainActivity extends Activity implements OnClickListener {        private EditText edit;        @Override      protected void onCreate(Bundle savedInstanceState) {          super .onCreate(savedInstanceState);          setContentView(R.layout.activity_main);            findViewById(R.id.startService).setOnClickListener( this );          findViewById(R.id.stopService).setOnClickListener( this );            edit = (EditText) findViewById(R.id.editText1);      }        @Override      public boolean onCreateOptionsMenu(Menu menu) {          // Inflate the menu; this adds items to the action bar if it is present.          getMenuInflater().inflate(R.menu.main, menu);          return true ;      }        @Override      public void onClick(View v) {          switch (v.getId()) {          case R.id.startService:              Intent i = new Intent( this , MyService. class );              i.putExtra(data, edit.getText().toString());              startService(i);              break ;          case R.id.stopService:              stopService( new Intent( this , MyService. class ));              break ;          }      }   } </code>

4、Service代码如下，详见代码的21行，我们在onStartCommand方法中通过intent参数获取activity传过来的值。

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<code class = "hljs" java= "" > package com.example.connectservice;   import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.widget.EditText;   public class MyService extends Service {        String data;      boolean running = false ;        @Override      public IBinder onBind(Intent intent) {          // TODO Auto-generated method stub          return null ;      }        @Override      public int onStartCommand(Intent intent, int flags, int startId) {          data = intent.getStringExtra(data);          return super .onStartCommand(intent, flags, startId);      }        @Override      public void onCreate() {          super .onCreate();          running = true ;            new Thread() {              public void run() {                  while (running) {                      System.out.println(Service中获取到的数据： + data);                      try {                          Thread.sleep( 1000 );                      } catch (InterruptedException e) {                          // TODO Auto-generated catch block                          e.printStackTrace();                      }                  }              };          }.start();      }        @Override      public void onDestroy() {          super .onDestroy();          running = false ;      }   } </code>

 

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<code class = "hljs" xml= "" ><manifest android:versioncode= "1" android:versionname= "1.0" package = "com.example.connectservice" xmlns:android= "http://schemas.android.com/apk/res/android" ><uses-sdk android:minsdkversion= "8" android:targetsdkversion= "21" >                              <intent-filter>                                      <category android:name= "android.intent.category.LAUNCHER" >              </category></action></intent-filter>          </activity>            <service android:enabled= "true" android:exported= "true" android:name= ".MyService" >          </service>      </application>   </uses-sdk></manifest> </code>