標籤:android
繼上一篇文章:http://blog.csdn.net/gaopeng0071/article/details/45153495
本文主要記錄Activity傳遞資料到Service。
源碼與上一篇基本是保持一致的,只是在跳轉過程中增加了參數的傳遞。
我們先來看效果。
1、
2、通過以上,可以看出activity頁面的數值改變,相應後台service輸出的數值也跟著改變。
3、核心代碼如下,看代碼中的38行,我們使用之前學過的只是,使用Intent作為載體,裝載activity頁面上的資料。
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; } }}
4、Service代碼如下,詳見代碼的21行,我們在onStartCommand方法中通過intent參數擷取activity傳過來的值。
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中擷取到的資料:" + data); try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }; }.start(); } @Override public void onDestroy() { super.onDestroy(); running = false; }}
其他代碼
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical" tools:context=".MainActivity" > <EditText android:id="@+id/editText1" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" > <requestFocus /> </EditText> <Button android:id="@+id/startService" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="startService" /> <Button android:id="@+id/stopService" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="stopService" /></LinearLayout>
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.connectservice" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".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=".MyService" android:enabled="true" android:exported="true"> </service> </application></manifest>
Android -- 啟動Service並傳遞資料