Android中Service实时向Activity传递数据实例分析

2020-04-11 11:25:58

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本文实例讲述了Android中Service实时向Activity传递数据的方法。分享给大家供大家参考。具体如下：

这里演示一个案例，需求如下：

在Service组件中创建一个线程，该线程用来生产数值，每隔1秒数值自动加1，然后把更新后的数值在界面上实时显示。

步骤如下：

1、新建一个android项目工程，取名为demo。

2、新建一个Service类，用来实时生产数值，供界面实时显示。

package com.ljq.activity;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.util.Log;public class CountService extends Service { private int count = 0; private boolean threadDisable=false; @Override public void onCreate() { super.onCreate(); new Thread(new Runnable() {  @Override  public void run() {  while (!threadDisable) {   try {   Thread.sleep(1000);   } catch (InterruptedException e) {   e.printStackTrace();   }   count++;   Log.v("CountService", "Count is " + count);   //发送广播   Intent intent=new Intent();   intent.putExtra("count", count);   intent.setAction("com.ljq.activity.CountService");   sendBroadcast(intent);  }  } }).start(); } @Override public IBinder onBind(Intent intent) { return null; } @Override public void onDestroy() { super.onDestroy(); count=0; threadDisable = true; Log.v("CountService", "on destroy"); }}

3、新建一个Activity类，显示数据。

package com.ljq.activity;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity { private EditText editText=null; private MyReceiver receiver=null;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    editText=(EditText)findViewById(R.id.editText);    //启动服务    startService(new Intent(MainActivity.this, CountService.class)); //注册广播接收器 receiver=new MyReceiver(); IntentFilter filter=new IntentFilter(); filter.addAction("com.ljq.activity.CountService"); MainActivity.this.registerReceiver(receiver,filter);  }  @Override protected void onDestroy() {   //结束服务    stopService(new Intent(MainActivity.this, CountService.class)); super.onDestroy();  }  /**   * 获取广播数据   *    * @author jiqinlin   *   */  public class MyReceiver extends BroadcastReceiver {   @Override   public void onReceive(Context context, Intent intent) {   Bundle bundle=intent.getExtras();   int count=bundle.getInt("count");   editText.setText(count+"");     }  }}

4、main.xml布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">  <EditText android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:cursorVisible="false"    android:editable="false"    android:id="@+id/editText"/></LinearLayout>

5、清单文件

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="com.ljq.activity"   android:versionCode="1"   android:versionName="1.0">  <application android:icon="@drawable/icon" android:label="@string/app_name">    <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 =".CountService" />  </application>  <uses-sdk android:minSdkVersion="7" /></manifest>

效果如下：