3分钟
4.2.3 实施步骤
实施步骤
步骤1：新建项目，命名为IntentService。
步骤2:新建一个Service，如表4-2-9 intentServiceTest.java所示，实现了一个继承了IntentService 的类intentServiceTest，并在各个方法中插入LOG语句，显示调试信息。
表4-2-9 intentServiceTest.java文件清单
package com.example.intentservice;
import android.app.IntentService;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class intentServiceTest extends IntentService {
final String TAG="chen";
public intentServiceTest() {
super("intentServiceTest");
}
@Override
public IBinder onBind(Intent intent) {
Log.e(TAG, "onBind: ");
return super.onBind(intent);
}
@Override
public void onCreate() {
Log.e(TAG, "onCreate: ");
super.onCreate();
}
@Override
public void onStart(Intent intent, int startId) {
Log.e(TAG, "onStart: " );
super.onStart(intent, startId);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e(TAG, "onStartCommand: ");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void setIntentRedelivery(boolean enabled) {
super.setIntentRedelivery(enabled);
Log.e(TAG, "setIntentRedelivery: " );
}
@Override
protected void onHandleIntent(Intent intent) {
//Intent是从Activity发过来的，携带识别参数，根据参数不同执行不同的任务
String action = intent.getExtras().getString("param");
if (action.equals("oper1")) {
Log.e(TAG, "Operation1");
}else if (action.equals("oper2")) {
Log.e(TAG, "Operation2 " );
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void onDestroy() {
Log.e(TAG, "onDestroy: ");
super.onDestroy();
}
}步骤3：修改MainActivity.java，启动intentServiceTest类。如表表4-2-10所示。
表4-2-10 MainActivity.java文件清单
package com.example.intentservice;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onClick(View view) {
//Operation 1
Intent startServiceIntent = new Intent(this, intentServiceTest.class);;
Bundle bundle = new Bundle();
bundle.putString("param", "oper1");
startServiceIntent.putExtras(bundle);
startService(startServiceIntent);
//Operation 2
Intent startServiceIntent2 = new Intent(this, intentServiceTest.class);
Bundle bundle2 = new Bundle();
bundle2.putString("param", "oper2");
startServiceIntent2.putExtras(bundle2);
startService(startServiceIntent2);
}
}步骤4：修改布局文件activity_main.xml，实现一个按钮并设定了点击动作执行的方法。如表4-2-11所示。
表4-2-11 activity_main.xml文件清单
<?xml version="1.0" encoding="utf-8"?>
<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/intentService"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="启动服务"
/>
</LinearLayout>步骤5：在AndroidManifest.xml中注册IntentService，增加表4-2-12所示的语句。
表4-2-12 AndroidManifest.xml中增加的语句
<service android:name=".intentServiceTest"> </service>步骤6：在手机上运行并观察效果。
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