android studio IntentService

1.代码：

1. xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".IntentServiceActivity">

    <Button
        android:id="@+id/start_intent_service"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="启动intentService1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/bt_intent_service_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="启动intentService2"
        app:layout_constraintBottom_toTopOf="@+id/bt_stop_intent_service"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/start_intent_service" />
</androidx.constraintlayout.widget.ConstraintLayout>

2. java启动代码

@Override
    public void onClick(View v) {
    
    
        Intent intent=new Intent(IntentServiceActivity.this,MyIntentService.class);
        switch (v.getId()) {
    
    
            case R.id.start_intent_service:

                intent.putExtra(UtilsConstants.intent_values,1);

                break;
            case R.id.bt_intent_service_2:
                intent=new Intent(IntentServiceActivity.this,MyIntentService.class);
                intent.putExtra(UtilsConstants.intent_values,2);
                break;
        }
        startService(intent);
    }

MyIntentService代码
android studio自带创建方式
1.

2.

public class MyIntentService extends IntentService {
    
    
    private static final String TAG = "MyIntentService";
    public MyIntentService() {
    
    
        super("MyIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
    
    
        if (intent != null) {
    
    
            int values = intent.getIntExtra(UtilsConstants.intent_values,0);
            if (values==1){
    
    
                for (int i = 0; i < 100; i++) {
    
    
                    try {
    
    
                        Log.d(TAG, "onHandleIntent: "+values);
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
    
    
                        e.printStackTrace();
                    }
                }

            }else if (values==2){
    
    
                for (int i = 100; i < 200; i++) {
    
    
                    Log.d(TAG, "onHandleIntent: "+values);
                }

            }
        }
    }

    @Override
    public void onDestroy() {
    
    
        super.onDestroy();
        Log.d(TAG, "onDestroy: ");
    }
}

声明：

<service
            android:name="com.lapian.intentservice.MyIntentService"
            android:exported="false"></service>

工具类：

/**
 * @ClassName UtilsConstants
 * @Description TODO
 * @Author ${孙伟豪}
 * @Date 2020/10/10 9:28
 * @Version 1.0
 */
public class UtilsConstants {
    
    
    public static String intent_values="values";
} 

运行结果：

2.结论：

1. 点击多次启动，它们会顺序执行
2. 全部执行完，最后都会执行onDestroy
3. 可以用于执行耗时操作
4. 图解