Android service生命周期详解

首先创建TestService.java服务：

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

import java.util.Random;

public class TestService extends Service {

    public class MyBinder extends Binder {
        public TestService getService() {
            return TestService.this;
        }
    }

    private MyBinder binder = new MyBinder();

    public int getRandomNumber() {
        return new Random().nextInt();
    }

    @Override
    public void onCreate() {
        Log.e("buder", "TestService 执行 onCreate");
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e("buder", "TestService 执行 onStartCommand");
        return START_NOT_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.e("buder", "TestService 执行 onBind");
        return binder;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.e("buder", "TestService 执行 onUnbind");
        sleepingOne();
        return false;
    }

    @Override
    public void onDestroy() {
        Log.e("buder", "TestService 执行 onDestroy");
        super.onDestroy();
    }

    private void sleepingOne(){
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

AndroidManifest.xml的service配置：

MainActivity.java 开启或者绑定service服务的调用（显示启动和隐式启动）：

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private TestService service = null;

    private boolean isBind = false;

    ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder binder) {
            isBind = true;
            TestService.MyBinder myBinder = (TestService.MyBinder) binder;
            service = myBinder.getService();
            Log.i("buder", "ActivityA 执行 onServiceConnected");
            int num = service.getRandomNumber();
            sleepingOne();
            Log.i("buder", "ActivityA 执行 getRandomNumber = " + num);
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            isBind = false;
            Log.i("buder", "ActivityA 执行 onServiceDisconnected");
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i("buder", "ActivityA 执行 onCreate");

        findViewById(R.id.btnBindService).setOnClickListener(this);
        findViewById(R.id.btnUnbindService).setOnClickListener(this);
        findViewById(R.id.btnStartActivityB).setOnClickListener(this);
        findViewById(R.id.btnFinish).setOnClickListener(this);

    }


    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btnBindService) {
            //单击了“bindService”按钮
            /**
             * 显示启动service
             */
//            Intent intent = new Intent(this, TestService.class);
//            intent.putExtra("from", "ActivityA");
            Log.i("buder", "ActivityA 执行 bindService");

            /**
             * 隐式启动service
             */
            Intent intent = new Intent();
            intent.putExtra("from", "ActivityA");
            ComponentName componentName = new ComponentName(getPackageName(), "com.example.testservices.TestService");
            intent.setComponent(componentName);
//            startService(intent);
            bindService(intent, connection, BIND_AUTO_CREATE);
        } else if (v.getId() == R.id.btnUnbindService) {
            //单击了“unbindService”按钮
            if (isBind) {
                Log.i("buder", "ActivityA 执行 unbindService");
                unbindService(connection);
            }
        } else if (v.getId() == R.id.btnStartActivityB) {
            //单击了“start ActivityB”按钮
            Intent intent = new Intent(this, ActivityB.class);
            Log.i("buder", "ActivityA 启动 ActivityB");
            startActivity(intent);
        } else if (v.getId() == R.id.btnFinish) {
            //单击了“Finish”按钮
            Log.i("buder", "ActivityA 执行 finish");
            this.finish();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i("buder", "ActivityA 执行 onDestroy");
    }

    private void sleepingOne(){
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

测试使用的另外一个ActivityB.java：

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.View;

public class ActivityB extends Activity implements View.OnClickListener {

    private TestService service = null;

    private boolean isBind = false;

    private ServiceConnection conn = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder binder) {
            isBind = true;
            TestService.MyBinder myBinder = (TestService.MyBinder) binder;
            service = myBinder.getService();
            Log.i("buder", "ActivityB 执行 onServiceConnected");
            int num = service.getRandomNumber();
            Log.i("buder", "ActivityB 执行 getRandomNumber = " + num);
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            isBind = false;
            Log.i("buder", "ActivityB 执行 onServiceDisconnected");
        }
    };

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_b);

        findViewById(R.id.btnBindService).setOnClickListener(this);
        findViewById(R.id.btnUnbindService).setOnClickListener(this);
        findViewById(R.id.btnFinish).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btnBindService) {
            //单击了“bindService”按钮
            Intent intent = new Intent(this, TestService.class);
            intent.putExtra("from", "ActivityB");
            Log.i("buder", "ActivityB 执行 bindService");
            bindService(intent, conn, BIND_AUTO_CREATE);
        } else if (v.getId() == R.id.btnUnbindService) {
            //单击了“unbindService”按钮
            if (isBind) {
                Log.i("buder", "ActivityB 执行 unbindService");
                unbindService(conn);
            }
        } else if (v.getId() == R.id.btnFinish) {
            //单击了“Finish”按钮
            Log.i("buder", "ActivityB 执行 finish");
            this.finish();
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("buder", "ActivityB 执行 onDestroy");
    }

}

下面开始service生命周期的测试：

测试A：

1.MainActivity点击bind

2.MainActivity点击UNbind

测试B:

1.MainActivity的bind

2.MainActivity的finish

测试C：

1.MainActivity的bind

2.MainActivity的startActivityB

3.ActivityB的bind

4.ActivityB的unbind

5.ActivityB的finish

6.MainActivity的unbind

完整的项目地址：https://github.com/buder-cp/base_component_learn/tree/master/testservices

本博客参考：https://blog.csdn.net/iispring/article/details/48169339#quote