Android(安卓)Service启动方式总结

1、StartService（）启动Service的方式：     onCreate--> onStartCommand ( 可多次调用 )-->onDestroy     在onCreate（）后，每次startService（）将会直接进入onStartCommand，onStart（）已经被废弃     在Activity中调用stopService（）或在service内部调用stopSelf（）结束Service
2、对于 bindService() 启动 Service 会经历：      context.bindService()->onCreate()->onBind()->Service running-->onUnbind() -> onDestroy() ->Service stop      Service是可以和多个Activity进行绑定的，但要注意的是，当Activity结束时一定要跟相应的Service解除绑定，不然是会报异常的（Main4Activity has leaked ServiceConnection），虽然此时即使报异常也不会影响Activity的结束了，然后还是会强制的解除绑定。      当多个Activity与Service进行绑定的时候，只有当所有的绑定都解除了之后，Service才会结束。
3、对于既用StartService（）和bindService()启动的Service：    这种调用方法可以起到即使与Service绑定的Activity结束了，Service依然不会死掉。这种方式启动的Service需要同时调用stopService（）和unbindService（）解除了所有绑定之后才能结束Service。
下面是两个Activity绑定一个Service的演示代码：第一个Activity：

package com.example.administrator.androidtrainingtest;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.support.design.widget.FloatingActionButton;import android.support.design.widget.Snackbar;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.util.Log;import android.view.View;import android.widget.Button;public class Main3Activity extends AppCompatActivity {    private boolean flag;    private static final String TAG = "TestActivity";    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);        Button btnStart = (Button) findViewById(R.id.btnStart);        Button btnStop = (Button) findViewById(R.id.btuStop);        Button butStartActivity = (Button) findViewById(R.id.btnStartActivity);        btnStart.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //启动service 方式2                bindService();            }        });        btnStop.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //停止service 方式2                unBindService();            }        });        butStartActivity.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startActivity(new Intent(Main3Activity.this, Main4Activity.class));            }        });    }    //启动service 方式2    //    private void bindService(){        Intent intent = new Intent(Main3Activity.this,BindService.class);        Log.i(TAG, "bindService()");        bindService(intent, conn, Context.BIND_AUTO_CREATE);    }    private void unBindService(){        Log.i(TAG, "unBindService() start....");        if(flag == true){            Log.i(TAG, "unBindService() flag");            unbindService(conn);            flag = false;        }    }    private ServiceConnection conn = new ServiceConnection() {        @Override        public void onServiceDisconnected(ComponentName name) {            // TODO Auto-generated method stub            Log.i(TAG, "onServiceDisconnected()");        }        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            // TODO Auto-generated method stub            Log.i(TAG, "onServiceConnected()");            BindService.MyBinder binder = (BindService.MyBinder)service;            BindService bindService = binder.getService1();            bindService.MyMethod();            flag = true;        }    };}

第二个Activity：

package com.example.administrator.androidtrainingtest;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.support.design.widget.FloatingActionButton;import android.support.design.widget.Snackbar;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.util.Log;import android.view.View;import android.widget.Button;public class Main4Activity extends AppCompatActivity {    private boolean flag;    private static final String TAG = "TestActivity";    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main4);        Button btnStart = (Button) findViewById(R.id.btnStart);        Button btnStop = (Button) findViewById(R.id.btuStop);        Button butStartActivity = (Button) findViewById(R.id.btnStartActivity);        btnStart.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //启动service 方式2                bindService();            }        });        btnStop.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //停止service 方式2                unBindService();            }        });    }    //启动service 方式2    //    private void bindService(){        Intent intent = new Intent(Main4Activity.this,BindService.class);        Log.i(TAG, "bindService()");        bindService(intent, conn, Context.BIND_AUTO_CREATE);    }    private void unBindService(){        Log.i(TAG, "unBindService() start....");        if(flag == true){            Log.i(TAG, "unBindService() flag");            unbindService(conn);            flag = false;        }    }    private ServiceConnection conn = new ServiceConnection() {        @Override        public void onServiceDisconnected(ComponentName name) {            // TODO Auto-generated method stub            Log.i(TAG, "onServiceDisconnected()");        }        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            // TODO Auto-generated method stub            Log.i(TAG, "onServiceConnected()");            BindService.MyBinder binder = (BindService.MyBinder)service;            BindService bindService = binder.getService1();            bindService.MyMethod();            flag = true;        }    };}

Service：

package com.example.administrator.androidtrainingtest;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;import android.util.Log;public class BindService extends Service {    private static final String TAG = "BindService";    private MyBinder myBinder = new MyBinder();    public void MyMethod(){        Log.i(TAG, "BindService-->MyMethod()");    }    @Override    public IBinder onBind(Intent intent) {        Log.i(TAG, "BindService-->onBind()");        return myBinder;    }    public class MyBinder extends Binder {        public BindService getService1(){            return BindService.this;        }    }    @Override    public void onCreate() {        Log.i(TAG, "BindService-->onCreate()");        super.onCreate();    }    @Override    public void onStart(Intent intent, int startId) {        Log.i(TAG, "BindService-->onStart()");        super.onStart(intent, startId);    }    @Override    public void onDestroy() {        Log.i(TAG, "BindService-->onDestroy()");        super.onDestroy();    }    @Override    public boolean onUnbind(Intent intent) {        Log.i(TAG, "BindService-->onUnbind()");        return super.onUnbind(intent);    }}

两次绑定及解除绑定的结果：

09-07 19:08:40.458 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: bindService()09-07 19:08:40.468 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onCreate()09-07 19:08:40.488 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onBind()09-07 19:08:40.498 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: onServiceConnected()09-07 19:08:40.498 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->MyMethod()09-07 19:08:43.961 9536-9536/com.example.administrator.androidtrainingtest I/Timeline: Timeline: Activity_launch_request time:2096552109-07 19:08:44.071 9536-9536/com.example.administrator.androidtrainingtest D/ActivityThreadInjector: clearCachedDrawables.09-07 19:08:44.262 9536-9581/com.example.administrator.androidtrainingtest D/OpenGLRenderer: endAllActiveAnimators on 0xb4f90580 (RippleDrawable) with handle 0xa520db6009-07 19:08:44.272 9536-9536/com.example.administrator.androidtrainingtest I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@3dcf5808 time:2096583209-07 19:08:45.943 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: bindService()09-07 19:08:45.963 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: onServiceConnected()09-07 19:08:45.963 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->MyMethod()09-07 19:08:48.426 9536-9547/com.example.administrator.androidtrainingtest I/art: Debugger is no longer active09-07 19:09:17.444 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() start....09-07 19:09:17.444 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() flag09-07 19:09:21.658 9536-9536/com.example.administrator.androidtrainingtest I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@178fe5a8 time:2100322809-07 19:09:24.120 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() start....09-07 19:09:24.120 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() flag09-07 19:09:24.131 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onUnbind()09-07 19:09:24.131 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onDestroy()09-07 19:09:27.043 9536-9547/com.example.administrator.androidtrainingtest I/art: Debugger is no longer active

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