android Sevice详解

来源:互联网 发布:cs1.5fps优化器 编辑:程序博客网 时间:2024/05/17 00:57

写了这么久代码了,每次到写服务的时候总会忘记怎么写,那我就把你记到这里,这下忘记了就不会到处翻别人的博客了。

先上图,有图有真相,先上从别人那里盗来的生命周期图


启动服务用三种方式:

1,startService

2,bindService

3,startService和bindService连用

各个模式的区别

1,startService启动的生命周期

onCreate()——>onStart()(onStartCommand ()替代,onStart()过时)——>serviece is running——>onDestroy()

这种方法启动的服务是不受Activity的生命周期的影响,Activity消失过后服务依然运行


2,bindService启动的生命周期

onCreate()——>onBind()——> servieceis running——>onUnBind()——>onDestroy()

这种方法启动的服务是受Activity的生命周期的影响,Activity消失过后服务也就销毁。

同时这个种启动方式Activity里面可以操控Sevice,进行操作

3,startService和bindService连用启动

如果你既想操作service又想在Activity退出过后service依然在运行,该怎么办呢,上面两张方法都不合适

那就可以调用startService和bindService一起就能达到效果。

贴上测试的代码,自己去操作一下就会懂得,看打印就会了。

StartBindService

package come.xiaoke.growing.service;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;import android.support.annotation.Nullable;import android.util.Log;public class StartBindService extends Service {    private int numberStart = 0;    private int numberBind = 0;    private boolean run = true;    @Override    public void onCreate() {        super.onCreate();        numberStart = numberStart + 5;        numberBind = numberBind + 5;        Log.e("StartBindService", "onCreate");    }    public class BindBinder extends Binder {        StartBindService getService() {            return StartBindService.this;        }    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        new Thread(                new Runnable() {                    @Override                    public void run() {                        while (run) {                            Log.e("StartBindService", "start:" + numberBind++);                            try {                                Thread.sleep(1000);                            } catch (InterruptedException e) {                                e.printStackTrace();                            }                        }                    }                }        ).start();        Log.e("StartBindService", "onStartCommand");        return super.onStartCommand(intent, flags, startId);    }    private final IBinder mBinder = new BindBinder();    @Nullable    @Override    public IBinder onBind(Intent intent) {        new Thread(                new Runnable() {                    @Override                    public void run() {                        while (run) {                            Log.e("StartBindService", "bind:" + numberStart++);                            try {                                Thread.sleep(1000);                            } catch (InterruptedException e) {                                e.printStackTrace();                            }                        }                    }                }        ).start();        Log.e("StartBindService", "onBind");        return mBinder;    }    public void stop() {        run = false;    }    @Override    public boolean onUnbind(Intent intent) {        Log.e("StartBindService", "onUnbind");        return super.onUnbind(intent);    }    @Override    public void onDestroy() {        Log.e("StartBindService", "onDestroy");        super.onDestroy();    }}

ServiecActivity

package come.xiaoke.growing.service;import android.app.Activity;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.view.View;import come.xiaoke.growing.R;public class ServiecActivity extends Activity implements View.OnClickListener {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_serviec);        findViewById(R.id.btn_start).setOnClickListener(this);        findViewById(R.id.btn_bind).setOnClickListener(this);        findViewById(R.id.btn_stop).setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.btn_start:                Intent intent = new Intent(this, StartBindService.class);                startService(intent);                break;            case R.id.btn_bind:                Intent intent1 = new Intent(this, StartBindService.class);                bindService(intent1, mConnection, Context.BIND_AUTO_CREATE);                break;            case R.id.btn_stop:                if (mBoundService != null)                    mBoundService.stop();                break;        }    }    private StartBindService mBoundService;    //service和Activity交互的桥梁    private ServiceConnection mConnection = new ServiceConnection() {        public void onServiceConnected(ComponentName className, IBinder service) {            mBoundService = ((StartBindService.BindBinder) service).getService();        }        public void onServiceDisconnected(ComponentName className) {            mBoundService = null;        }    };    @Override    protected void onDestroy() {        super.onDestroy();        if (mBoundService != null)            unbindService(mConnection);    }}

xml

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="vertical">        <Button            android:id="@+id/btn_start"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="StartService" />        <Button            android:id="@+id/btn_bind"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="BindService" />        <Button            android:id="@+id/btn_stop"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="停止计算" />    </LinearLayout></ScrollView>
不容易啊,又复习了一次service,下面是最重要的来了,所以放最后面,就是service是工作在主线程也就是UI线程的,不能做耗时操作,如果你不相信可以去试一下,你的程序会没响应哦。



0 0
原创粉丝点击