Android Service两种启动方式
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1.Context.startService()方式启动
①Context.startService()方式的生命周期: 启动时,startService –> onCreate() –> onStart()停止时,stopService –> onDestroy()如果调用者直接退出而没有停止Service,则Service 会一直在后台运行 Context.startService()方法启动服务,在服务未被创建时,系统会先调用服务的onCreate()方法,接着调用onStart()方法。如果调用startService()方法前服务已经被创建,多次调用startService()方法并不会导致多次创建服务,但会导致多次调用onStart()方法。采用startService()方法启动的服务,只能调用Context.stopService()方法结束服务,服务结束时会调用onDestroy()方法附代码
2.Context.bindService()方式启动:①Context.bindService()方式的生命周期: 绑定时,bindService -> onCreate() –> onBind()调用者退出了,即解绑定时,Srevice就会unbindService –>onUnbind() –> onDestory()Context.bindService()方式启动 Service的方法:绑定Service需要三个参数:bindService(intent, conn, Service.BIND_AUTO_CREATE);第一个:Intent对象第二个:ServiceConnection对象,创建该对象要实现它的onServiceConnected()和 onServiceDisconnected()来判断连接成功或者是断开连接第三个:如何创建Service,一般指定绑定的时候自动创建附代码
- package com.dada.test;
- 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.util.Log;
- import android.view.View;
- import android.widget.Button;
- import com.dada.test.BindService.MyBinder;
- public class TestActivity extends Activity {
- 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.main);
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- Button btnStart = (Button) findViewById(R.id.btnStart);
- Button btnStop = (Button) findViewById(R.id.btnStop);
- 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(TestActivity.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()");
- MyBinder binder = (MyBinder)service;
- BindService bindService = binder.getService1();
- bindService.MyMethod();
- flag = true;
- }
- };
- }
package com.dada.test;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.util.Log;import android.view.View;import android.widget.Button;import com.dada.test.BindService.MyBinder;public class TestActivity extends Activity {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.main); super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btnStart = (Button) findViewById(R.id.btnStart); Button btnStop = (Button) findViewById(R.id.btnStop); 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(TestActivity.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()"); MyBinder binder = (MyBinder)service; BindService bindService = binder.getService1(); bindService.MyMethod(); flag = true; } };}
service
- package com.dada.test;
- 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);
- }
- }
package com.dada.test;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; } } @Overridepublic void onCreate() {Log.i(TAG, "BindService-->onCreate()");super.onCreate();}@Overridepublic void onStart(Intent intent, int startId) {Log.i(TAG, "BindService-->onStart()");super.onStart(intent, startId);}@Overridepublic void onDestroy() {Log.i(TAG, "BindService-->onDestroy()");super.onDestroy();}@Overridepublic boolean onUnbind(Intent intent) {Log.i(TAG, "BindService-->onUnbind()");return super.onUnbind(intent);}}
运行日志
点击启动
点击停止
没有打出onServiceDisconnected的日志的原因:
注:SDK上是这么说的:This is called when the connection with the service has beenunexpectedly disconnected -- that is, its process crashed. Because it is running in our same
process, we should never see this happen.
所以说,只有在service因异常而断开连接的时候,这个方法才会用到
其他
由于Service 的onStart()方法只有在startService()启动Service的情况下才调用,故使用onStart()的时候要注意这点。
与 Service 通信并且让它持续运行
如果我们想保持和 Service 的通信,又不想让 Service 随着 Activity 退出而退出呢?你可以先 startService() 然后再 bindService() 。当你不需要绑定的时候就执行 unbindService() 方法,执行这个方法只会触发 Service 的 onUnbind() 而不会把这个 Service 销毁。这样就可以既保持和 Service 的通信,也不会随着 Activity 销毁而销毁了。
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