Android开发 四大组件是否运行在主线程中?

Android的四大组件是不是运行在主线程中?打了log,做个笔记.

先上图:

图没有说服力,因为log是我写的.哈哈.

1.activity

在onCreate()里面打印当前的线程的id和name

@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);startService = (Button) findViewById(R.id.startService);startService.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubLog.e("test", "开启服务.....");startService(new Intent(MainActivity.this, MyService.class));}});sendBroadcast = (Button) findViewById(R.id.sendBroadcast);sendBroadcast.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Log.e("test", "发送广播.....");Intent intent = new Intent();intent.setAction("com.dingzhipeng");intent.putExtra("name", "dingzhipeng");MainActivity.this.sendBroadcast(intent);}});String threaName = Thread.currentThread().getName();long threaId = Thread.currentThread().getId();Log.e("test", "activity...");Log.e("test", "activity_threadId: " + threaId);Log.e("test", "activity_threadName: " + threaName);}

2.Service
同上,在onCreate()里面打印当前的线程的id和name

public class MyService extends Service {@Overridepublic IBinder onBind(Intent arg0) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {super.onCreate();String threaName = Thread.currentThread().getName();long threaId = Thread.currentThread().getId();Log.e("test", "service_threadId: " + threaId);Log.e("test", "service_threadName: " + threaName);}}

3.ContentProvider
manifest.xml中记得配置.log也是简单暴力

public class MyProvider extends ContentProvider {@Overridepublic int delete(Uri uri, String selection, String[] selectionArgs) {// TODO Auto-generated method stubreturn 0;}@Overridepublic String getType(Uri uri) {// TODO Auto-generated method stubreturn null;}@Overridepublic Uri insert(Uri uri, ContentValues values) {// TODO Auto-generated method stubreturn null;}@Overridepublic boolean onCreate() {String threaName = Thread.currentThread().getName();long threaId = Thread.currentThread().getId();Log.e("test", "内容提供者...");Log.e("test", "ContentProvider_threadId: " + threaId);Log.e("test", "ContentProvider_threadName: " + threaName);return false;}@Overridepublic Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder) {// TODO Auto-generated method stubreturn null;}@Overridepublic int update(Uri uri, ContentValues values, String selection,String[] selectionArgs) {// TODO Auto-generated method stubreturn 0;}}

4.BroadcastReceiver
在广播接收者中打log

public class MyReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context arg0, Intent arg1) {String name = arg1.getExtras().getString("name");Log.e("test", "接收到name: " + name);String threaName = Thread.currentThread().getName();long threaId = Thread.currentThread().getId();Log.e("test", "BroadcastReceiver_threadId: " + threaId);Log.e("test", "BroadcastReceiver_threadName: " + threaName);}}

总结:在activity,service,contentprovider的oncreate()中打印log,获取的当前线程都是主线程,在broadcastreceiver的onReceiver()中当前线程也是主线程,四大组件都是运行在主线程中.

demo源码下载


我的博客:http://blog.csdn.net/qq_31383345
欢迎批评!