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

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startService = (Button) findViewById(R.id.startService);
startService.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.e("test", "开启服务.....");
startService(new Intent(MainActivity.this, MyService.class));
}
});
sendBroadcast = (Button) findViewById(R.id.sendBroadcast);
sendBroadcast.setOnClickListener(new OnClickListener() {

@Override
public 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 {

@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}

@Override
public 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 {

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
// TODO Auto-generated method stub
return 0;
}

@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
return null;
}

@Override
public Uri insert(Uri uri, ContentValues values) {
// TODO Auto-generated method stub
return null;
}

@Override
public 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;
}

@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
// TODO Auto-generated method stub
return null;
}

@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
// TODO Auto-generated method stub
return 0;
}

}

4.BroadcastReceiver

在广播接收者中打log

public class MyReceiver extends BroadcastReceiver {
@Override
public 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!