android UI跨线程操作

android应用程序也是单线程程序，主线程为UI线程。

android 线程是非安全的，即不要在子线程中更新 UI。

publicclassMasterActivityextendsActivity{
TextViewtv=null;
Buttonbtn=null;
HandlermHandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
if(msg.what==1){
tv.setText("updateUIissuccess!");
btn.setText("updateUIissuccess!");
}
super.handleMessage(msg);
}
};
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
System.out.println(Thread.currentThread().getName()+":"+Thread.currentThread().getId());
tv=(TextView)findViewById(R.id.text);
btn=(Button)findViewById(R.id.btn);
btn.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
Threadthread=newThread(newRunnable(){
@Override
publicvoidrun(){
System.out.println(Thread.currentThread().getName()+":"+Thread.currentThread().getId());
Messagemsg=mHandler.obtainMessage();
msg.what=1;
msg.sendToTarget();
}});
thread.start();
}
});
}

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