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我想通知UI线程有关从属线程发生更改事件,以便UI线程可以更新视图。对于一个执行确实干得不错,如:如何让奴隶通知主人?
public Class MainActivity extends Activity{
private final Object mutex = new Object();
private String[] data;
private boolean flag = false;
//UI Thread
synchronized(mutex)
{
try {
mutex.wait();
if(!flag){
adapter = new PlayListAdapter(this, R.layout.activity_row_item, data);
listView = (ListView)findViewById(R.id.playlist_listView);
listView.setAdapter(adapter);
flag=true;
} else {
adapter.clear();
adapter.addAll(data);
adapter.notifyDataSetChanged();
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
//Slave thread
While(true){
//Waiting for an event to occur in order to update data
//change data
synchronized(mutex){
mutex.notify();
}
}
}
但是当我试图让UI线程无限循环,等待从机的通知,该方案没有奏效:
//UI Thread
while(true){
synchronized(mutex)
{
try {
mutex.wait();
if(!flag){
adapter = new PlayListAdapter(this, R.layout.activity_row_item, data);
listView = (ListView)findViewById(R.id.playlist_listView);
listView.setAdapter(adapter);
flag=true;
} else {
adapter.clear();
adapter.addAll(data);
adapter.notifyDataSetChanged();
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
我试着首先要改变从奴隶线程的视图,并发现这是禁止在Android中,所以我试图然后使用处理程序线程,但事情并没有顺利,因为我的预期。