0
我想通知UI線程有關從屬線程發生更改事件,以便UI線程可以更新視圖。對於一個執行確實幹得不錯,如:如何讓奴隸通知主人?
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();
}
}
}
但是當我試圖讓UI線程無限循環,等待從機的通知,該方案沒有奏效:
//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();
}
}
}
我試着首先要改變從奴隸線程的視圖,並發現這是禁止在Android中,所以我試圖然後使用處理程序線程,但事情並沒有順利,因爲我的預期。