可以将通过蓝牙接收到的数据存储到一个数据库,再将数据库调用,把数据显示在listview中或者textview中吗?
(怎样使用Timer类来将数据实时显示?)
先回答题主问题。可以使用listview组件中的textView显示蓝牙接受的收据。
题主提到Timer类。Timer类:可以定时执行自定义Task任务。
使用Timer可以定时刷新ListView的Adapter数据适配器(接收到的蓝牙数据)
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
public class TestTimer extends Activity {
//定义Timer
Timer timer = new Timer();
Handler handler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
setTitle("hear me?");
break;
}
super.handleMessage(msg);
}
};
//定义Task
TimerTask task = new TimerTask(){
public void run() {
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timer.schedule(task, 10000);
}
}
TextView
public void Example() {
readFromBLue();
saveLocale(Object o, new SaveSuccessListener(){
void success(String info){
//set info to TextView
Message message = new Message();
message.what = 100;
Bundle bundle = new Bundle();
bundle.putString("info" info);
message.setData(bundle);
handler.sendMessage(message);
}
});
}
public void saveLocale(Object o, SaveSuccessListener listener) {
//save actione done
if(listener != null) {
//Get info from database
listener.success(String info);
}
}
public interface SaveSuccessListener {
void success(String info);
}
private final Handler.Callback callback = new Handler.Callback() {
@Override
public boolean handleMessage(@NonNull Message msg) {
if (msg.what == 100) {
textView.setText(msg.getData().getString("info"));
}
return false;
}
};
private final Handler handler = new Handler(Looper.myLooper(), callback);
@Override
public void onDestroyView() {
super.onDestroyView();
handler.removeCallbacksAndMessages(callback);
binding = null;
}