Android中动态向TextView传值的问题

Question

MainActivity的代码：

package com.example.androidsendnum;

import java.io.InterruptedIOException;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

int i;
int j;
boolean flag;
Thread thread = new Thread();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final Button bnSend =(Button)findViewById(R.id.send);
    final Button bnStop =(Button)findViewById(R.id.stop);
    TextView sendView =(TextView)findViewById(R.id.sendtext);
    TextView receiveView =(TextView)findViewById(R.id.receivetext);

    bnSend.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            flag=true;
            thread.start();
        }
    });

    bnStop.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub  
            flag=false;
        }
    });

    sendView.setText(i);
    receiveView.setText(i);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true; 
}

public void run() {
    // TODO Auto-generated method stub
    while(flag){
        for(i=1,j=0;j<100;i++,j++){
            try {
                thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}

}

但是在模拟器中就打不开

Answer 1

你想通过thread循环给textview赋值？

Android不允许在非主线程中操作UI。
所以你需要用到**handler** 处理、

MyHandler handler  = new MyHandler();

 handler.sendEmptyMessage(msg);

 ..
 ..
 ..

 private Class MyHandler extends Handler{

     @Override
    handlerMessage(Message msg){

        //此处处理你发送的handler，然后控制UI

    }

 }