Question

android用线程设置TextView背景颜色时，程序崩溃

我用一个线程，来设置TextView的背景颜色，运行时我看见背景颜色变了，紧接着程序就崩溃了，百思不得其解，求教高手！
代码如下：
public class MainActivity extends Activity {
super.onCreate(savedInstanceState);
this.setProgressBarVisibility(true);
setContentView(R.layout.main);

btn1 = (Button)findViewById(R.id.Button01);
tv1 = (TextView)findViewById(R.id.TextView01);

btn1.setOnClickListener (new OnClickListener(){
@Override
public void onClick(View v) {
Thread th = new Thread(begin);
th.start();
}
};

Runnable begin = new Runnable(){
@Override
public void run(){
try{
Thread.sleep(2000);
tv1.setBackgroundColor(Color.RED);
}
catch(InterruptedException e){}
}
};
}

Answer 1

晕，你怎么能直接在子线程内更新ui啊，应该用handler来更新控件，代码给你改一下了
Runnable begin = new Runnable(){
@Override
public void run(){
try{
Thread.sleep(2000);
Message msg = new Message();
msg.what = 100;
this.mHandler.sendMessage(msg);

}
catch(InterruptedException e){}
}
};

private Handler mHandler = new Handler() {

public void handleMessage(Message msg) {
switch (msg.what) {
case 100:
tv1.setBackgroundColor(Color.RED);

break;

}
};