关于Android WindowManager 中TextView不断赋值更新的问题

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关于Android WindowManager 中TextView不断赋值更新的问题0

package com.wujw;

import java.util.Random;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.TextView;

public class PaomadengActivity extends Activity {
	private final Random mGenerator = new Random();
	TextView tv;
	TextView tv1;
	WindowManager wm;
	 WindowManager.LayoutParams textViewparams1 = new WindowManager.LayoutParams();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     // TODO Auto-generated method stub
        textViewparams1.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
     				| WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
     		// params1.width = WindowManager.LayoutParams.FILL_PARENT;
     		// params1.height = WindowManager.LayoutParams.WRAP_CONTENT;
     		textViewparams1.width = 341;
     		textViewparams1.height = 390;
     		textViewparams1.alpha = 100;
     		textViewparams1.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL
     				| LayoutParams.FLAG_NOT_FOCUSABLE;
     		textViewparams1.gravity = Gravity.LEFT | Gravity.TOP;
     		// 以屏幕左上角为原点，设置x、y初始值
     		textViewparams1.x = 0;
     		textViewparams1.y = 300;
        
        tv = new TextView(this);
        tv1=(TextView) findViewById(R.id.editText1);
        wm =  (WindowManager) getApplicationContext().getSystemService(
				WINDOW_SERVICE);
        wm.addView(tv, textViewparams1);
        new T().start();
    }
    
    private Handler mh = new Handler(){

		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			if(msg.what==0){
				tv.setText(mGenerator.nextInt()+"");
				tv1.setText(mGenerator.nextInt()+"");
			}
			super.handleMessage(msg);
		}
    	
    };
    
    public class T extends Thread{
    	@Override
		public void run() {
			// ......处理比较耗时的操作
			while (true) {
				// 处理完成后给handler发送消息
				Message msg = new Message();
				msg.what = 0;
				mh.sendMessage(msg);
				try {
					T.sleep(1000);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
    }
}

WindowManager 中的Textview不断更新会上次和本次的值一起重叠起来出来，在xml中就不会。求解