android 按钮点击测试

 

package test2.com;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

public class Test2Activity extends Activity {
    /** Called when the activity is first created. */
	//置于一个全局的TextView,
	public TextView tv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        
        Button start = (Button)findViewById(R.id.button1);
        Button finish = (Button)findViewById(R.id.button2);
        //把界面中的textView赋给tv
        tv =  (TextView)findViewById(R.id.textView2);
        TextView tv1 = (TextView)findViewById(R.id.textView2);
        
        start.setOnClickListener(new OnClickListener(){

			public void onClick(View v) {
				// TODO Auto-generated method stub
				//此时的tv是全局的，
				tv.setText("start");
				//tv1 在onCreate中产生的，所以下面的语句会抱错！！
				//------------------//
				//tv1.setText("inner Text");
				//-------------------//
				
			}
        	
        });
        
        //
        finish.setOnClickListener(new View.OnClickListener() {
			
			public void onClick(View v) {
				// TODO Auto-generated method stub
				tv.setText("finish");
			}
		});
        
        
        
    }
    
  
    
}

 

 

以上程序主代码

 

在res/main.xml中加一个textview,2个button,分别设置text为start,stop

  点击start,stop分别显示start,stop  ,~~~~~~~