Button的onClick属性用法：

Layout：

activity：

package com.away.btnonclick;

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 {

	private TextView txtViewId;
	private Button btnId;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        txtViewId=(TextView)findViewById(R.id.txtViewId);
        btnId=(Button)findViewById(R.id.btnId);
    }

    public void On_Click(View v){
    	txtViewId.setText("hello_away!");
    }
  
}