用纯JAVA代码来创建视图

package com.kale.codeview;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //定义一个父控件
        LinearLayout layout = new LinearLayout(this);
        //设置activity显示的layout
        super.setContentView(layout);
        //设置linearLayout的方向
        layout.setOrientation(LinearLayout.VERTICAL);
        //new 一个textview
        final TextView show = new TextView(this);
        //new 一个button
        Button bn = new Button(this);
        bn.setText(R.string.app_name);
        //设置button的排列方式
        bn.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));
        //添加视图
        layout.addView(show);
        layout.addView(bn);

        bn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO 自动生成的方法存根
                show.setText("Time is "+ new java.util.Date());
                Toast.makeText(MainActivity.this, "CodeView", 0).show();
            }
        });
    }

}