用代码创建视图

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();
			}
		});
	}


}