package com.example.demo03linearlayoutdemo;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.ViewGroup;import android.widget.LinearLayout;import android.widget.TextView;public class MainActivity extends Activity {    //编程实现LinearLayout    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);//        LinearLayout linearLayout = new LinearLayout(this);//        //quick key alt+cmd+v//        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);////////        layoutParams.setLayoutDirection(LinearLayout.VERTICAL);////        LinearLayout.LayoutParams txtParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);//        TextView textView = new TextView(this);//        textView.setLayoutParams(txtParams);//        textView.setText("wwww.baidu.com");//        textView.setTextSize(20);////        linearLayout.addView(textView,txtParams);//        super.addContentView(linearLayout,layoutParams);                            }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    }