0423_mon_android周一老师上传的上课自己敲的代码

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android 

"
    xmlns:tools="http://schemas.android.com/tools 

"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.a04234.MainActivity">
    <TextView
        android:layout_gravity="center"
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:background="#FF0000"/>
    <TextView
        android:layout_gravity="center"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:background="#00FF00"/>
    <TextView
        android:layout_gravity="center"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="#FF0000"/>

    <TextView
        android:layout_gravity="center"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:background="#00FF00"/>
    <TextView
        android:layout_gravity="center"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="#FF0000"/>
    <TextView
        android:layout_gravity="center"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:background="#00FF00"/>
</FrameLayout>
15:46:59
Yongli 2018/4/23 15:46:59
Button btnOpen = (Button)findViewById(R.id.btnOpen);
        btnOpen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,
                        Main2Activity.class);
                /*intent.putExtra("name", "zhangsan");
                intent.putExtra("age", "18");*/
                Bundle bundle = new Bundle();
                bundle.putString("name", "zhangsan");
                bundle.putString("age", "18");
                intent.putExtras(bundle);