15 动态添加显示控件 即 动态刷新显示

效果图



布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

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

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity" >

<EditText

android:id="@+id/et_name"

android:layout_width="80dip"

android:layout_height="wrap_content" />

<EditText

android:id="@+id/et_age"

android:layout_width="80dip"

android:layout_height="wrap_content"

android:layout_toRightOf="@id/et_name" />

<Button

android:id="@+id/btn_add"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_toRightOf="@id/et_age"

android:text="添加学生" />

<ScrollView // 滚动显示 注意里面只可包裹一个显示对象 即 1个LinearLayout 或者其它。

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:layout_below="@id/et_name" >

<LinearLayout

android:id="@+id/ll_student_list"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

</LinearLayout>

</ScrollView>

</RelativeLayout>

实现方法：

package com.itheima27.refreshview;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

private EditText etName;

private EditText etAge;

private LinearLayout llStudentList;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

etName = (EditText) findViewById(R.id.et_name);

etAge = (EditText) findViewById(R.id.et_age);

llStudentList = (LinearLayout) findViewById(R.id.ll_student_list);

findViewById(R.id.btn_add).setOnClickListener(this);

}

@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;

}

@Override

public void onClick(View v) {

String name = etName.getText().toString();

String age = etAge.getText().toString();

// 添加到线性布局中一个对象

TextView child = new TextView(this);

child.setText("\t" + name + "\t" + age);

child.setTextSize(23);

llStudentList.addView(child);

}

}