学步园

先上效果图：

当滚动到底部时，自动加载更多内容。

解决思路：

1、TextView外嵌套一个ScrollView；

2、监听ScrollView的滚动事件；

3、判断手机是否滚动到底部

4、追加内容

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="${packageName}.${activityClass}" >

    <ScrollView
        android:id="@+id/scroll"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scrollbars="none" >

        <TextView
            android:id="@+id/text"
            android:lineSpacingExtra="8dp"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:text="@string/hello_world"
            android:textSize="20dp" />
    </ScrollView>

</RelativeLayout>

Java代码

package com.example.scrollviewdemo;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ScrollView;
import android.widget.TextView;

public class MainActivity extends Activity {

	private TextView textView;
	private ScrollView scrollView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		textView = (TextView) findViewById(R.id.text);
		scrollView = (ScrollView) findViewById(R.id.scroll);
		textView.setText(getString(R.string.text));

		scrollView.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				// TODO Auto-generated method stub
				switch (event.getAction()) {
				case MotionEvent.ACTION_MOVE:
					// getScrollY()是滚动条距离页面顶端的距离
					// getMeasuredHeight()是屏幕顶端距离页面顶端的距离
					// getHeight()是屏幕高度
					int y = scrollView.getScrollY();
					if (y <= 0) {
						Log.i("Main", "正在顶部");
					} else if (scrollView.getChildAt(0).getMeasuredHeight() <= y + scrollView.getHeight()) {
						Log.i("Main", "已经滚动到底部");
						Log.i("Main", "MeasuredHeight:" + scrollView.getMeasuredHeight() + ",ScrollY:" + y + ",Height:" + scrollView.getHeight());
						// 追加内容
						textView.append(getString(R.string.text));
					}
					break;
				}

				return false;
			}
		});
	}
}