Android ScrollView的使用

ScrollView卷轴视图是指当拥有很多内容，一屏显示不完时，需要通过滚动跳来显示的视图.的使用：

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/ScrollView" android:layout_width="fill_parent"android:layout_height="wrap_content" android:scrollbars="vertical"><LinearLayout android:id="@+id/LinearLayout"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="wrap_content"><TextView android:id="@+id/TestView" android:layout_width="fill_parent"android:layout_height="wrap_content" android:text="TestView0" /><Button android:id="@+id/Button" android:text="Button0" android:layout_width="fill_parent"android:layout_height="wrap_content"></Button></LinearLayout></ScrollView>

package com.Aina.Android;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.LinearLayout;import android.widget.ScrollView;import android.widget.TextView;public class Test_ScrollView extends Activity {/** Called when the activity is first created. */private LinearLayout mLayout;private ScrollView sView;private final Handler mHandler = new Handler();@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// 创建一个线性布局mLayout = (LinearLayout) this.findViewById(R.id.LinearLayout);// 创建一个ScrollView对象sView = (ScrollView) this.findViewById(R.id.ScrollView);Button mBtn = (Button) this.findViewById(R.id.Button);mBtn.setOnClickListener(mClickListener);// 添加点击事件监听}public boolean onKeyDown(int keyCode, KeyEvent event){Button b = (Button) this.getCurrentFocus();int count = mLayout.getChildCount();Button bm = (Button) mLayout.getChildAt(count-1);if(keyCode==KeyEvent.KEYCODE_DPAD_UP && b.getId()==R.id.Button){bm.requestFocus();return true;}else if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN && b.getId()==bm.getId()){this.findViewById(R.id.Button).requestFocus();return true;}return false;}// Button事件监听,当点击第一个按钮时增加一个button和一个textviewprivate Button.OnClickListener mClickListener = new Button.OnClickListener() {private int index = 1;@Overridepublic void onClick(View v) {TextView tView = new TextView(Test_ScrollView.this);//定义一个TextViewtView.setText("TextView" + index);//设置TextView的文本信息//设置线性布局的属性LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);mLayout.addView(tView, params);//添加一个TextView控件Button button = new Button(Test_ScrollView.this);//定义一个Buttonbutton.setText("Button" + index);//设置Button的文本信息button.setId(index++);mLayout.addView(button, params);//添加一个Button控件mHandler.post(mScrollToButton);//传递一个消息进行滚动}};private Runnable mScrollToButton = new Runnable() {@Overridepublic void run() {int off = mLayout.getMeasuredHeight() - sView.getHeight();if (off > 0) {sView.scrollTo(0, off);//改变滚动条的位置}}};}

此示例中一个TextView和一个Button来实现自动滚动，当我们点击Button0时自动产生多个类似的项，如果一屏显示不完，则通过ScrollView来显示。

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