Android(安卓)之 SeekBar用法介绍

拖动条：

布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/gridView"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent" >    <EditText        android:id="@+id/font"        android:layout_width="match_parent"        android:layout_height="300dp"        android:ems="10"        android:lines="5"        android:text="看我大小，别翻眼..."        android:inputType="textMultiLine" >        <requestFocus />    </EditText>        <SeekBar         android:id="@+id/seekBar"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:max="100"        android:scrollbarStyle="insideOverlay"        android:progress="1"        /></LinearLayout>

主程序入口：

package com.example.advancedview;import android.app.Activity;import android.os.Bundle;import android.widget.EditText;import android.widget.SeekBar;import android.widget.Toast;import android.widget.SeekBar.OnSeekBarChangeListener;/** * SeekBar 功能演示， 拖动来改变字体的大小 * @author Administrator * */public class SeekBarActivity extends Activity {//声明变量private SeekBar seekBar;private EditText font;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.seek_bar_layout);font = (EditText) findViewById(R.id.font);seekBar = (SeekBar) findViewById(R.id.seekBar);seekBar.setOnSeekBarChangeListener(seekListerner);}// 拖动条事件private OnSeekBarChangeListener seekListerner = new OnSeekBarChangeListener() {// 拖动条停止执行public void onStopTrackingTouch(SeekBar seekBar) {Toast.makeText(SeekBarActivity.this, "停止了:"+seekBar.getProgress(), 1000).show();}// 开始执行public void onStartTrackingTouch(SeekBar seekBar) {Toast.makeText(SeekBarActivity.this, "开始了:"+seekBar.getProgress(), 1000).show();}// 拖动中public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {font.setTextSize(progress); // 改变字体的大小}};}

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