安卓--拖动条(SeekBar)实例
main.xml代码如下:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <SeekBar android:id="@+id/seekbar" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/text" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="vertical" /> </LinearLayout>
.java代码如下:
package org.lxh.demo; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.content.DialogInterface; import android.os.Bundle; import android.text.method.ScrollingMovementMethod; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.Button; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.Spinner; import android.widget.TextView; public class Hello extends Activity { private SeekBar seek = null; private TextView text = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 生命周期方法 super.setContentView(R.layout.main); // 设置要使用的布局管理器 this.seek = (SeekBar) super.findViewById(R.id.seekbar); this.text = (TextView) super.findViewById(R.id.text); this.text.setMovementMethod(ScrollingMovementMethod.getInstance()); this.seek.setOnSeekBarChangeListener(new OnSeekBarChangeListenerImpl()); } private class OnSeekBarChangeListenerImpl implements OnSeekBarChangeListener { public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { Hello.this.text.append("***正在拖动,当前值为:" + seekBar.getProgress() + "\n"); } public void onStartTrackingTouch(SeekBar seekBar) { text.append("***开始拖动,当前值为:" + seekBar.getProgress() + "\n"); } public void onStopTrackingTouch(SeekBar seekBar) { text.append("***停止拖动,当前值为:" + seekBar.getProgress() + "\n"); } } }
运行效果如下:
源码下载:http://download.csdn.net/detail/yayun0516/8379373
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