步步为营_Android开发课[29]_用户界面之SeekBar(拖动条)

Focus on technology, enjoy life！—— QQ：804212028
浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305

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• 主题：用户界面之SeekBar(拖动条)
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SeekBar拖动条（实例）：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     >         <SeekBar                    android:id="@+id/seek"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:max="100"             android:progress="50"         />         <TextView             android:id="@+id/progress"             android:layout_width="fill_parent"             android:layout_height="wrap_content"         />         <TextView              android:id="@+id/tracking"             android:layout_width="fill_parent"             android:layout_height="wrap_content"         /> </LinearLayout>

MainActivity.java:

import android.app.Activity;import android.os.Bundle;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.TextView;public class MainActivity extends Activity {        SeekBar mSeekBar;        TextView mProgressText;        TextView mTrackingText;        @Override        public void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                setContentView(R.layout.activity_main);                //取得SeekBar对象                mSeekBar = (SeekBar) findViewById(R.id.seek);                mSeekBar.setOnSeekBarChangeListener(new Listener());                mProgressText = (TextView) findViewById(R.id.progress);                mTrackingText = (TextView) findViewById(R.id.tracking);        }     class Listener implements OnSeekBarChangeListener{        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {                //progress为当前数值的大小                mProgressText.setText("当前值:" + progress);        }        @Override        //在拖动中会调用此方法        public void onStartTrackingTouch(SeekBar seekBar) {                mTrackingText.setText("正在调节");        }        @Override        //停止拖动        public void onStopTrackingTouch(SeekBar seekBar) {                mTrackingText.setText("停止调节");        }     }}

运行结果：

Focus on technology, enjoy life！—— QQ：804212028
浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305