Android--自定义SeekBarPreference控件

运行截图：

 

 

 

java代码：

 

package cn.mrzhu.test23;


import android.os.Bundle;
import android.preference.PreferenceActivity;

/**
 * 继承PreferenceActivity，设置布局
 * @author ZLQ
 *
 */
public class Main extends PreferenceActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.myseek);
    }
}

 

 

 

自定义控件代码：

 

package cn.mrzhu.test23;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.CheckBox;
import android.widget.SeekBar;

/**
 * 继承DialogPreference，自定义SeekBarPreference控件
 * @author ZLQ
 *
 */
public class MySeekBarPreference extends DialogPreference{
	
	Context con;
	SeekBar sRingtone,sMedia,sAlarm;
	CheckBox cNotifications;

	public MySeekBarPreference(Context context, AttributeSet attrs) {
		super(context, attrs);
		//在构造器中为con赋值
		con = context;
	}
	
	/**
	 * 在对话框弹出时执行取数据并给进度条和复选框设置值的操作
	 */
	@Override
	protected View onCreateDialogView() {
		//通过上下方取得SharedPreferences对象
		SharedPreferences sharedPreferences = con.getSharedPreferences("seek", Context.MODE_PRIVATE);
		//从seek.xml文件中取出之前保存的数据，如之前没有保存过数据，则默认进度为50，checkbox默认为true
		int ringtone = sharedPreferences.getInt("ringtone", 50);
		int media = sharedPreferences.getInt("media", 50);
		int alarm = sharedPreferences.getInt("alarm", 50);
		boolean isChecked = sharedPreferences.getBoolean("notifications", true);
		//通过转换器将布局转换成View对象并return
		View view = LayoutInflater.from(con).inflate(R.layout.seek, null);
		//取得进度条和复选框对象
		sRingtone = (SeekBar) view.findViewById(R.id.ringtone);
		sMedia = (SeekBar) view.findViewById(R.id.media);
		sAlarm = (SeekBar) view.findViewById(R.id.alarm);
		cNotifications = (CheckBox) view.findViewById(R.id.notifications);
		//将从seek.xml文件中取出的数据设置给进度条和复选框 ，如之前没有保存过数据，则默认进度为50，checkbox默认为true
		sRingtone.setProgress(ringtone);
		sMedia.setProgress(media);
		sAlarm.setProgress(alarm);
		cNotifications.setChecked(isChecked);
		return view;
	}
	
	/**
	 * 在点击对话框ok按钮时取得进度条的值和复选框的状态，保存到seek.xml文件中
	 */
	@Override
	protected void onDialogClosed(boolean positiveResult) {
		//positiveResult为true则表示点击了ok按钮
		if(positiveResult){
			//取得进度条当前的进度和复选框的状态
			int ringtone = sRingtone.getProgress();
			int media = sMedia.getProgress();
			int alarm = sAlarm.getProgress();
			boolean isChecked = cNotifications.isChecked();
			SharedPreferences sharedPreferences = con.getSharedPreferences("seek", Context.MODE_PRIVATE);
			Editor editor = sharedPreferences.edit();
			editor.putInt("ringtone", ringtone);
			editor.putInt("media", media);
			editor.putInt("alarm", alarm);
			editor.putBoolean("notifications", isChecked);
			//提交数据
			editor.commit();
		}
		super.onDialogClosed(positiveResult);
	}
}

 

 

主界面myseek.xml代码：右键layou,新建Android  XML  File文件，选择Preference,在res文件夹下会自动生成xml文件夹

 

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 因为是自定义的控件，所以必须是包名点类名，否则系统找不到此控件  -->
	<cn.mrzhu.test23.MySeekBarPreference
		android:key="seek"
		android:dialogIcon="@drawable/icon"
		android:title="System Sound"
	/>
</PreferenceScreen>

 

弹出的对话框里的布局seek.xml的代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        style="@style/text"
        android:text="Ringtone" />

    <SeekBar
        android:id="@+id/ringtone"
        style="@style/seek" />

    <TextView
        style="@style/text"
        android:text="Media" />

    <SeekBar
        android:id="@+id/media"
        style="@style/seek" />

    <TextView
        style="@style/text"
        android:text="Alarm" />

    <SeekBar
        android:id="@+id/alarm"
        style="@style/seek" />

    <CheckBox
        android:id="@+id/notifications"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:checked="true"
        android:text="Use incoming call volume for notifications" />

</LinearLayout>

 

values文件夹下style.xml代码：

 

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="text">
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:paddingLeft">15dp</item>
    </style>

    <style name="seek" parent="@style/text">
        <item name="android:paddingRight">15dp</item>
        <item name="android:paddingTop">5dp</item>
        <item name="android:paddingBottom">5dp</item>
    </style>

</resources>