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 */@Overrideprotected 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trueint 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returnView 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truesRingtone.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 */@Overrideprotected 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.MySeekBarPreferenceandroid: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>