自己写的SeekBarPreference，可以实现seekbar滑动监听和设置默认进度和最大进度

我通过参考android源码，把这个烂尾的类写完了。具体实现了seekbar的数据自动存储，seekbar拖动时触发监听器，可以设置默认的进度和最大进度。先说使用的方式：

1.在xml文件中使用preference

<com.kale.floatbar.preference.MySeekBarPreference

            android:key="alpha"

            android:layout="@layout/prefs_list_item"

            android:title="透明度" />

2，在Java代码中找到preference然后设置数值或绑定监听器

　　　　  private MySeekBarPreference alphaSb

        alphaSb = (MySeekBarPreference) findPreference("alpha");//找到preference

        alphaSb.setDefaultProgressValue(100);//设置起始时的进度

        alphaSb.setMax(255);//设置最大的数值，不超过10000。如果超过了请在seekbarPreference源码中进行修改max值

        alphaSb.setOnSeekBarPrefsChangeListener(this);//设置监听器

3.设置监听器，这里的key是当前触发监听器的preference的key，这样可以区分是哪个seekbarPreference触发的监听器

    @Override

    public void onStopTrackingTouch(String key, SeekBar seekBar) {

    }

    @Override

    public void onStartTrackingTouch(String key, SeekBar seekBar) {

    }

    @Override

    public void onProgressChanged(String key, SeekBar seekBar, int progress, boolean fromUser) {

    }

最后是SeekbarPreference的源码：

/*

 * Copyright (C) 2011 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.kale.floatbar.preference;

import android.content.Context;

import android.os.Parcel;

import android.os.Parcelable;

import android.preference.Preference;

import android.util.AttributeSet;

import android.view.View;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.TextView;

import com.kale.floatbar.R;

public class MySeekBarPreference extends Preference implements OnSeekBarChangeListener{

    private TextView value;

    private int mProgress;

    private int mMax = 10000;//如果您的seekbar最大值超过了10000，那么在这里修改下即可。否则会被限制最大值为10000

    private boolean mTrackingTouch;

    private OnSeekBarPrefsChangeListener mListener = null;

    public MySeekBarPreference(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        setMax(mMax);

        setLayoutResource(R.layout.seekbar_prefs);

    }

    public MySeekBarPreference(Context context, AttributeSet attrs) {

        this(context, attrs, 0);

    }

    public MySeekBarPreference(Context context) {

        this(context, null);

    }

    @Override

    protected void onBindView(View view) {

        super.onBindView(view);

        SeekBar seekBar = (SeekBar) view.findViewById(R.id.seekbar);

        seekBar.setMax(mMax);

        seekBar.setProgress(mProgress);

        seekBar.setEnabled(isEnabled());

        seekBar.setOnSeekBarChangeListener(this);

        value = (TextView)view.findViewById(R.id.value);

        value.setText(String.valueOf(mProgress));

    }

    /** 设置默认的值

     * @param defaultValue

     */

    public void setDefaultProgressValue(int defaultValue) {

        if(getPersistedInt(-1) == -1) {

            //说明没有用户设定的值，所以设置初始值

            setProgress(defaultValue);

        }

    }

    @Override

    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {

        setProgress(restoreValue ? getPersistedInt(mProgress): (Integer) defaultValue);

    }

    public void setMax(int max) {

        if (max != mMax) {

            mMax = max;

            notifyChanged();

        }

    }

    public void setProgress(int progress) {

        setProgress(progress, true);

    }

    private void setProgress(int progress, boolean notifyChanged) {

        if (progress > mMax) {

            progress = mMax;

        }

        if (progress < 0) {

            progress = 0;

        }

        if (progress != mProgress) {

            mProgress = progress;

            persistInt(progress);

            if (notifyChanged) {

                notifyChanged();

            }

        }

    }

    public int getProgress() {

        return mProgress;

    }

    public void setOnSeekBarPrefsChangeListener(OnSeekBarPrefsChangeListener listener) {

        mListener = listener;

    }

    /**

     * @author:Jack Tony

     * @tips  :设置监听器

     * @date  :2014-8-17

     */

    public interface OnSeekBarPrefsChangeListener {

        //public void OnSeekBarChangeListener(SeekBar seekBar, boolean isChecked);

        public void onStopTrackingTouch(String key ,SeekBar seekBar) ;

        public void onStartTrackingTouch(String key ,SeekBar seekBar);

        public void onProgressChanged(String key ,SeekBar seekBar, int progress,boolean fromUser);

    }

    /**

     * Persist the seekBar's progress value if callChangeListener

     * returns true, otherwise set the seekBar's progress to the stored value

     */

    void syncProgress(SeekBar seekBar) {

        int progress = seekBar.getProgress();

        if (progress != mProgress) {

            if (callChangeListener(progress)) {

                setProgress(progress, false);

            } else {

                seekBar.setProgress(mProgress);

            }

        }

    }

    @Override

    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        //value.setText(seekBar.getProgress()+"");

        if (mListener != null) {

            mListener.onProgressChanged(getKey(),seekBar, progress, fromUser);

        }

        if (seekBar.getProgress() != mProgress) {

            syncProgress(seekBar);

        }

        if (fromUser && !mTrackingTouch) {

            syncProgress(seekBar);

        }

    }

    @Override

    public void onStartTrackingTouch(SeekBar seekBar) {

        if (mListener != null) {

            mListener.onStartTrackingTouch(getKey(),seekBar);

        }

        mTrackingTouch = true;

    }

    @Override

    public void onStopTrackingTouch(SeekBar seekBar) {

        if (mListener != null) {

            mListener.onStopTrackingTouch(getKey(),seekBar);

        }

        mTrackingTouch = false;

        if (seekBar.getProgress() != mProgress) {

            syncProgress(seekBar);

        }

        notifyHierarchyChanged();

    }

    @Override

    protected Parcelable onSaveInstanceState() {

        /*

         * Suppose a client uses this preference type without persisting. We

         * must save the instance state so it is able to, for example, survive

         * orientation changes.

         */

        final Parcelable superState = super.onSaveInstanceState();

        if (isPersistent()) {

            // No need to save instance state since it's persistent

            return superState;

        }

        // Save the instance state

        final SavedState myState = new SavedState(superState);

        myState.progress = mProgress;

        myState.max = mMax;

        return myState;

    }

    @Override

    protected void onRestoreInstanceState(Parcelable state) {

        if (!state.getClass().equals(SavedState.class)) {

            // Didn't save state for us in onSaveInstanceState

            super.onRestoreInstanceState(state);

            return;

        }

        // Restore the instance state

        SavedState myState = (SavedState) state;

        super.onRestoreInstanceState(myState.getSuperState());

        mProgress = myState.progress;

        mMax = myState.max;

        notifyChanged();

    }

    /**

     * SavedState, a subclass of {@link BaseSavedState}, will store the state

     * of MyPreference, a subclass of Preference.

     * <p>

     * It is important to always call through to super methods.

     */

    private static class SavedState extends BaseSavedState {

        int progress;

        int max;

        public SavedState(Parcel source) {

            super(source);

            // Restore the click counter

            progress = source.readInt();

            max = source.readInt();

        }

        @Override

        public void writeToParcel(Parcel dest, int flags) {

            super.writeToParcel(dest, flags);

            // Save the click counter

            dest.writeInt(progress);

            dest.writeInt(max);

        }

        public SavedState(Parcelable superState) {

            super(superState);

        }

    }

}

巴特西

自己写的SeekBarPreference，可以实现seekbar滑动监听和设置默认进度和最大进度

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