首页 > 代码库 > 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
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); } }}
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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