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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* 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 android.preference;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.View;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
/**
* @hide
*/
public class SeekBarPreference extends Preference
implements OnSeekBarChangeListener {
private int mProgress;
private int mMax;
private boolean mTrackingTouch;
public SeekBarPreference(
Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
TypedArray a = context.obtainStyledAttributes(
attrs, com.android.internal.R.styleable.ProgressBar, defStyleAttr, defStyleRes);
setMax(a.getInt(com.android.internal.R.styleable.ProgressBar_max, mMax));
a.recycle();
a = context.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.SeekBarPreference, defStyleAttr, defStyleRes);
final int layoutResId = a.getResourceId(
com.android.internal.R.styleable.SeekBarPreference_layout,
com.android.internal.R.layout.preference_widget_seekbar);
a.recycle();
setLayoutResource(layoutResId);
}
public SeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public SeekBarPreference(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.seekBarPreferenceStyle);
}
public SeekBarPreference(Context context) {
this(context, null);
}
@Override
protected void onBindView(View view) {
super.onBindView(view);
SeekBar seekBar = (SeekBar) view.findViewById(
com.android.internal.R.id.seekbar);
seekBar.setOnSeekBarChangeListener(this);
seekBar.setMax(mMax);
seekBar.setProgress(mProgress);
seekBar.setEnabled(isEnabled());
}
@Override
public CharSequence getSummary() {
return null;
}
@Override
protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
setProgress(restoreValue ? getPersistedInt(mProgress)
: (Integer) defaultValue);
}
@Override
protected Object onGetDefaultValue(TypedArray a, int index) {
return a.getInt(index, 0);
}
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() != KeyEvent.ACTION_UP) {
if (keyCode == KeyEvent.KEYCODE_PLUS
|| keyCode == KeyEvent.KEYCODE_EQUALS) {
setProgress(getProgress() + 1);
return true;
}
if (keyCode == KeyEvent.KEYCODE_MINUS) {
setProgress(getProgress() - 1);
return true;
}
}
return false;
}
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;
}
/**
* 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) {
if (fromUser && !mTrackingTouch) {
syncProgress(seekBar);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
mTrackingTouch = true;
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
mTrackingTouch = false;
if (seekBar.getProgress() != mProgress) {
syncProgress(seekBar);
}
}
@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.
*
* 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);
}
@SuppressWarnings("unused")
public static final Parcelable.Creator CREATOR =
new Parcelable.Creator() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}