Hook up the volume parameter to a slider preference dialog.

android/src/com/reecedunn/espeak/SeekBarPreference.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2013 Reece H. Dunn
+ *
+ * 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.reecedunn.espeak;
+
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.SharedPreferences;
+import android.preference.DialogPreference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.SeekBar;
+
+public class SeekBarPreference extends DialogPreference
+{
+    private SeekBar mSeekBar;
+
+    private int mProgress = 0;
+    private int mMin = 0;
+    private int mMax = 100;
+
+    public void setProgress(int progress) {
+        mProgress = progress + mMin;
+        String text = Integer.toString(mProgress);
+        callChangeListener(text);
+    }
+
+    public int getProgress() {
+        return mProgress;
+    }
+
+    public void setMin(int min) {
+        mProgress -= mMin;
+        mMin =  min;
+        mProgress += mMin;
+        String text = Integer.toString(mProgress);
+        callChangeListener(text);
+    }
+
+    public int getMin() {
+        return mMin;
+    }
+
+    public void setMax(int max) {
+        mMax =  max;
+    }
+
+    public int getMax() {
+        return mMax;
+    }
+
+    public SeekBarPreference(Context context, AttributeSet attrs, int defStyle)
+    {
+        super(context, attrs, defStyle);
+        setDialogLayoutResource(R.layout.seekbar_preference);
+        setPositiveButtonText(android.R.string.ok);
+        setNegativeButtonText(android.R.string.cancel);
+    }
+
+    public SeekBarPreference(Context context, AttributeSet attrs)
+    {
+        this(context, attrs, 0);
+    }
+
+    public SeekBarPreference(Context context)
+    {
+        this(context, null);
+    }
+
+    @Override
+    protected View onCreateDialogView() {
+        View root = super.onCreateDialogView();
+        mSeekBar = (SeekBar)root.findViewById(R.id.seekBar);
+        return root;
+    }
+
+    @Override
+    protected void onBindDialogView(View view) {
+        mSeekBar.setMax(mMax - mMin);
+        mSeekBar.setProgress(mProgress + mMin);
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        switch (which) {
+            case DialogInterface.BUTTON_POSITIVE:
+                mProgress = mSeekBar.getProgress() + mMin;
+                String text = Integer.toString(mProgress);
+                callChangeListener(text);
+                SharedPreferences.Editor editor = getSharedPreferences().edit();
+                editor.putString(getKey(), text);
+                editor.commit();
+                break;
+        }
+        super.onClick(dialog, which);
+    }
+}