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/*
* Copyright (C) 2011 Google Inc.
*
* 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.android.inputmethod.voice;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.util.AttributeSet;
import android.widget.ImageView;
import com.android.inputmethod.latin.R;
/**
* A widget which shows the volume of audio using a microphone icon
*/
public class SoundIndicator extends ImageView {
@SuppressWarnings("unused")
private static final String TAG = "SoundIndicator";
private static final float UP_SMOOTHING_FACTOR = 0.9f;
private static final float DOWN_SMOOTHING_FACTOR = 0.4f;
private static final float AUDIO_METER_MIN_DB = 7.0f;
private static final float AUDIO_METER_DB_RANGE = 20.0f;
private static final long FRAME_DELAY = 50;
private Bitmap mDrawingBuffer;
private Canvas mBufferCanvas;
private Bitmap mEdgeBitmap;
private float mLevel = 0.0f;
private Drawable mFrontDrawable;
private Paint mClearPaint;
private Paint mMultPaint;
private int mEdgeBitmapOffset;
private Handler mHandler;
private Runnable mDrawFrame = new Runnable() {
public void run() {
invalidate();
mHandler.postDelayed(mDrawFrame, FRAME_DELAY);
}
};
public SoundIndicator(Context context) {
this(context, null);
}
public SoundIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
mFrontDrawable = getDrawable();
BitmapDrawable edgeDrawable =
(BitmapDrawable) context.getResources().getDrawable(R.drawable.vs_popup_mic_edge);
mEdgeBitmap = edgeDrawable.getBitmap();
mEdgeBitmapOffset = mEdgeBitmap.getHeight() / 2;
mDrawingBuffer =
Bitmap.createBitmap(mFrontDrawable.getIntrinsicWidth(),
mFrontDrawable.getIntrinsicHeight(), Config.ARGB_8888);
mBufferCanvas = new Canvas(mDrawingBuffer);
// Initialize Paints.
mClearPaint = new Paint();
mClearPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
mMultPaint = new Paint();
mMultPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
mHandler = new Handler();
}
@Override
public void onDraw(Canvas canvas) {
//super.onDraw(canvas);
float w = getWidth();
float h = getHeight();
// Clear the buffer canvas
mBufferCanvas.drawRect(0, 0, w, h, mClearPaint);
// Set its clip so we don't draw the front image all the way to the top
Rect clip = new Rect(0,
(int) ((1.0 - mLevel) * (h + mEdgeBitmapOffset)) - mEdgeBitmapOffset,
(int) w,
(int) h);
mBufferCanvas.save();
mBufferCanvas.clipRect(clip);
// Draw the front image
mFrontDrawable.setBounds(new Rect(0, 0, (int) w, (int) h));
mFrontDrawable.draw(mBufferCanvas);
mBufferCanvas.restore();
// Draw the edge image on top of the buffer image with a multiply mode
mBufferCanvas.drawBitmap(mEdgeBitmap, 0, clip.top, mMultPaint);
// Draw the buffer image (on top of the background image)
canvas.drawBitmap(mDrawingBuffer, 0, 0, null);
}
/**
* Sets the sound level
*
* @param rmsdB The level of the sound, in dB.
*/
public void setRmsdB(float rmsdB) {
float level = ((rmsdB - AUDIO_METER_MIN_DB) / AUDIO_METER_DB_RANGE);
level = Math.min(Math.max(0.0f, level), 1.0f);
// We smooth towards the new level
if (level > mLevel) {
mLevel = (level - mLevel) * UP_SMOOTHING_FACTOR + mLevel;
} else {
mLevel = (level - mLevel) * DOWN_SMOOTHING_FACTOR + mLevel;
}
invalidate();
}
public void start() {
mHandler.post(mDrawFrame);
}
public void stop() {
mHandler.removeCallbacks(mDrawFrame);
}
}
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