SoundView.java
package com.zh_weir.videoplayer;
import com.zh_weir.videoplayer.R;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.media.AudioManager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class SoundView extends View{
public final static String TAG = "SoundView";
private Context mContext;
private Bitmap bm , bm1;
private int bitmapWidth , bitmapHeight;
private int index;
private OnVolumeChangedListener mOnVolumeChangedListener;
private final static int HEIGHT = 11;
public final static int MY_HEIGHT = 163;
public final static int MY_WIDTH = 44;
public interface OnVolumeChangedListener{
public void setYourVolume(int index);
}
public void setOnVolumeChangeListener(OnVolumeChangedListener l){ mOnVolumeChangedListener = l;
}
public SoundView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle);
mContext = context;
// TODO Auto-generated constructor stub
init();
}
public SoundView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
// TODO Auto-generated constructor stub
init();
}
public SoundView(Context context) {
super(context);
mContext = context;
// TODO Auto-generated constructor stub
init();
}
private void init(){
bm = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.sound_line);
bm1 = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.sound_line1);
bitmapWidth = bm.getWidth();
bitmapHeight = bm.getHeight();
//setIndex(5);
AudioManager am = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
setIndex(am.getStreamVolume(AudioManager.STREAM_MUSIC));
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
int y = (int) event.getY();
int n = y * 15 / MY_HEIGHT;
setIndex(15-n);
Log.d(TAG, "setIndex: "+(15-n));
return true;
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
int reverseIndex = 15 - index;
for(int i = 0;i!=reverseIndex;++i){
canvas.drawBitmap(bm1, new Rect(0,0,bitmapWidth,bitmapHeight),
new Rect(0,i*HEIGHT,bitmapWidth,i*HEIGHT+bitmapHeight), null);
}
for(int i = reverseIndex;i!=15;++i){
canvas.drawBitmap(bm, new Rect(0,0,bitmapWidth,bitmapHeight),
new Rect(0,i*HEIGHT,bitmapWidth,i*HEIGHT+bitmapHeight), null);
}
super.onDraw(canvas);
}
private void setIndex(int n){
if(n>15){
n = 15;
}
else if(n<0){
n = 0;
}
if(index!=n){
index = n;
if(mOnVolumeChangedListener!=null){
mOnVolumeChangedListener.setYourVolume(n);
}
}
invalidate();
}
}
