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我有一个应用程序在位图上放置一个效果。当用户滑动滑杆时，效应的失真水平增加/减少，然后重新绘制位图。我的自定义视图类称为TouchView，并且此类获取位图并调用处理图像的Filters类的方法。我有帮助实施asyncTask来加速处理，但无济于事。 AsyncTask是否正确执行。谢谢马特。AsyncTask应用程序仍在缓慢运行
public class TouchView extends View{
private File tempFile;
private byte[] imageArray;
private Bitmap bgr;
private Bitmap bm;
private Bitmap bgr2 = null;;
private Paint pTouch;
private int centreX = 1;
private int centreY = 1;
private int radius = 50;
private int Progress = 1;
private static final String TAG = "*********TouchView";
private Filters f = null;
private boolean AsyncRunning = false;
public TouchView(Context context) {
super(context);
// TouchView(context, null);
}
public TouchView(Context context, AttributeSet attr) {
super(context,attr);
//.....code that gets the bitmap from camera and sdcard
bm = BitmapFactory.decodeByteArray(imageArray, 0, imageArray.length, bfo);
bgr = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
bgr = bm.copy(bm.getConfig(), true);
bgr2 = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
// instantiate the image processing class
f = new Filters();
}// end of touchView constructor
public void findCirclePixels(){
//set level of distortion
float prog = (float)Progress/150000;
// call processing method on bitmap
bgr2 = f.barrel(bgr,prog);
}// end of changePixel()
}//end of onTouchEvent
public void initSlider(final HorizontalSlider slider)
{
Log.e(TAG, "******setting up slider*********** ");
slider.setOnProgressChangeListener(changeListener);
}
private OnProgressChangeListener changeListener = new OnProgressChangeListener() {
@Override
public void onProgressChanged(View v, int progress) {
// TODO Auto-generated method stub
setProgress(progress);
Log.e(TAG, "***********progress = "+Progress);
}
};
private class MyTask extends AsyncTask<Void, Void, Void> {
protected void onPreExecute() {
}
@Override
protected Void doInBackground(Void... params) {
TouchView.this.findCirclePixels();
return null;
}
protected void onPostExecute(Void result) {
TouchView.this.invalidate();
}
}
@Override
public void onDraw(Canvas canvas){
super.onDraw(canvas);
canvas.drawBitmap(bgr2, 0, 0, null);
}//end of onDraw
protected void setProgress(int progress2) {
this.Progress = progress2;
new MyTask().execute();
}
}
。
[更新] 这就是我现在得到的。不幸的是，该应用现在运行速度较慢你有任何进一步的想法，我可以尝试？
public class TouchView extends View{
private File tempFile;
private byte[] imageArray;
private Bitmap bgr;
private Bitmap bm;
private Bitmap bgr2 = null;;
private Paint pTouch;
private int centreX = 1;
private int centreY = 1;
private int radius = 50;
private int Progress = 1;
private static final String TAG = "*********TouchView";
private Filters f = null;
private boolean AsyncRunning = false;
private MyTask mt = null;
public TouchView(Context context) {
super(context);
// TouchView(context, null);
}
public TouchView(Context context, AttributeSet attr) {
super(context,attr);
tempFile = new File(Environment.getExternalStorageDirectory().
getAbsolutePath() + "/"+"image.jpg");
imageArray = new byte[(int)tempFile.length()];
try{
InputStream is = new FileInputStream(tempFile);
BufferedInputStream bis = new BufferedInputStream(is);
DataInputStream dis = new DataInputStream(bis);
int i = 0;
while (dis.available() > 0) {
imageArray[i] = dis.readByte();
i++;
}
dis.close();
} catch (Exception e) {
e.printStackTrace();
}
BitmapFactory.Options bfo = new BitmapFactory.Options();
bfo.inSampleSize = 1;
bm = BitmapFactory.decodeByteArray(imageArray, 0, imageArray.length, bfo);
bgr = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
bgr = bm.copy(bm.getConfig(), true);
bgr2 = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
f = new Filters();
}// end of touchView constructor
public void findCirclePixels(){
float prog = (float)Progress/150000;
bgr2 = f.barrel(bgr,prog);
}// end of changePixel()
public void initSlider(final HorizontalSlider slider)
{
Log.e(TAG, "******setting up slider*********** ");
slider.setOnProgressChangeListener(changeListener);
}
private OnProgressChangeListener changeListener = new OnProgressChangeListener() {
@Override
public void onProgressChanged(View v, int progress) {
// TODO Auto-generated method stub
setProgress(progress);
Log.e(TAG, "***********progress = "+Progress);
}
};
private class MyTask extends AsyncTask<Void, Void, Void> {
protected void onPreExecute() {
}
@Override
protected Void doInBackground(Void... params) {
TouchView.this.findCirclePixels();
return null;
}
protected void onPostExecute(Void result) {
while(!isCancelled()){
TouchView.this.invalidate();
}
mt.cancel(true);
}
}
@Override
public void onDraw(Canvas canvas){
super.onDraw(canvas);
canvas.drawBitmap(bgr2, 0, 0, null);
canvas.drawCircle(centreX, centreY, radius,pTouch);
}//end of onDraw
protected void setProgress(int progress2) {
this.Progress = progress2;
mt = new MyTask();
mt.execute();
AsyncRunning = true;
}
}
。
[更新2]
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ProgressBar;
public class HorizontalSlider extends ProgressBar {
private OnProgressChangeListener listener;
private static int padding = 2;
public interface OnProgressChangeListener {
void onProgressChanged(View v, int progress);
}
/*
public HorizontalSlider(Context context, AttributeSet attrs,
Map inflateParams, int defStyle) {
super(context, attrs, inflateParams, defStyle);
}
public HorizontalSlider(Context context, AttributeSet attrs,
Map inflateParams) {
super(context, attrs, inflateParams, android.R.attr.progressBarStyleHorizontal);
}*/
public HorizontalSlider(Context context) {
super(context);
}
public HorizontalSlider(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
public void setOnProgressChangeListener(OnProgressChangeListener l) {
listener = l;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN
|| action == MotionEvent.ACTION_MOVE) {
float x_mouse = event.getX() - padding;
float width = getWidth() - 2*padding;
int progress = Math.round((float) getMax() * (x_mouse/width));
if (progress < 0)
progress = 0;
this.setProgress(progress);
if (listener != null)
listener.onProgressChanged(this, progress);
}
return true;
}
}
。
[更新3]
嗨，好，我改变了我的代码，你amendements并改变了我几行这样的观点是通过增加TouchView.this.invalidate（）等关于更新我设置horizontalSlider在设置进度时仅检查ACTION_UP。这样用户可以移动滑杆，但只有当用户释放滑杆时视图才会失效。我希望位图会随着条移动而实时更新，但图像处理类“过滤器”需要大约20秒来处理不好的位图。我想我需要在后者上工作，因为我相信你应该能够比这更快地处理位图！:)。如果这与AsyncTask一样快，那么我可能不得不考虑首先绘制相机位图而不失真，然后创建另一个位图覆盖图，其中只有圆效果存在。这种方式过滤鳕鱼只有1/3的像素可以循环通过？我会发布代码以确保它是如何建议的。
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import com.tecmark.HorizontalSlider.OnProgressChangeListener;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.PorterDuff.Mode;
import android.os.AsyncTask;
import android.os.Environment;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class TouchView extends View{
private File tempFile;
private byte[] imageArray;
private Bitmap bgr;
private Bitmap bm;
private Bitmap bgr2 = null;;
private Paint pTouch;
private int centreX = 1;
private int centreY = 1;
private int radius = 50;
private int Progress = 1;
private static final String TAG = "*********TouchView";
private Filters f = null;
private boolean AsyncRunning = false;
private MyTask mt = null;
public TouchView(Context context) {
super(context);
// TouchView(context, null);
}
public TouchView(Context context, AttributeSet attr) {
super(context,attr);
tempFile = new File(Environment.getExternalStorageDirectory().
getAbsolutePath() + "/"+"image.jpg");
imageArray = new byte[(int)tempFile.length()];
try{
InputStream is = new FileInputStream(tempFile);
BufferedInputStream bis = new BufferedInputStream(is);
DataInputStream dis = new DataInputStream(bis);
int i = 0;
while (dis.available() > 0) {
imageArray[i] = dis.readByte();
i++;
}
dis.close();
} catch (Exception e) {
e.printStackTrace();
}
BitmapFactory.Options bfo = new BitmapFactory.Options();
bfo.inSampleSize = 1;
bm = BitmapFactory.decodeByteArray(imageArray, 0, imageArray.length, bfo);
bgr = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
bgr = bm.copy(bm.getConfig(), true);
bgr2 = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
f = new Filters();
pTouch = new Paint(Paint.ANTI_ALIAS_FLAG);
pTouch.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT));
pTouch.setColor(Color.TRANSPARENT);
pTouch.setStyle(Paint.Style.STROKE);
}// end of touchView constructor
public void findCirclePixels(){
float prog = (float)Progress/150000;
bgr2 = f.barrel(bgr,prog);
}// end of changePixel()
public void initSlider(final HorizontalSlider slider)
{
// Log.e(TAG, "******setting up slider*********** ");
slider.setOnProgressChangeListener(changeListener);
}
private OnProgressChangeListener changeListener = new OnProgressChangeListener() {
@Override
public void onProgressChanged(View v, int progress) {
// TODO Auto-generated method stub
setProgress(progress);
//TouchView.this.Progress = progress;
if (mt != null) {
mt.cancel(true);
}
mt = new MyTask();
mt.execute();
}
};
private class MyTask extends AsyncTask<Void, Void, Void> {
protected void onPreExecute() {
// Log.e(TAG, "***********in PREEXECUTE");
}
@Override
protected Void doInBackground(Void... params) {
// Log.e(TAG, "***********in DOINBACKGROUND");
if(!mt.isCancelled()){
// Log.e(TAG, "***********in doInBackgroud about to call fcp()");
// Log.e(TAG, "***********in doinbackground asyncStatus = "+mt.getStatus());
TouchView.this.findCirclePixels();
Log.e(TAG, "***********in doinbackground fcp() called!!!!");
}
return null;
}
protected void onPostExecute(Void result) {
// Log.e(TAG, "***********in POSTEXECUTE");
if(!isCancelled()){
// Log.e(TAG, "***********in postExecute task not canclled and about to invalidate");
// Log.e(TAG, "***********in postexecute asyncStatus = "+mt.getStatus());
TouchView.this.invalidate();
// Log.e(TAG, "***********in postexecute invalidate() called!!!!");
// Log.e(TAG, "***********in postexecute asyncStatus = "+mt.getStatus());
}
}
}// end of mytask
@Override
public void onDraw(Canvas canvas){
super.onDraw(canvas);
canvas.drawBitmap(bgr2, 0, 0, null);
canvas.drawCircle(centreX, centreY, radius,pTouch);
}//end of onDraw
protected void setProgress(int progress2) {
//Log.e(TAG, "***********in SETPROGRESS");
this.Progress = progress2;
//Log.e(TAG, "***********in setprogress progress = "+Progress);
//Log.e(TAG, "***********in setProgress about to create mytask ");
mt = new MyTask();
//Log.e(TAG, "***********in setprogress about to execute mytask");
//Log.e(TAG, "***********in setprogress asyncStatus = "+mt.getStatus());
mt.execute();
// Log.e(TAG, "***********in setprogress asyncStatus = "+mt.getStatus());
// Log.e(TAG, "***********in setprogress mytask executed!!!!! ");
}
}
。
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_UP
/*|| action == MotionEvent.ACTION_MOVE*/) {
float x_mouse = event.getX() - padding;
float width = getWidth() - 2*padding;
int progress = Math.round((float) getMax() * (x_mouse/width));
if (progress < 0)
progress = 0;
this.setProgress(progress);
if (listener != null)
listener.onProgressChanged(this, progress);
}
return true;
}
}
看看这个：http://stackoverflow.com/questions/5765904/touch-release-在Android中的方法 - 你需要保存每个触摸的“进度”，但不要调用'listener.onProgressChanged（this，progress）'直到你看到ACTION_UP' – 2011-06-12 21:26:55
@tanner感谢您的更新，更新了代码。它现在只发射一个异步，但仍然运行缓慢（可能是由于过滤器类） – turtleboy 2011-06-13 11:16:00
@turtuleboy这是非常可能的。希望它至少比以前跑得快。我的DroidX上的图像处理速度相对较慢，而且它是那里更强大的手机之一。所以你可能会碰到一个硬件限制。我不能说可以对过滤进行的任何优化，但听起来您至少在正确的轨道上。 – 2011-06-13 12:47:49