没有相应的工作进度的Android [英] Android progress not working accordingly
本文介绍了没有相应的工作进度的Android的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是新来的Android和Java。我一直对我的任务即，图像下载。在那里我与进度栏下载图像，并在网格中显示它们。我创建了两个类
1. URLImageAdapter
2. CacheActivity。
一切工作正常，但之前，我点击下载按钮，当我在下载按钮会显示进度条和进度单击直到百消失，但仍然在下载是下载开始。我希望同步下载图像和进度条。
code以下。任何帮助
公共类URLImageAdapter延伸BaseAdapter {私有类图片{
字符串URL;
位图大拇指;
}私人图片[]图像;
私人语境myContext;
私人LoadThumbsTask thumbnailGen;
私有对象previousList;公共URLImageAdapter（上下文C）{
myContext = C;
thumbnailGen =新LoadThumbsTask（）; 如果（previousList！= NULL）{
照片=（图片[]）previousList;
thumbnailGen.execute（图像）;
返回;
} 照片=新的图像[imageURLs.length] 的for（int i = 0，J = imageURLs.length; I＆LT;焦耳;我++）{
图像[i] =新的图像（）;
图像[I]的.url = imageURLs [I]
} thumbnailGen.execute（图像）;}公众诠释的getCount（）{
返回images.length;
}公共对象的getItem（INT位置）{
返回图像[位置]的.url;
}众长getItemId（INT位置）{
返回的位置;
}公共对象的getData（）{
如果（thumbnailGen！= NULL
＆功放;＆安培; thumbnailGen.getStatus（）！= AsyncTask.Status.FINISHED）{
thumbnailGen.cancel（真）;
} 返回图像;
}公共查看getView（INT位置，查看convertView，父母的ViewGroup）{ ImageView的imgView; 图像缓存=图像[位置] 如果（convertView == NULL）{ imgView =新ImageView的（myContext）;
imgView.setLayoutParams（新GridView.LayoutParams（100，100））; }其他{ imgView =（ImageView的）convertView; } 如果（cached.thumb == NULL）{ imgView.setImageResource（R.drawable.ic_action_search）;
imgView.setScaleType（ScaleType.CENTER）; }其他{ imgView.setScaleType（ScaleType.FIT_CENTER）;
imgView.setImageBitmap（cached.thumb）; } 返回imgView;
}私人无效cacheUpdated（）{
this.notifyDataSetChanged（）;
}
私人位图loadThumb（字符串URL）{ 位图拇指= NULL; BitmapFactory.Options选择采用=新BitmapFactory.Options（）;
opts.inSampleSize = 4; 尝试{ URL U =新的URL（网址）;
URLConnection的C = u.openConnection（）;
c.connect（）; 的BufferedInputStream流=新的BufferedInputStream（
c.getInputStream（））; 拇指= BitmapFactory.de codeStream（流空，选择采用）;
stream.close（）; }赶上（MalformedURLException的E）{
Log.e（ERROR，恶意网址：+网址）;
}赶上（IOException异常五）{
Log.e（ERROR，发生了错误下载的形象：
+网址）;
} 返回大拇指;
}私有类LoadThumbsTask扩展的AsyncTask＆lt;图像，太虚，太虚＆GT; { @覆盖
保护无效doInBackground（图像...缓存）{ BitmapFactory.Options选择采用=新BitmapFactory.Options（）;
opts.inSampleSize = 4; 对于（图像I：缓存）{ 如果（isCancelled（））
返回null; 如果（i.thumb！= NULL）
继续; SystemClock.sleep（500）; i.thumb = loadThumb（i.url）; publishProgress（）;
} 返回null; } @覆盖
保护无效onProgressUpdate（无效...参数）{
cacheUpdated（）;
}
}私有String [] = imageURLs {
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_2851.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_2944.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_2989.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3005.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3012.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3034.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3047.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3092.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3110.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3113.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3128.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3160.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3226.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3228.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3251.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3268.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3275.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3346.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3365.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3374.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3385.jpg
http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3392.jpg};
}
CacheActivity
公共类CacheActivity延伸活动{按钮btnStartProgress;
ProgressDialog进度;
私人INT progressBarStatus = 0;
私人处理程序progressBarHandler =新的处理程序（）;私人长期档案大小= 0;@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_cache）;
GridView控件的GridView =（GridView控件）findViewById（R.id.grid_view）;
gridview.setAdapter（新URLImageAdapter（本））;
addListenerOnButton（）; }公共无效addListenerOnButton（）{ btnStartProgress =（按钮）findViewById（R.id.btnStartProgress）;
btnStartProgress.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）{ 进度=新ProgressDialog（v.getContext（））;
progressBar.setCancelable（真）;
progressBar.setMessage（文件下载...）;
progressBar.setProgressStyle（ProgressDialog.STYLE_HORIZONTAL）;
progressBar.setProgress（0）;
progressBar.setMax（100）;
progressBar.show（）; progressBarStatus = 0; 档案大小= 0; 新主题（新的Runnable接口（）{
公共无效的run（）{
而（progressBarStatus＆LT; 100）{ progressBarStatus = doInBackground（）; 尝试{
视频下载（1000）;
}赶上（InterruptedException的E）{
e.printStackTrace（）;
} progressBarHandler.post（新的Runnable（）{
公共无效的run（）{
progressBar.setProgress（progressBarStatus）;
}
}）;
} 如果（progressBarStatus＆GT; = 100）{ 尝试{
视频下载（200）;
}赶上（InterruptedException的E）{
e.printStackTrace（）;
} progressBar.dismiss（）;
}
}
}）。开始（）; } }）;}公众诠释doInBackground（）{ 而（档案大小＆LT; = 1000000）{ 档案大小++; 如果（档案大小== 100000）{
返回10;
}否则如果（档案大小== 200000）{
返回20;
}否则如果（档案大小== 300000）{
返回30;
}否则如果（档案大小== 400000）{
返回40;
}否则如果（档案大小== 500000）{
返回50;
}否则如果（档案大小== 600000）{
返回60;
}否则如果（档案大小== 700000）{
返回70;
}否则如果（档案大小== 800000）{
返回80;
}否则如果（档案大小== 900000）{
返回90;
} } 返回100;}}
解决方案在使用下载图片
公共类LoginProgress扩展的AsyncTask＆LT;对象，对象，对象＆gt; {
私人ProgressDialog对话框;
@覆盖
在preExecute保护无效（）{
this.dialog = ProgressDialog.show（ApplicationContext时请等待下，
加载.....，真正的）;
}
@覆盖
保护对象doInBackground（对象... PARAMS）{
// TODO自动生成方法存根
返回null;
}
@覆盖
保护无效onPostExecute（虚空未使用）{
//意向的下一个活动
this.dialog.dismiss（）;
} }这些类按一下按钮创建对象
LoginProgress任务=新LoginProgress（）;
task.execute（）;调用乌尔doInBackground方法在这些doinbackground梅索德
做，否则下面的两个
增量视频下载的时间（1000）;改变了Thread.sleep（4000）;
视频下载（200）;改变了Thread.sleep（450）;您设置gridview.setAdapter（新URLImageAdapter（CacheActivity.this））;
末写
在OnCreate中，删除该适配器的OnCreate，并在上点击的方法...I'm new to Android and Java. I have been working on my task i.e, Image Downloader. Where I have to download images with progress bar and display them in grid. I have created two classes 1. URLImageAdapter 2. CacheActivity. Everything works fine but download begins before I click on download button and when I click on download button the progress bar appears and progress till hundred vanishes but still downloading is on. I want to synchronize downloading images and progress bar.
Code Below. Any Help
public class URLImageAdapter extends BaseAdapter { private class Image { String url; Bitmap thumb; } private Image[] images; private Context myContext; private LoadThumbsTask thumbnailGen; private Object previousList; public URLImageAdapter(Context c) { myContext = c; thumbnailGen = new LoadThumbsTask(); if (previousList != null) { images = (Image[]) previousList; thumbnailGen.execute(images); return; } images = new Image[imageURLs.length]; for (int i = 0, j = imageURLs.length; i < j; i++) { images[i] = new Image(); images[i].url = imageURLs[i]; } thumbnailGen.execute(images); } public int getCount() { return images.length; } public Object getItem(int position) { return images[position].url; } public long getItemId(int position) { return position; } public Object getData() { if (thumbnailGen != null && thumbnailGen.getStatus() != AsyncTask.Status.FINISHED) { thumbnailGen.cancel(true); } return images; } public View getView(int position, View convertView, ViewGroup parent) { ImageView imgView; Image cached = images[position]; if (convertView == null) { imgView = new ImageView(myContext); imgView.setLayoutParams(new GridView.LayoutParams(100, 100)); } else { imgView = (ImageView) convertView; } if (cached.thumb == null) { imgView.setImageResource(R.drawable.ic_action_search); imgView.setScaleType(ScaleType.CENTER); } else { imgView.setScaleType(ScaleType.FIT_CENTER); imgView.setImageBitmap(cached.thumb); } return imgView; } private void cacheUpdated() { this.notifyDataSetChanged(); } private Bitmap loadThumb(String url) { Bitmap thumb = null; BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inSampleSize = 4; try { URL u = new URL(url); URLConnection c = u.openConnection(); c.connect(); BufferedInputStream stream = new BufferedInputStream( c.getInputStream()); thumb = BitmapFactory.decodeStream(stream, null, opts); stream.close(); } catch (MalformedURLException e) { Log.e("ERROR", "malformed url: " + url); } catch (IOException e) { Log.e("ERROR", "An error has occurred downloading the image: " + url); } return thumb; } private class LoadThumbsTask extends AsyncTask<Image, Void, Void> { @Override protected Void doInBackground(Image... cache) { BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inSampleSize = 4; for (Image i : cache) { if (isCancelled()) return null; if (i.thumb != null) continue; SystemClock.sleep(500); i.thumb = loadThumb(i.url); publishProgress(); } return null; } @Override protected void onProgressUpdate(Void... param) { cacheUpdated(); } } private String[] imageURLs = { "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_2851.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_2944.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_2989.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3005.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3012.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3034.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3047.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3092.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3110.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3113.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3128.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3160.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3226.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3228.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3251.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3268.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3275.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3346.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3365.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3374.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3385.jpg", "http://cdn.cs76.net/2011/spring/lectures/6/imgs/img_3392.jpg", }; }
CacheActivity
public class CacheActivity extends Activity { Button btnStartProgress; ProgressDialog progressBar; private int progressBarStatus = 0; private Handler progressBarHandler = new Handler(); private long fileSize = 0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_cache); GridView gridview = (GridView) findViewById(R.id.grid_view); gridview.setAdapter(new URLImageAdapter(this)); addListenerOnButton(); } public void addListenerOnButton() { btnStartProgress = (Button) findViewById(R.id.btnStartProgress); btnStartProgress.setOnClickListener(new OnClickListener() { public void onClick(View v) { progressBar = new ProgressDialog(v.getContext()); progressBar.setCancelable(true); progressBar.setMessage("File downloading ..."); progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); progressBar.setProgress(0); progressBar.setMax(100); progressBar.show(); progressBarStatus = 0; fileSize = 0; new Thread(new Runnable() { public void run() { while (progressBarStatus < 100) { progressBarStatus = doInBackground(); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } progressBarHandler.post(new Runnable() { public void run() { progressBar.setProgress(progressBarStatus); } }); } if (progressBarStatus >= 100) { try { Thread.sleep(200); } catch (InterruptedException e) { e.printStackTrace(); } progressBar.dismiss(); } } }).start(); } }); } public int doInBackground() { while (fileSize <= 1000000) { fileSize++; if (fileSize == 100000) { return 10; } else if (fileSize == 200000) { return 20; } else if (fileSize == 300000) { return 30; }else if (fileSize == 400000) { return 40; }else if (fileSize == 500000) { return 50; }else if (fileSize == 600000) { return 60; }else if (fileSize == 700000) { return 70; }else if (fileSize == 800000) { return 80; }else if (fileSize == 900000) { return 90; } } return 100; } }
解决方案download image in using
public class LoginProgress extends AsyncTask<Object, Object, Object> { private ProgressDialog dialog; @Override protected void onPreExecute() { this.dialog = ProgressDialog.show(applicationContext, "Please wait down", "Loading .....", true); } @Override protected Object doInBackground(Object... params) { // TODO Auto-generated method stub return null; } @Override protected void onPostExecute(Void unused) { //Intent for next activity this.dialog.dismiss(); } }create object for these class in button click
LoginProgress task = new LoginProgress(); task.execute();call ur doinbackground method in these doinbackground methode
otherwise do following two
increment time of Thread.sleep(1000); change to Thread.sleep(4000); Thread.sleep(200); change to Thread.sleep(450);
you set gridview.setAdapter(new URLImageAdapter(CacheActivity.this)); in oncreate , remove this adapter in oncreate and write it in end of on click method...
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