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};
}
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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