Android的下载图像从URL,并显示在ImageView的 [英] Android Download Image From URL and show in Imageview
本文介绍了Android的下载图像从URL,并显示在ImageView的的处理方法,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
我想告诉我下载的图像在我的ImageView。我收到错误类型不匹配:不能从ImageView的转换为位图。它说我不能在ImageView的显示位图图像。谁能告诉我一个方法来完成呢?
公共类SingleImageViewActivity扩展SherlockActivity {
// XML节点键
静态最后弦乐KEY_TITLE =称号;
静态最后弦乐KEY_ARTIST =艺术家;
静态最后弦乐KEY_BIG_URL =big_url;
私人ProgressDialog pDialog;
字符串称号;
字符串的艺术家;
字符串big_image_url;
ImageView的观点;
URL网址;
位图bmImg = NULL;
ShareActionProvider mShareActionProvider;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.single_view_item);
getSupportActionBar()setDisplayHomeAsUpEnabled(真)。
新loadSingleView()执行()。
}
公共类loadSingleView扩展的AsyncTask<字符串,字符串,字符串> {
@覆盖
在preExecute保护无效(){
super.on preExecute();
pDialog =新ProgressDialog(SingleImageViewActivity.this);
pDialog.setTitle(连接到服务器);
pDialog.setMessage(这个过程可能需要几秒钟到几分钟,这取决于你的互联网连接速度。);
pDialog.setIndeterminate(假);
pDialog.setCancelable(假);
pDialog.show();
}
@覆盖
保护字符串doInBackground(字符串参数... args){
//从后台线程更新UI
尝试 {
意图= getIntent();
big_image_url = in.getStringExtra(KEY_BIG_URL);
标题= in.getStringExtra(KEY_TITLE);
艺术家= in.getStringExtra(KEY_ARTIST);
URL =新的URL(big_image_url);
HttpURLConnection的康恩=(HttpURLConnection类)url.openConnection();
conn.setDoInput(真正的);
conn.connect();
InputStream的是= conn.getInputStream();
bmImg = BitmapFactory.de codeStream(是);
}
赶上(IOException异常E)
{
e.printStackTrace();
}
返回null;
}
@覆盖
保护无效onPostExecute(字符串参数){
让所有的产品之后//关闭该对话框
TextView的lblName =(TextView中)findViewById(R.id.name_title);
TextView的lblCost =(TextView中)findViewById(R.id.name_artist);
lblName.setText(职称);
lblCost.setText(艺术家);
动作条AB = getSupportActionBar();
ab.setTitle(职称);
ab.setSubtitle(艺术家);
鉴于=(ImageView的)findViewById(R.id.single_image);
view.setImageBitmap(bmImg);
pDialog.dismiss();
}
}
logcat的:
08-28 22:19:44.225:E / AndroidRuntime(20825):致命异常:AsyncTask的#3
08-28 22:19:44.225:E / AndroidRuntime(20825):java.lang.RuntimeException的:执行doInBackground时出错()
08-28 22:19:44.225:E / AndroidRuntime(20825):在android.os.AsyncTask $ 3.done(AsyncTask.java:278)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.util.concurrent.FutureTask中$ Sync.innerSetException(FutureTask.java:273)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.util.concurrent.FutureTask中$ Sync.innerRun(FutureTask.java:307)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run(ThreadPoolExecutor.java:569)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.lang.Thread.run(Thread.java:856)
08-28 22:19:44.225:E / AndroidRuntime(20825):由:显示java.lang.NullPointerException
08-28 22:19:44.225:E / AndroidRuntime(20825):在com.example.androidhive.SingleImageViewActivity$loadSingleView.doInBackground(SingleImageViewActivity.java:91)
08-28 22:19:44.225:E / AndroidRuntime(20825):在com.example.androidhive.SingleImageViewActivity$loadSingleView.doInBackground(SingleImageViewActivity.java:1)
08-28 22:19:44.225:E / AndroidRuntime(20825):在android.os.AsyncTask $ 2.call(AsyncTask.java:264)
08-28 22:19:44.225:E / AndroidRuntime(20825):在java.util.concurrent.FutureTask中$ Sync.innerRun(FutureTask.java:305)
08-28 22:19:44.225:E / AndroidRuntime(20825):4 ...更多
08-28 22:19:49.631:E /窗口管理器(20825):活动com.example.androidhive.SingleImageViewActivity渗漏最初此处添加窗口com.android.internal.policy.impl.PhoneWindow$DecorView@416c0328
08-28 22:19:49.631:E /窗口管理器(20825):android.view.WindowLeaked:活动com.example.androidhive.SingleImageViewActivity渗漏窗口com.android.internal.policy.impl.PhoneWindow$DecorView@416c0328这是原本在这里添加
。08-28 22:19:49.631:E /窗口管理器(20825):在android.view.ViewRootImpl< INIT>(ViewRootImpl.java:428)
08-28 22:19:49.631:E /窗口管理器(20825):在android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
08-28 22:19:49.631:E /窗口管理器(20825):在android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
08-28 22:19:49.631:E /窗口管理器(20825):在android.view.WindowManagerImpl $ CompatModeWrapper.addView(WindowManagerImpl.java:140)
08-28 22:19:49.631:E /窗口管理器(20825):在android.view.Window $ LocalWindowManager.addView(Window.java:537)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.Dialog.show(Dialog.java:278)
08-28 22:19:49.631:E /窗口管理器(20825):在com.example.androidhive.SingleImageViewActivity$loadSingleView.on$p$pExecute(SingleImageViewActivity.java:72)
08-28 22:19:49.631:E /窗口管理器(20825):在android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561)
08-28 22:19:49.631:E /窗口管理器(20825):在android.os.AsyncTask.execute(AsyncTask.java:511)
08-28 22:19:49.631:E /窗口管理器(20825):在com.example.androidhive.SingleImageViewActivity.onCreate(SingleImageViewActivity.java:57)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.Activity.performCreate(Activity.java:4465)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.ActivityThread.access $ 600(ActivityThread.java:127)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1161)
08-28 22:19:49.631:E /窗口管理器(20825):在android.os.Handler.dispatchMessage(Handler.java:99)
08-28 22:19:49.631:E /窗口管理器(20825):在android.os.Looper.loop(Looper.java:137)
08-28 22:19:49.631:E /窗口管理器(20825):在android.app.ActivityThread.main(ActivityThread.java:4512)
08-28 22:19:49.631:E /窗口管理器(20825):在java.lang.reflect.Method.invokeNative(本机方法)
08-28 22:19:49.631:E /窗口管理器(20825):在java.lang.reflect.Method.invoke(Method.java:511)
08-28 22:19:49.631:E /窗口管理器(20825):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:982)
08-28 22:19:49.631:E /窗口管理器(20825):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
08-28 22:19:49.631:E /窗口管理器(20825):在dalvik.system.NativeStart.main(本机方法)
解决方案
您宣布的ImageView为
ImageView的观点;
您必须在ImageView的设置图像。 它应该是这样的。
查看=(ImageView的)findViewById(R.id.single_image);
view.setImageBitmap(bmImg);
I want to show my downloaded image in my Imageview. I'm getting error " Type mismatch: cannot convert from ImageView to Bitmap " . Its saying I cannot show Bitmap images in imageview. Can anyone show me a way to accomplish it?
public class SingleImageViewActivity extends SherlockActivity {
// XML node keys
static final String KEY_TITLE = "title";
static final String KEY_ARTIST = "artist";
static final String KEY_BIG_URL = "big_url";
private ProgressDialog pDialog;
String title;
String artist;
String big_image_url;
ImageView view;
URL url;
Bitmap bmImg = null;
ShareActionProvider mShareActionProvider;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.single_view_item);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
new loadSingleView().execute();
}
public class loadSingleView extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(SingleImageViewActivity.this);
pDialog.setTitle("Connect to Server");
pDialog.setMessage("This process can take a few seconds to a few minutes, depending on your Internet Connection Speed.");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// updating UI from Background Thread
try {
Intent in = getIntent();
big_image_url = in.getStringExtra(KEY_BIG_URL);
title = in.getStringExtra(KEY_TITLE);
artist = in.getStringExtra(KEY_ARTIST);
url = new URL(big_image_url);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bmImg = BitmapFactory.decodeStream(is);
}
catch (IOException e)
{
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String args) {
// dismiss the dialog after getting all products
TextView lblName = (TextView) findViewById(R.id.name_title);
TextView lblCost = (TextView) findViewById(R.id.name_artist);
lblName.setText(title);
lblCost.setText(artist);
ActionBar ab = getSupportActionBar();
ab.setTitle(title);
ab.setSubtitle(artist);
view = (ImageView) findViewById(R.id.single_image);
view.setImageBitmap(bmImg);
pDialog.dismiss();
}
}
Logcat :
08-28 22:19:44.225: E/AndroidRuntime(20825): FATAL EXCEPTION: AsyncTask #3
08-28 22:19:44.225: E/AndroidRuntime(20825): java.lang.RuntimeException: An error occured while executing doInBackground()
08-28 22:19:44.225: E/AndroidRuntime(20825): at android.os.AsyncTask$3.done(AsyncTask.java:278)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.lang.Thread.run(Thread.java:856)
08-28 22:19:44.225: E/AndroidRuntime(20825): Caused by: java.lang.NullPointerException
08-28 22:19:44.225: E/AndroidRuntime(20825): at com.example.androidhive.SingleImageViewActivity$loadSingleView.doInBackground(SingleImageViewActivity.java:91)
08-28 22:19:44.225: E/AndroidRuntime(20825): at com.example.androidhive.SingleImageViewActivity$loadSingleView.doInBackground(SingleImageViewActivity.java:1)
08-28 22:19:44.225: E/AndroidRuntime(20825): at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-28 22:19:44.225: E/AndroidRuntime(20825): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-28 22:19:44.225: E/AndroidRuntime(20825): ... 4 more
08-28 22:19:49.631: E/WindowManager(20825): Activity com.example.androidhive.SingleImageViewActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@416c0328 that was originally added here
08-28 22:19:49.631: E/WindowManager(20825): android.view.WindowLeaked: Activity com.example.androidhive.SingleImageViewActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@416c0328 that was originally added here
08-28 22:19:49.631: E/WindowManager(20825): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:428)
08-28 22:19:49.631: E/WindowManager(20825): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
08-28 22:19:49.631: E/WindowManager(20825): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
08-28 22:19:49.631: E/WindowManager(20825): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
08-28 22:19:49.631: E/WindowManager(20825): at android.view.Window$LocalWindowManager.addView(Window.java:537)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.Dialog.show(Dialog.java:278)
08-28 22:19:49.631: E/WindowManager(20825): at com.example.androidhive.SingleImageViewActivity$loadSingleView.onPreExecute(SingleImageViewActivity.java:72)
08-28 22:19:49.631: E/WindowManager(20825): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561)
08-28 22:19:49.631: E/WindowManager(20825): at android.os.AsyncTask.execute(AsyncTask.java:511)
08-28 22:19:49.631: E/WindowManager(20825): at com.example.androidhive.SingleImageViewActivity.onCreate(SingleImageViewActivity.java:57)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.Activity.performCreate(Activity.java:4465)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.ActivityThread.access$600(ActivityThread.java:127)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
08-28 22:19:49.631: E/WindowManager(20825): at android.os.Handler.dispatchMessage(Handler.java:99)
08-28 22:19:49.631: E/WindowManager(20825): at android.os.Looper.loop(Looper.java:137)
08-28 22:19:49.631: E/WindowManager(20825): at android.app.ActivityThread.main(ActivityThread.java:4512)
08-28 22:19:49.631: E/WindowManager(20825): at java.lang.reflect.Method.invokeNative(Native Method)
08-28 22:19:49.631: E/WindowManager(20825): at java.lang.reflect.Method.invoke(Method.java:511)
08-28 22:19:49.631: E/WindowManager(20825): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
08-28 22:19:49.631: E/WindowManager(20825): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
08-28 22:19:49.631: E/WindowManager(20825): at dalvik.system.NativeStart.main(Native Method)
解决方案
You declared ImageView as
ImageView view;
You have to set Image on ImageView. It should be like this
view = (ImageView) findViewById(R.id.single_image);
view.setImageBitmap(bmImg);
这篇关于Android的下载图像从URL,并显示在ImageView的的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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