我试图下载和显示的URL我的ImageView一个形象,我会得到dyncamically。我已经试过这样
网址URL =新的URL(parsedWeatherResponse.getWeatherIconUrl());
BMP位= BitmapFactory.de codeStream(url.openConnection()的getInputStream());
weather_image.setImageBitmap(BMP);
但它显示出异常是
12月10日至四日:22:40.221:E / AndroidRuntime(15097):致命异常:主要
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):java.lang.RuntimeException的:无法启动的活动ComponentInfo {com.example.itintestapp / com.example.itintestapp.MainActivity}:android.os.NetworkOnMainThreadException
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2211)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.ActivityThread.access $ 600(ActivityThread.java:149)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1300)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.os.Handler.dispatchMessage(Handler.java:99)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.os.Looper.loop(Looper.java:153)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.ActivityThread.main(ActivityThread.java:4987)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在java.lang.reflect.Method.invokeNative(本机方法)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在java.lang.reflect.Method.invoke(Method.java:511)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:821)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在dalvik.system.NativeStart.main(本机方法)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):由:android.os.NetworkOnMainThreadException
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1125)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在java.net.InetAddress.lookupHostByName(InetAddress.java:385)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在java.net.InetAddress.getAllByName(InetAddress.java:214)
。12月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpConnection< INIT>(HttpConnection.java:70)
。12月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpConnection< INIT>(HttpConnection.java:50)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpConnection $ Address.connect(HttpConnection.java:340)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:292)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:185)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在com.example.itintestapp.MainActivity.setSectorData(MainActivity.java:64)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在com.example.itintestapp.MainActivity.onCreate(MainActivity.java:40)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.Activity.performCreate(Activity.java:5020)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
十二月10号至4日:22:40.221:E / AndroidRuntime(15097):11 ...更多
请帮助我,我怎么couuld做到这一点。我已经从一个URL显示图像
我已经试过这样
类DownloadImageTask扩展的AsyncTask<字符串,太虚,位图> {
ImageView的bmImage;
公共DownloadImageTask(ImageView的bmImage){
this.bmImage = bmImage;
}
受保护的位图doInBackground(字符串...网址){
串urldisplay =网址[0];
位图mIcon11 = NULL;
尝试 {
InputStream的时间=新的java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.de codeStream(中);
}赶上(例外五){
Log.e(错误,e.getMessage());
e.printStackTrace();
}
返回mIcon11;
}
保护无效onPostExecute(位图的结果){
bmImage.setImageBitmap(结果);
}
}
呼叫
新DownloadImageTask((ImageView的)findViewById(R.id.weather_image))
.execute(parsedWeatherResponse.getWeatherIconUrl());
闻听此事的除了
12月10日至四日:29:14.298:E / AndroidRuntime(15813):致命异常:主要
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):显示java.lang.NullPointerException
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在com.example.itintestapp.DownloadImageTask.onPostExecute(DownloadImageTask.java:32)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在com.example.itintestapp.DownloadImageTask.onPostExecute(DownloadImageTask.java:1)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在android.os.AsyncTask.finish(AsyncTask.java:631)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在android.os.AsyncTask.access $ 600(AsyncTask.java:177)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在android.os.AsyncTask $ InternalHandler.handleMessage(AsyncTask.java:644)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在android.os.Handler.dispatchMessage(Handler.java:99)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在android.os.Looper.loop(Looper.java:153)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在android.app.ActivityThread.main(ActivityThread.java:4987)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在java.lang.reflect.Method.invokeNative(本机方法)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在java.lang.reflect.Method.invoke(Method.java:511)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:821)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
十二月10号至4日:29:14.298:E / AndroidRuntime(15813):在dalvik.system.NativeStart.main(本机方法)
解决方案
您正在运行相关的操作UI线程上的网络。所以,你得到 NetworkOnMainThreadException
。
BMP位= BitmapFactory.de codeStream(url.openConnection()的getInputStream());
的http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html
您应该使用发
或的AsyncTask
。
http://developer.android.com/reference/android/os/ AsyncTask.html 。
检查文档有一个例子。
例如:
公共类MainActivity延伸活动{
ImageView的IV;
ProgressDialog PD;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
PD =新ProgressDialog(本);
pd.setMessage(下载图像);
IV =(ImageView的)findViewById(R.id.imageView1);
按钮B1 =(按钮)findViewById(R.id.button1);
b1.setOnClickListener(新OnClickListener()
{
@覆盖
公共无效的onClick(视图v){
// TODO自动生成方法存根
新DownloadImageTask(iv).execute("https://m.xsw88.com/allimgs/daicuo/20230905/785.png");
}
});
}
类DownloadImageTask扩展的AsyncTask<字符串,太虚,位图> {
ImageView的bmImage;
公共DownloadImageTask(ImageView的bmImage){
this.bmImage = bmImage;
}
@覆盖
在preExecute保护无效(){
// TODO自动生成方法存根
super.on preExecute();
pd.show();
}
受保护的位图doInBackground(字符串...网址){
串urldisplay =网址[0];
位图mIcon11 = NULL;
尝试 {
InputStream的时间=新的java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.de codeStream(中);
}赶上(例外五){
Log.e(错误,e.getMessage());
e.printStackTrace();
}
返回mIcon11;
}
@覆盖
保护无效onPostExecute(位图的结果){
super.onPostExecute(结果);
pd.dismiss();
bmImage.setImageBitmap(结果);
}
}
}
activity_main.xml
< RelativeLayout的的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools
的xmlns:android1 =http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent
机器人:layout_height =match_parent>
< ImageView的
机器人:ID =@ + ID / imageView1
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_alignParentTop =真
机器人:layout_centerHorizontal =真
机器人:layout_marginTop =171dp
机器人:SRC =@可绘制/ ic_launcher/>
<按钮
机器人:ID =@ + ID /按钮1
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_alignParentBottom =真
机器人:layout_centerHorizontal =真
机器人:layout_marginBottom =78dp
机器人:文本=按钮/>
< / RelativeLayout的>
快
I am trying to download and show a image in my imageview from URL that i will get dyncamically .I have tried this way
URL url = new URL(parsedWeatherResponse.getWeatherIconUrl());
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
weather_image.setImageBitmap(bmp);
But it showing exception that is
10-04 12:22:40.221: E/AndroidRuntime(15097): FATAL EXCEPTION: main
10-04 12:22:40.221: E/AndroidRuntime(15097): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.itintestapp/com.example.itintestapp.MainActivity}: android.os.NetworkOnMainThreadException
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2211)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.ActivityThread.access$600(ActivityThread.java:149)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1300)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.os.Handler.dispatchMessage(Handler.java:99)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.os.Looper.loop(Looper.java:153)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.ActivityThread.main(ActivityThread.java:4987)
10-04 12:22:40.221: E/AndroidRuntime(15097): at java.lang.reflect.Method.invokeNative(Native Method)
10-04 12:22:40.221: E/AndroidRuntime(15097): at java.lang.reflect.Method.invoke(Method.java:511)
10-04 12:22:40.221: E/AndroidRuntime(15097): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
10-04 12:22:40.221: E/AndroidRuntime(15097): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
10-04 12:22:40.221: E/AndroidRuntime(15097): at dalvik.system.NativeStart.main(Native Method)
10-04 12:22:40.221: E/AndroidRuntime(15097): Caused by: android.os.NetworkOnMainThreadException
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1125)
10-04 12:22:40.221: E/AndroidRuntime(15097): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
10-04 12:22:40.221: E/AndroidRuntime(15097): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
10-04 12:22:40.221: E/AndroidRuntime(15097): at java.net.InetAddress.getAllByName(InetAddress.java:214)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:292)
10-04 12:22:40.221: E/AndroidRuntime(15097): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:185)
10-04 12:22:40.221: E/AndroidRuntime(15097): at com.example.itintestapp.MainActivity.setSectorData(MainActivity.java:64)
10-04 12:22:40.221: E/AndroidRuntime(15097): at com.example.itintestapp.MainActivity.onCreate(MainActivity.java:40)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.Activity.performCreate(Activity.java:5020)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
10-04 12:22:40.221: E/AndroidRuntime(15097): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-04 12:22:40.221: E/AndroidRuntime(15097): ... 11 more
Please help me how couuld i do this .I have show a image from a URL
I have tried this way
class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
Calling
new DownloadImageTask((ImageView) findViewById(R.id.weather_image))
.execute(parsedWeatherResponse.getWeatherIconUrl());
Getting this exception
10-04 12:29:14.298: E/AndroidRuntime(15813): FATAL EXCEPTION: main
10-04 12:29:14.298: E/AndroidRuntime(15813): java.lang.NullPointerException
10-04 12:29:14.298: E/AndroidRuntime(15813): at com.example.itintestapp.DownloadImageTask.onPostExecute(DownloadImageTask.java:32)
10-04 12:29:14.298: E/AndroidRuntime(15813): at com.example.itintestapp.DownloadImageTask.onPostExecute(DownloadImageTask.java:1)
10-04 12:29:14.298: E/AndroidRuntime(15813): at android.os.AsyncTask.finish(AsyncTask.java:631)
10-04 12:29:14.298: E/AndroidRuntime(15813): at android.os.AsyncTask.access$600(AsyncTask.java:177)
10-04 12:29:14.298: E/AndroidRuntime(15813): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
10-04 12:29:14.298: E/AndroidRuntime(15813): at android.os.Handler.dispatchMessage(Handler.java:99)
10-04 12:29:14.298: E/AndroidRuntime(15813): at android.os.Looper.loop(Looper.java:153)
10-04 12:29:14.298: E/AndroidRuntime(15813): at android.app.ActivityThread.main(ActivityThread.java:4987)
10-04 12:29:14.298: E/AndroidRuntime(15813): at java.lang.reflect.Method.invokeNative(Native Method)
10-04 12:29:14.298: E/AndroidRuntime(15813): at java.lang.reflect.Method.invoke(Method.java:511)
10-04 12:29:14.298: E/AndroidRuntime(15813): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
10-04 12:29:14.298: E/AndroidRuntime(15813): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
10-04 12:29:14.298: E/AndroidRuntime(15813): at dalvik.system.NativeStart.main(Native Method)
解决方案
You are running the network related operation on the ui thread. So, you get NetworkOnMainThreadException
.
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html
You should use a Thread
or Asynctask
.
http://developer.android.com/reference/android/os/AsyncTask.html.
Check the docs there is an example.
Example:
public class MainActivity extends Activity {
ImageView iv ;
ProgressDialog pd;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pd = new ProgressDialog(this);
pd.setMessage("Downloading Image");
iv = (ImageView) findViewById(R.id.imageView1);
Button b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new DownloadImageTask(iv).execute("https://m.xsw88.com/allimgs/daicuo/20230905/785.png");
}
});
}
class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pd.show();
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
pd.dismiss();
bmImage.setImageBitmap(result);
}
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android1="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="171dp"
android:src="@drawable/ic_launcher" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="78dp"
android:text="Button" />
</RelativeLayout>
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