我使用url的多种外部imageview方式。但不幸的是，所有的活动都停止了。你知道那就是为什么吗？我在清单文件中有互联网perimision。但我无法解决它。有谁可以帮助我。 ？
我在链接中使用这种方式。但没有在我的项目中工作。 how to display external image in android?
public class MainActivity extends Activity{
ImageView imgView;
EditText inputUrl;
OnClickListener getImageBtnOnClick = new OnClickListener() {
public void onClick(View view) {
Context context = view.getContext();
Editable ed = inputUrl.getText();
Drawable image = ImageOperations(context,"http://www.cssnz.org/flower.jpg" ,"image.jpg");
imgView = (ImageView)findViewById(R.id.i1);
imgView.setImageDrawable(image);
}
};
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_main);
inputUrl = ((EditText)findViewById(R.id.imageURL));
inputUrl.setSingleLine();
inputUrl.setTextSize(11);
Button getImageButton = (Button)findViewById(R.id.getImageButton);
getImageButton.setOnClickListener(getImageBtnOnClick);
}
private Drawable ImageOperations(Context ctx, String url, String saveFilename) {
try {
InputStream is = (InputStream) this.fetch(url);
Drawable d = Drawable.createFromStream(is, "src");
return d;
} catch (MalformedURLException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
public Object fetch(String address) throws MalformedURLException,IOException {
URL url = new URL(address);
Object content = url.getContent();
return content;
}
}
xml file
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/getImageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="39dp"
android:layout_marginTop="22dp" />
<ImageView
android:id="@+id/i1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="106dp"
android:src="@drawable/ic_action_search" />
<EditText
android:id="@+id/imageURL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10" >
<requestFocus />
</EditText>
</LinearLayout>
android.manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.externalimageview"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
log cat
09-14 19:56:31.409: W/dalvikvm(1097): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
09-14 19:56:31.459: E/AndroidRuntime(1097): FATAL EXCEPTION: main
09-14 19:56:31.459: E/AndroidRuntime(1097): android.os.NetworkOnMainThreadException
09-14 19:56:31.459: E/AndroidRuntime(1097): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
09-14 19:56:31.459: E/AndroidRuntime(1097): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
09-14 19:56:31.459: E/AndroidRuntime(1097): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
09-14 19:56:31.459: E/AndroidRuntime(1097): at java.net.InetAddress.getAllByName(InetAddress.java:220)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:71)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
09-14 19:56:31.459: E/AndroidRuntime(1097): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
09-14 19:56:31.459: E/AndroidRuntime(1097): at java.net.URLConnection.getContent(URLConnection.java:194)
09-14 19:56:31.459: E/AndroidRuntime(1097): at java.net.URL.getContent(URL.java:447)
09-14 19:56:31.459: E/AndroidRuntime(1097): at com.example.externalimageview.MainActivity.fetch(MainActivity.java:61)
09-14 19:56:31.459: E/AndroidRuntime(1097): at com.example.externalimageview.MainActivity.ImageOperations(MainActivity.java:47)
09-14 19:56:31.459: E/AndroidRuntime(1097): at com.example.externalimageview.MainActivity.access$0(MainActivity.java:45)
09-14 19:56:31.459: E/AndroidRuntime(1097): at com.example.externalimageview.MainActivity$1.onClick(MainActivity.java:27)
09-14 19:56:31.459: E/AndroidRuntime(1097): at android.view.View.performClick(View.java:3511)
09-14 19:56:31.459: E/AndroidRuntime(1097): at android.view.View$PerformClick.run(View.java:14105)
09-14 19:56:31.459: E/AndroidRuntime(1097): at android.os.Handler.handleCallback(Handler.java:605)
09-14 19:56:31.459: E/AndroidRuntime(1097): at android.os.Handler.dispatchMessage(Handler.java:92)
09-14 19:56:31.459: E/AndroidRuntime(1097): at android.os.Looper.loop(Looper.java:137)
09-14 19:56:31.459: E/AndroidRuntime(1097): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-14 19:56:31.459: E/AndroidRuntime(1097): at java.lang.reflect.Method.invokeNative(Native Method)
09-14 19:56:31.459: E/AndroidRuntime(1097): at java.lang.reflect.Method.invoke(Method.java:511)
09-14 19:56:31.459: E/AndroidRuntime(1097): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-14 19:56:31.459: E/AndroidRuntime(1097): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-14 19:56:31.459: E/AndroidRuntime(1097): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
您正面临android.os.NetworkOnMainThreadException。新引入此异常是为了限制您的应用程序从主UI线程访问网络。
这主要用于避免您的应用停止响应用户交互。当从主线程访问网络时，它实际上阻止UI响应，直到方法完成执行。所以为了避免这个android抛出这个异常。
所以你可能需要做的是，使用Worker Thread或AsyncTask。
答案 1 :(得分：0)
请使用Async Task下载图片，或者您可以使用以下代码解决此问题，在setContentView(R.layout.activity_main);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}