应用名称为：ThreadingNoThreading
有缺陷的类名：threading.java
我的是一个简单的程序。这个特殊的类有两个按钮。一到吐司和另一个从互联网下载图像并在图像视图中设置它。使用AsyncTask进行线程化。
当我在MOTO E上运行程序时，它会抛出一个运行时异常，声明它需要INTERNET权限，我已经提供了。似乎我错过了成功运行此应用程序的一部分难题。
注意：通过连接到WIFI的笔记本电脑调试此应用程序，因此我在笔记本电脑上禁用了我的LAN卡。 （正如我所读，Android系统将LAN CARD视为主要连接）
如果我遗失任何东西，请帮助我理解。
以下是我的课程： 的 Threading.java
package android.dreamtechprojects.threadingnothreading;
import android.annotation.TargetApi;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
/**
* Created by Sony on 18-08-2015.
*/
public class Threading extends Activity {
Button threadingToastButton, threadingImageViewButton;
ImageView threadingImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_for_threading);
threadingImageView = (ImageView) findViewById(R.id.threadingImageView);
threadingImageViewButton = (Button) findViewById(R.id.threadingImageViewButton);
threadingToastButton = (Button) findViewById(R.id.threadingToastButton);
// Start the Async Task to download the image, when this button is pressed.
threadingImageViewButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new DownloadImage().execute("http://img3.wikia.nocookie.net/__cb20120826123355/vssaxtonhale/images/c/c2/Troll-face.png");
}
});
threadingToastButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(),"Toast received", Toast.LENGTH_LONG).show();
}
});
}
// Set a drawable to the image view
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
private void setImage(Drawable drawable) {
threadingImageView.setBackground(drawable);
}
// Inner class to download the image
public class DownloadImage extends AsyncTask<String, Integer, Drawable> {
@Override
protected Drawable doInBackground(String... strings) {
return downloadImage(strings[0]);
}
@Override
protected void onPostExecute(Drawable drawable) {
setImage(drawable);
}
// Logic to download the image
private Drawable downloadImage(String _url) {
// Prepare to download the imate
URL url;
InputStream inputStream;
BufferedInputStream bufferedInputStream;
try {
url = new URL(_url);
inputStream = url.openStream();
// Read the input stream
bufferedInputStream = new BufferedInputStream(inputStream);
// Convert the input stream into a bitmap
Bitmap bitmap = BitmapFactory.decodeStream(bufferedInputStream);
//Close the streams
if (inputStream != null) {
inputStream.close();
}
if (bufferedInputStream != null) {
bufferedInputStream.close();
}
return new BitmapDrawable(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
}
以下是我的 AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="android.dreamtechprojects.threadingnothreading">
<uses-permission android:name="ANDROID.PERMISSION.INTERNET" />
<uses-permission android:name="ANDROID.PERMISSION.ACCESS_WIFI_STATE" />
<uses-permission android:name="ANDROID.PERMISSION.CHANGE_WIFI_STATE" />
<uses-permission android:name="ANDROID.PERMISSION.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="ANDROID.PERMISSION.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity android:name=".StartActivity">
<intent-filter>
<action android:name="ANDROID.INTENT.ACTION.MAIN" />
<category android:name="ANDROID.INTENT.CATEGORY.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Threading">
</activity>
<activity android:name=".NoThreading">
</activity>
</application>
</manifest>
以下是我的 layout_for_threading.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="300dp"
android:id="@+id/threadingImageView"
android:contentDescription="@string/ImageViewContentDescriptior"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/threadingImageViewButton"
android:text="@string/ImageViewButton"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/threadingToastButton"
android:text="@string/ToastButton"/>
</LinearLayout>
以下是运行时异常
08-19 00:00:42.134 14371-14563/android.dreamtechprojects.threadingnothreading E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: android.dreamtechprojects.threadingnothreading, PID: 14371
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:304)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
at java.net.InetAddress.lookupHostByName(InetAddress.java:451)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
at java.net.InetAddress.getAllByName(InetAddress.java:215)
at com.android.okhttp.HostResolver$1.getAllByName(HostResolver.java:29)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:232)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:124)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:272)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:332)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:199)
at java.net.URL.openStream(URL.java:470)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.downloadImage(Threading.java:92)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.doInBackground(Threading.java:73)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.doInBackground(Threading.java:69)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
at libcore.io.Posix.android_getaddrinfo(Native Method)
at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
at java.net.InetAddress.lookupHostByName(InetAddress.java:438)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
at java.net.InetAddress.getAllByName(InetAddress.java:215)
at com.android.okhttp.HostResolver$1.getAllByName(HostResolver.java:29)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:232)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:124)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:272)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:332)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:199)
at java.net.URL.openStream(URL.java:470)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.downloadImage(Threading.java:92)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.doInBackground(Threading.java:73)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.doInBackground(Threading.java:69)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: android.system.ErrnoException: android_getaddrinfo failed: EACCES (Permission denied)
at libcore.io.Posix.android_getaddrinfo(Native Method)
at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
at java.net.InetAddress.lookupHostByName(InetAddress.java:438)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
at java.net.InetAddress.getAllByName(InetAddress.java:215)
at com.android.okhttp.HostResolver$1.getAllByName(HostResolver.java:29)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:232)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:124)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:272)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:332)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:199)
at java.net.URL.openStream(URL.java:470)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.downloadImage(Threading.java:92)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.doInBackground(Threading.java:73)
at android.dreamtechprojects.threadingnothreading.Threading$DownloadImage.doInBackground(Threading.java:69)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
答案 0 :(得分：6)
将 include/configs/espresso.h
替换为所有ANDROID.PERMISSION元素中的android.permission。只有最后一段（例如<uses-permission>）全部上限。
最有可能的是，由于this Android Studio bug，INTERNET元素被错误地大写，这应该在Android Studio 1.4中修复（当前只发布在金丝雀频道中）。