java.net.UnknownHostException错误，但网站

Question

我有两个Android应用程序..第一个包含带有按钮和图像视图的编辑文本...单击按钮将调用与网站的连接并将图像下载到图像视图...这个应用程序很好 这是第一个应用程序的xml：

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="arb.myapplication.MainActivity">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:srcCompat="@mipmap/ic_launcher"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="131dp"
        android:id="@+id/imageView"
        android:visibility="invisible"/>

    <Button
        android:text="Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginRight="39dp"
        android:layout_marginEnd="39dp"
        android:layout_marginTop="11dp"
        android:id="@+id/button3"
        android:elevation="0dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:ems="10"
        android:layout_below="@+id/button3"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="26dp"
        android:layout_marginStart="26dp"
        android:layout_marginTop="47dp"
        android:id="@+id/editText"
        android:background="@android:color/background_light"
        android:textColor="@android:color/background_dark" />

</RelativeLayout>

这是第一个应用程序的java文件

    package arb.myapplication;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;

import org.jsoup.Connection;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Attribute;
import org.jsoup.nodes.Attributes;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;


public class MainActivity extends AppCompatActivity {

    class DownloadIcon extends AsyncTask<String, Object, Integer>
    {
        String uri="";

        public DownloadIcon(String s) {uri=s;
        }


        @Override
        protected Integer doInBackground(String... objects) {
            Connection connecion= Jsoup.connect("http://icons.better-idea.org/icons?url="+uri+"#result");
            Document document= null;
            try {
                document = connecion.get();
            } catch (IOException e) {
                e.printStackTrace();
            }
            Element element=document.select("td.url").first().child(0);
            String url=element.attr("href");
            InputStream inputStream= null;
            try {
                inputStream = new URL(url).openStream();
            } catch (IOException e) {
                e.printStackTrace();
            }
            Bitmap bitmap=BitmapFactory.decodeStream(inputStream);
            publishProgress(bitmap);
            return 0;
        }

        @Override
        protected void onProgressUpdate(Object... values) {
            ImageView imageView=(ImageView) findViewById(R.id.imageView);
            imageView.setVisibility(View.VISIBLE);
            Bitmap bitmap=(Bitmap) values[0];
            imageView.setImageBitmap(bitmap);
            //Toast.makeText(getBaseContext(),values[0].toString(),Toast.LENGTH_LONG).show();
        }

        @Override
        protected void onPostExecute(Integer integer) {
            Toast.makeText(getBaseContext(),"done",Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button button3=(Button) findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                EditText editText=(EditText) findViewById(R.id.editText);
                new DownloadIcon(editText.getText().toString()).execute();

            }
        });
    }
}

我将下载图像的代码复制到第二个应用程序并对其进行了一些小的更改但是它不再工作了 这是xml代码，在调用onResume()

时运行下载过程并不重要

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="arb.passwordmanager.MainActivity"
    android:background="@drawable/green_background">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/grid">


    </android.support.v7.widget.RecyclerView>

    <android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="true"
        app:fabSize="mini"
        app:srcCompat="@android:drawable/ic_menu_add"
        android:id="@+id/floatingActionButton"
        app:elevation="0dp"
        app:backgroundTint="#66FF66"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        android:src="@android:drawable/ic_delete"
        android:id="@+id/delete"/>

</RelativeLayout>

这是java文件

    package arb.passwordmanager;

import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.drawable.BitmapDrawable;
import android.os.AsyncTask;
import android.provider.ContactsContract;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.Html;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import org.jsoup.Connection;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import yellow5a5.actswitchanimtool.ActSwitchAnimTool;

public class MainActivity extends AppCompatActivity {

    Menu mMenu;
    void check_password_checked()
    {
        Boolean b=getIntent().getExtras().getBoolean("checked");
        if(!b)finish();
    }

    void receive_animation()
    {
        if(getIntent().getExtras().getBoolean("animation"))
        {
            FloatingActionButton fab=(FloatingActionButton) findViewById(R.id.floatingActionButton);
            new ActSwitchAnimTool(this)
                    .receiveIntent(getIntent())
                    .setAnimType(ActSwitchAnimTool.MODE_SHRINK)
                    .target(fab)
                    .build();
        }
    }

    void set_fab_click()
    {
        FloatingActionButton fab=(FloatingActionButton) findViewById(R.id.floatingActionButton);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FloatingActionButton fab=(FloatingActionButton) findViewById(R.id.floatingActionButton);
                Intent i=new Intent(getBaseContext(),add_account_activity.class);
                ActSwitchAnimTool asat=new ActSwitchAnimTool(MainActivity.this).setAnimType(0)
                        .target(fab)
                        .setShrinkBack(false)
                        .setmColorStart(Color.parseColor("#66FF66"))
                        .setmColorEnd(Color.parseColor("#66FF66"))
                        .startActivity(i,false)
                        ;
                asat.setAnimType(0).build();
            }
        });
    }

    GridLayoutManager gridLayoutManager;
    RecyclerView recyclerView;
    List <Item> items;
    void set_spans()
    {
        SharedPreferences sharedPreferences=getSharedPreferences("view",MODE_PRIVATE);
        Boolean b=sharedPreferences.getBoolean("grid",true);
        if(b)gridLayoutManager=new GridLayoutManager(this,3);
        else gridLayoutManager=new GridLayoutManager(this,1);
        recyclerView=(RecyclerView) findViewById(R.id.grid);
        recyclerView.setLayoutManager(gridLayoutManager);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        check_password_checked();
        receive_animation();
        set_fab_click();
        set_spans();
    }

    class DownloadIcon extends AsyncTask<Object, Object, Integer>
    {

        //String uri="";

        //public DownloadIcon(String s) {uri=s;
        //}


        @Override
        protected Integer doInBackground(Object... objects) {
            Connection connecion= Jsoup.connect("http://www.icons.better-idea.org/icons?url="+objects[0].toString()+"#result");

            try {
                Document document= connecion.get();
                Element element=document.select("td.url").first().child(0);
                String url=element.attr("href");
                InputStream inputStream = new URL(url).openStream();
                Bitmap bitmap=BitmapFactory.decodeStream(inputStream);
                //publishProgress(bitmap);
            } catch (IOException e) {
                publishProgress("http://www.icons.better-idea.org/icons?url="+objects[0].toString()+"#result");
                e.printStackTrace();

            }

            return 0;
        }

        @Override
        protected void onProgressUpdate(Object... values) {
           /* ImageView imageView=(ImageView) findViewById(R.id.imageView);
            imageView.setVisibility(View.VISIBLE);
            Bitmap bitmap=(Bitmap) values[0];
            imageView.setImageBitmap(bitmap);*/
            //Toast.makeText(getBaseContext(),values[0].toString(),Toast.LENGTH_LONG).show();
            Toast.makeText(getBaseContext(),values[0].toString(),Toast.LENGTH_LONG).show();
        }

        @Override
        protected void onPostExecute(Integer integer) {
            Toast.makeText(getBaseContext(),"done",Toast.LENGTH_SHORT).show();
        }
    }

    String correct_url(String s)
    {
        s=s.replace(" ","");
        if(!s.contains("."))s+=".com";
        else if(s.lastIndexOf(".")<s.length()-4)s+=".com";
        return s;
    }

    void init_data()
    {
        database d=new database(this,database.DATABASE_NAME,null,database.DATABASE_VERSION);
        SQLiteDatabase sqLiteDatabase=d.getReadableDatabase();
        Cursor cursor=sqLiteDatabase.rawQuery("SELECT * FROM "+database.TABLE_ACCOUNTS,null);
        items=new ArrayList<>(cursor.getCount());

        if(cursor.getCount()>0)
        {
            cursor.moveToFirst();
            do {
                File file =new File(String.valueOf(getFilesDir()),cursor.getString(0));
                Bitmap b =null;
                try {
                    b= BitmapFactory.decodeStream(new FileInputStream(file));
                    items.add(new Item(cursor.getString(0),cursor.getString(1),b));
                } catch (FileNotFoundException e) {
                    new DownloadIcon().execute(correct_url(cursor.getString(0)),b);
                }
                //items.add(new Item(cursor.getString(0),cursor.getString(1)))
            }while (cursor.moveToNext());
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        init_data();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        mMenu=menu;
        SharedPreferences sharedPreferences=getSharedPreferences("view",MODE_PRIVATE);
        Boolean b= sharedPreferences.getBoolean("grid",true);
        if(b)getMenuInflater().inflate(R.menu.edit_password,menu);
        else getMenuInflater().inflate(R.menu.list_view,menu);
        return true;
    }

    void settings()
    {
        Intent i=new Intent(this,Settings.class);
        i.putExtra("checked",true);
                startActivity(i);

    }

    void fab_click()
    {
    FloatingActionButton fab=(FloatingActionButton) findViewById(R.id.floatingActionButton);
        fab.performClick();
    }

    void list_view()
    {
        mMenu.clear();
        getMenuInflater().inflate(R.menu.edit_password,mMenu);
        SharedPreferences sharedPreferences=getSharedPreferences("view",MODE_PRIVATE);
        SharedPreferences.Editor editor=sharedPreferences.edit().putBoolean("grid",true);
        editor.commit();
        gridLayoutManager.setSpanCount(3);
    }

    void grid_view()
    {
        mMenu.clear();
        getMenuInflater().inflate(R.menu.list_view,mMenu);
        SharedPreferences sharedPreferences=getSharedPreferences("view",MODE_PRIVATE);
        SharedPreferences.Editor editor=sharedPreferences.edit().putBoolean("grid",false);
        editor.commit();
        gridLayoutManager.setSpanCount(1);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId())
        {
            case R.id.settings_menu :
                settings();
                return true;
            case R.id.add_new_account_menu:
                fab_click();
                return true;
            case R.id.list_view:
                list_view();
                return true;
            case R.id.grid_view:
                grid_view();
                return true;
            default: return true ;

        }
    }
}

唯一重要的部分是在onResume（）中运行的init_data() void 它检查数据库中的特定数据并搜索并下载图像 我使用“facebook.com”作为参数发送到异步任务，但它不工作，虽然它在第一个应用程序中工作

它返回以下错误

W/System.err: java.net.UnknownHostException: Unable to resolve host "www.icons.better-idea.org": No address associated with hostname
W/System.err:     at java.net.InetAddress.lookupHostByName(InetAddress.java:424)
W/System.err:     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
W/System.err:     at java.net.InetAddress.getAllByName(InetAddress.java:214)
W/System.err:     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
W/System.err:     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
W/System.err:     at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:362)
W/System.err:     at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
W/System.err:     at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
W/System.err:     at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
W/System.err:     at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
W/System.err:     at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
W/System.err:     at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
W/System.err:     at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
W/System.err:     at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:652)
W/System.err:     at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:629)
W/System.err:     at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:261)
W/System.err:     at org.jsoup.helper.HttpConnection.get(HttpConnection.java:250)
W/System.err:     at arb.passwordmanager.MainActivity$DownloadIcon.doInBackground(MainActivity.java:125)
W/System.err:     at arb.passwordmanager.MainActivity$DownloadIcon.doInBackground(MainActivity.java:111)
W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:287)
W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
W/System.err:     at java.lang.Thread.run(Thread.java:856)
W/System.err: Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
W/System.err:     at libcore.io.Posix.getaddrinfo(Native Method)
W/System.err:     at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:59)
W/System.err:     at java.net.InetAddress.lookupHostByName(InetAddress.java:405)
W/System.err:   ... 24 more
W/System.err: Caused by: libcore.io.ErrnoException: getaddrinfo failed: ENOENT (No such file or directory)
W/System.err:   ... 27 more
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/dalvikvm: GC_EXPLICIT freed 2905K, 21% free 14545K/18344K, paused 4ms+4ms, total 37ms
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4d6c1ab8, 0x4d6c1ab8) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglDestroySurface() surface: 0x4d6c1ab8, android window 0x4c056218, Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
D/HAWAII_EGL: eglMakeCurrent(0x40c84968, 0x4c1a4cf0, 0x4c1a4cf0) Thread: 4807
D/HAWAII_EGL: eglDestroyContext() context: 0x40c84968, VC context: 1, Thread 4807
E/HAWAII_EGL: Destroying surface without window
D/HAWAII_EGL: Destroying context in eglMakeCurrent
D/HAWAII_EGL: eglMakeCurrent(NULL) Thread: 4807
Disconnected from the target VM, address: 'localhost:8601', transport: 'socket'

我搜索了此问题的解决方案，并找到以下其中一项： 我应该包括我做过的互联网使用许可 然后我应该提供良好的互联网连接，并确保服务器正常工作 但第一个应用程序工作正常，而另一个应用程序没有，虽然他们使用相同的互联网连接并连接到同一台服务器并使用相同的网址 请帮帮我

Answer 1

尝试不使用＆＃34; www＆＃34;的链接我的意思是：＆＃34; http://www.icons.better-idea.org＆＃34;我认为你的代码中只有一个拼写错误