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我正在 Android SDK 上创建一个简单的应用程序。我创建了一个 Android 客户端和 Java 服务器。现在我创建的是 Android 应用程序从图库中浏览图像并在屏幕上显示路径。此外，它还显示已显示的图像。要首先启动发送连接，我运行 Java 服务器。然后我在手机上运行该应用程序。我选择照片，然后按发送。应用程序在推送后出现问题并强制关闭。下面你可以看到我的代码。有任何想法吗？

安卓客户端

package com.example.workingclient;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class SendfileActivity extends Activity {
    /** Called when the activity is first created. */

    private static final int SELECT_PICTURE = 1;

    private String selectedImagePath;
    private ImageView img;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        System.out.println("34");
        img = (ImageView) findViewById(R.id.ivPic);
        System.out.println("36");
        ((Button) findViewById(R.id.bBrowse))
                .setOnClickListener(new OnClickListener() {
                    public void onClick(View arg0) {
                        System.out.println("40");
                        Intent intent = new Intent();
                        intent.setType("image/*");
                        intent.setAction(Intent.ACTION_GET_CONTENT);
                        startActivityForResult(
                                Intent.createChooser(intent, "Select Picture"),
                                SELECT_PICTURE);
                        System.out.println("47");
                    }
                });
        ;
        System.out.println("51");
        Button send = (Button) findViewById(R.id.bSend);
        final TextView status = (TextView) findViewById(R.id.tvStatus);

        send.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {

                Socket sock;
                try {
                    sock = new Socket("192.168.0.3", 27015); 
                    System.out.println("Connecting...");

                     // sendfile
                          File myFile = new File (selectedImagePath); 
                          byte [] mybytearray  = new byte [(int)myFile.length()];
                          FileInputStream fis = new FileInputStream(myFile);
                          BufferedInputStream bis = new BufferedInputStream(fis);
                          bis.read(mybytearray,0,mybytearray.length);
                          OutputStream os = sock.getOutputStream();
                          System.out.println("Sending...");
                          os.write(mybytearray,0,mybytearray.length);
                          os.flush();

                        sock.close();
                } catch (UnknownHostException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }



            }
        });
    }
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
                TextView path = (TextView) findViewById(R.id.tvPath);
                path.setText("Image Path : " + selectedImagePath);
                img.setImageURI(selectedImageUri);
            }
        }
    }

    public String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }
}

安卓主.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tvStatus"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="hello" />

    <TextView
        android:id="@+id/tvPath"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Path: " />

    <Button
        android:id="@+id/bBrowse"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Browse" >
    </Button>

    <Button
        android:id="@+id/bSend"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Send" />

    <ImageView
        android:id="@+id/ivPic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </ImageView>

</LinearLayout>

安卓AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.workingclient"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.workingclient.SendfileActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Java 服务器

import java.io.*;
import java.net.*;

public class FileServer {

    public static void main(String[] args) throws IOException {
        int filesize = 6022386; // filesize temporary hardcoded

        long start = System.currentTimeMillis();
        int bytesRead;
        int current = 0;

        // create socket
        ServerSocket servsock = new ServerSocket(27015);
        while (true) {
            System.out.println("Waiting...");

            Socket sock = servsock.accept();
            System.out.println("Accepted connection : " + sock);

            // receive file
            byte[] mybytearray = new byte[filesize];
            InputStream is = sock.getInputStream();
            FileOutputStream fos = new FileOutputStream(
                    "C:\\Users\\5750G\\Desktop\\Test.jpg"); // destination
                                                                    // path and
                                                                    // name of
                                                                    // file
            BufferedOutputStream bos = new BufferedOutputStream(fos);
            bytesRead = is.read(mybytearray, 0, mybytearray.length);
            current = bytesRead;

            // thanks to A. Cádiz for the bug fix
            do {
                bytesRead = is.read(mybytearray, current,
                        (mybytearray.length - current));
                if (bytesRead >= 0)
                    current += bytesRead;
            } while (bytesRead > -1);

            bos.write(mybytearray, 0, current);
            bos.flush();
            long end = System.currentTimeMillis();
            System.out.println(end - start);
            bos.close();

            sock.close();
        }
    }

}

错误

02-05 17:26:21.871: I/Start Server Button Clicked(22924): yipee
02-05 17:26:21.871: D/AndroidRuntime(22924): Shutting down VM
02-05 17:26:21.871: W/dalvikvm(22924): threadid=1: thread exiting with uncaught exception (group=0x40c5e1f8)
02-05 17:26:21.876: E/AndroidRuntime(22924): FATAL EXCEPTION: main
02-05 17:26:21.876: E/AndroidRuntime(22924): android.os.NetworkOnMainThreadException
02-05 17:26:21.876: E/AndroidRuntime(22924):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at libcore.io.IoBridge.connect(IoBridge.java:112)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.net.Socket.startupSocket(Socket.java:566)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.net.Socket.tryAllAddresses(Socket.java:127)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.net.Socket.<init>(Socket.java:177)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.net.Socket.<init>(Socket.java:149)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at com.example.workingclient.SendfileActivity$2.onClick(SendfileActivity.java:93)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at android.view.View.performClick(View.java:3627)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at android.view.View$PerformClick.run(View.java:14329)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at android.os.Handler.handleCallback(Handler.java:605)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at android.os.Looper.loop(Looper.java:137)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at android.app.ActivityThread.main(ActivityThread.java:4511)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.lang.reflect.Method.invokeNative(Native Method)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at java.lang.reflect.Method.invoke(Method.java:511)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
02-05 17:26:21.876: E/AndroidRuntime(22924):    at dalvik.system.NativeStart.main(Native Method)
02-05 17:26:47.916: I/Process(22924): Sending signal. PID: 22924 SIG: 9
02-05 17:36:15.351: I/System.out(23357): 34
02-05 17:36:15.351: I/System.out(23357): 36
02-05 17:36:15.351: I/System.out(23357): 51
02-05 17:36:15.416: D/CLIPBOARD(23357): Hide Clipboard dialog at Starting input: finished by someone else... !
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1 回答 1

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你有一个 NetworkOnMainThreadException。解决方案是将上传代码放在自己的线程或 AsyncTask 中。

于 2013-02-06T00:46:29.563 回答