我想将文件上传到FTP。我使用的是simpleftp.jar。这是我的代码，它总是失败停止工作
MainActivity.java
import android.content.Intent;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import org.jibble.simpleftp.SimpleFTP;
import java.io.File;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
private static int RESULT_LOAD_IMG = 1;
String imgDecodableString;
Button btn;
TextView tv;
static final String FTP_HOST= "ftp://ftp.lomapod.esy.es/";
/********* FTP USERNAME ***********/
static final String FTP_USER = "xxxxxxxxxx";
/********* FTP PASSWORD ***********/
static final String FTP_PASS ="xxxxxxxxx";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(Button) findViewById(R.id.buttonUploadPicture);
tv=(TextView) findViewById(R.id.textView);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File f = new File(imgDecodableString);
String name=f.getName();
// Upload sdcard file
uploadFile(name);
}
});
}
// public void onClick(View v){
//
//// Bundle b=new Bundle();
//// Intent i=new Intent(getApplication(), DetailTransActivity.class);
//// Toast.makeText(this, "Upload Bukti Transaksi Berhasil",
//// Toast.LENGTH_LONG).show();
//// i.putExtras(b);
//// startActivity(i);
//
// }
public void loadImagefromGallery(View view) {
// Create intent to Open Image applications like Gallery, Google Photos
Intent galleryIntent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
// Start the Intent
startActivityForResult(galleryIntent, RESULT_LOAD_IMG);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
try {
// When an Image is picked
if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK
&& null != data) {
// Get the Image from data
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
// Get the cursor
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
// Move to first row
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filename = cursor.getString(columnIndex);
imgDecodableString = cursor.getString(columnIndex);
cursor.close();
File f= new File(""+imgDecodableString);
f.getName();
ImageView imgView = (ImageView) findViewById(R.id.imgView);
// Set the Image in ImageView after decoding the String
imgView.setImageBitmap(BitmapFactory
.decodeFile(imgDecodableString));
} else {
Toast.makeText(this, "Pilih Bukti Transaksi",
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(this, "Upload Bukti Transaksi Gagal", Toast.LENGTH_LONG)
.show();
}
}
public void uploadFile(String fileName){
try {
SimpleFTP ftp = new SimpleFTP();
// Connect to an FTP server on port 21.
ftp.connect(FTP_HOST, 21, FTP_USER, FTP_PASS);
// Set binary mode.
ftp.bin();
// Change to a new working directory on the FTP server.
ftp.cwd("/assets/");
// Upload some files.
ftp.stor(new File(fileName));
// Quit from the FTP server.
ftp.disconnect();
Toast.makeText(MainActivity.this,"Success",Toast.LENGTH_LONG).show();
}
catch (IOException e) {
// Jibble.
Toast.makeText(MainActivity.this,"Failed",Toast.LENGTH_LONG).show();
}
}
}
总是给我这个错误。当我点击它指向
的错误时ftp.connect（FTP_HOST，21，FTP_USER，FTP_PASS）;
05-08 22:17:43.126 24537-24537/com.amobi.imageuploading E/AndroidRuntime: FATAL EXCEPTION: main
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
at java.net.InetAddress.getAllByName(InetAddress.java:214)
at java.net.Socket.tryAllAddresses(Socket.java:108)
at java.net.Socket.<init>(Socket.java:177)
at java.net.Socket.<init>(Socket.java:149)
at org.jibble.simpleftp.SimpleFTP.connect(SimpleFTP.java:68)
at com.amobi.imageuploading.MainActivity.uploadFile(MainActivity.java:121)
at com.amobi.imageuploading.MainActivity$1.onClick(MainActivity.java:49)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
任何人都可以帮我找到导致此错误的原因吗？谢谢
答案 0 :(得分：1)
将这段代码放在setContentView();
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
答案 1 :(得分：0)
您可以阅读有关NetworkOnMainThreadException here的信息。如果您正在使用网络操作，NetworkOnMainThreadException是一个非常流行的例外。