我想在android studio中創建一個FTP應用程序,但我似乎無法得到它的工作。經過一些調試後,我能夠避免在代碼中出現一些錯誤,但現在當我嘗試連接到在Ubuntu中創建的本地ftp服務器時,出現以下消息「錯誤:無法連接到主機192.168.1.2」(我的ftp服務器從筆記本電腦的終端連接時工作正常)。該應用程序編譯並安裝正常。下面是從MainActivity.java代碼無法連接到FTP服務器android ftp應用程序
public boolean bindService(Intent service, ServiceConnection conn, int flags) {
return false;
}
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView);
connect = (Button) findViewById(R.id.connect_button);
connect.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (isNetworkAvailable()) {
new FTPConnect().execute();
} else {
AlertDialog.Builder b = new AlertDialog.Builder(MainActivity.this);
b.setMessage("Internet connectivity failure.Try again!");
b.show();
}
}
});
}
class FTPConnect extends AsyncTask<Void, Void, Void> {
ProgressDialog pDialog;
@Override
protected void onPreExecute() {
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Connecting...");
pDialog.show();
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
runOnUiThread(new Runnable() {
@Override
public void run() {
ftpClient = new FTPClient();
try {
ftpClient.connect(FTPSERVER, PORT);
ftpClient.login(USERNAME, PASSWORD);
ftpClient.enterLocalPassiveMode();
System.out.println("status :: " + ftpClient.getStatus());
setContentView(R.layout.connected);
textView = (TextView) findViewById(R.id.textView);
FTPFile[] files = ftpClient.listFiles();
DateFormat dateFormater = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
for (FTPFile file : files) {
String details = file.getName();
if (file.isDirectory()) {
details = "[" + details + "]";
}
details += "\t\t" + file.getSize();
details += "\t\t" + dateFormater.format(file.getTimestamp().getTime());
System.out.println(details);
}
} catch (Exception e) {
Log.d(TAG, "Error: could not connect to host " + FTPSERVER);
}
}
});
return null;
}
@Override
protected void onPostExecute(Void result) {
if (null != pDialog && pDialog.isShowing()) {
pDialog.dismiss();
}
super.onPostExecute(result);
}
}
// Check Internet Connection
public boolean isNetworkAvailable() {
ConnectivityManager connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
return false;
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (NetworkInfo anInfo : info) {
if (anInfo.getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}
logcat的:
07-03 23:43:34.901 16781-16781/com.example.vagil.ftpclient_1 d/dalvikvm:晚啓用CheckJNI 07 -03 23:43:35.051 16781-16781/com.example.vagil.ftpclient_1 D/ActivityThread:setTargetHeapUtilization:0.25 07-03 23:43:35.051 16781-16781/com.example.vagil.ftpclient_1 D/ActivityThread:setTargetHeapIdealFree :8388608 07-03 23:43:35.051 16781-16781/com.example.vagil.ftpclient_1 D/ActivityThread:setTargetHeapConcurrentStart:2097152 07-03 23:43:35.391 16781-16781/com.example.vagil.f tpclient_1我/ dalvikvm:無法找到方法android.view.ViewGroup.onRtlPropertiesChanged,從方法android.support.v7.widget.Toolbar.onRtlPropertiesChanged引用 07-03 23:43:35.391 16781-16781/com.example.vagil。 ftpclient_1 W/dalvikvm:VFY:無法解析虛擬方法13338:Landroid/view/ViewGroup; .onRtlPropertiesChanged(I)V 07-03 23:43:35.391 16781-16781/com.example.vagil.ftpclient_1 D/dalvikvm: VFY:替換操作碼0x6f在0x0007 07-03 23:43:35.401 16781-16781/com.example.vagil.ftpclient_1 I/dalvikvm:無法找到方法android.content.res.TypedArray.getChangingConfigurations,從android方法引用。 support.v7.internal.widget.TintTypedArray.getChangingConfigurations 07-03 23:43:35.401 16781-16781/com.example.vagil.ftpclient_1 W/dalvikvm:VFY:無法解析虛擬方法413:Landroid/content/res/TypedArray; .getChang ()I 07-03 23:43:35.401 16781-16781/com.example.vagil.ftpclient_1 D/dalvikvm:VFY:將操作碼0x6e替換爲0x0002 07-03 23:43:35.401 16781-16781/com。 example.vagil.ftpclient_1 I/dalvikvm:無法找到方法android.content.res.TypedArray.getType,從方法android.support.v7.internal.widget.TintTypedArray.getType引用 07-03 23:43:35.401 16781- 16781/com.example.vagil.ftpclient_1 W/dalvikvm:VFY:無法解析虛擬方法435:Landroid/content/res/TypedArray; .getType(I)I 07-03 23:43:35.401 16781-16781/com .example.vagil.ftpclient_1 D/dalvikvm:VFY:將操作碼0x6e替換爲0x0002 07-03 23:43:35.511 16781-16781/com.example.vagil.ftpclient_1 D/libEGL:loaded/system/lib/egl/libEGL_adreno200 .so 07-03 23:43:35.511 16781-16781/com.example.vagil.ftpclient_1 D/l ibEGL:loaded /system/lib/egl/libGLESv1_CM_adreno200.so 07-03 23:43:35.521 16781-16781/com.example.vagil.ftpclient_1 D/libEGL:已加載/system/lib/egl/libGLESv2_adreno200.so 07 -03 23:43:35.521 16781-16781/com.example.vagil.ftpclient_1 I/Adreno200-EGL :: EGL 1.4 QUALCOMM build:AU_LINUX_ANDROID_JB_REL_2.0.3.04.01.02.21.107_msm8625_JB_REL_2.0.3_CL3357771_release_AU(CL3357771) 構建日期:02 /十三分之二十五週一 本地分支: 遠程分支:QUIC/jb_rel_2.0.3 本地補丁:NONE 重構科:AU_LINUX_ANDROID_JB_REL_2.0.3.04.01.02.21.107 + NOTHING 07-03 23:43:35.551 16781-16781 /com.example.vagil.ftpclient_1 D/OpenGLRenderer:啓用調試模式0 07-03 23:43:54.211 16781-16781/com.example.vagil.ftpc lient_1 I/AppCompatDelegate:活動的LayoutInflater已經安裝了Factory,因此我們無法安裝AppCompat的 07-03 23:45:45.431 16781-16781/com.example.vagil.ftpclient_1 D/MainActivity:錯誤:無法連接到主機192.168.1.2
你的gradle文件中是否有依賴關係?commons-net和commons- net-ftp jars? – andrewdleach
我在libs文件夾中添加了commons-net-1.4.1.jar,並且在MainActivity.java之上導入了這個導入org.apache.commons.net.ftp.FTPClient; import org.apache.commons .net.ftp.FTPFile; – vagelis
你可以發佈你的logcat跟蹤到這個問題嗎? – andrewdleach