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我正在學習android應用程序開發我已經創建了一個項目,使用指南http://www.edumobile.org/android/android-beginner-tutorials/ftp-message-viewer-in-android/,但獲取錯誤調用「ftp_host無法解析或不是字段」和「ftp_message_result無法解析或不能領域」。ftp_host無法解析或不是字段
我的佈局文件包括以下
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView android:text="@string/ftp_server_prompt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<EditText android:id="@+id/ftp_host"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textUri">
<requestFocus></requestFocus>
</EditText>
</LinearLayout>
<Button android:text="@string/ftp_button_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="showMessage"/>
<ScrollView android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:id="@+id/ftp_message_result"
android:textSize="@dimen/ftp_message_size"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</ScrollView>
</LinearLayout>
和我的MainActivity文件看起來像下面
import java.io.BufferedReader;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import android.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
private EditText mFtpHost;
private TextView mFtpMessageResult;
private static final int FTP_PORT = 8080;
/** Initializes the app when it is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_item);
mFtpHost = (EditText)findViewById(R.id.ftp_host);
mFtpMessageResult = (TextView)findViewById(R.id.ftp_message_result);
}
public void showMessage(View clickedButton) {
String host = mFtpHost.getText().toString();
try {
Socket socket = new Socket();//(host, FTP_PORT);
BufferedReader in = SocketUtils.getReader(socket);
List<String> results = new ArrayList<String>();
String line = in.readLine();
results.add(line);
if (line.startsWith("220-")) {
while((line = in.readLine()) != null) {
results.add(line);
if ((line.equals("220") || line.startsWith("220 "))) {
break;
}
}
}
String output = makeOutputString(results);
mFtpMessageResult.setText(output);
socket.close();
} catch (Exception e) {
mFtpMessageResult.setText("Unknown host: " + host);
e.printStackTrace(); // View this in DDMS window
}
}
private String makeOutputString(List<String> results) {
StringBuilder output = new StringBuilder();
for (String s: results) {
output.append(s + "\n");
}
return(output.toString());
}
}