我正在开发一个Android应用程序，用户必须在多个“edittext”框中输入文本，然后我尝试将输入的数据保存到文本文件中。我有我的应用程序来保存前几个框中的数据。我尝试了很多方法，比如使用for循环和其他方法，但它仍然不起作用。我目前正在使用数组列表，将前几位数据添加到列表中，将其写入文本文件，清除列表，然后添加其余数据并尝试将其附加到文件中。 在调试中，应用程序可以添加新数据的第一位并停止，而不会崩溃或出现任何错误。
这是我的代码：
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener{
private Button submitForm,resetForm,btnEmail;
private String saveName;
private EditText name,depot,date,time,location,details,outcome,did;
private String attachedPathFile;
private File folder;
File myFile;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//StrictMode.enableDefaults();
name = (EditText)findViewById(R.id.nameText);
depot = (EditText)findViewById(R.id.DepotText);
date = (EditText)findViewById(R.id.DateText);
time = (EditText)findViewById(R.id.LocationText);
details = (EditText)findViewById(R.id.IncidentText);
outcome = (EditText)findViewById(R.id.OutcomeText);
did = (EditText)findViewById(R.id.DetailsText);
submitForm = (Button)findViewById(R.id.SubmitButton);
submitForm.setOnClickListener(new OnClickListener(){
@SuppressLint("SimpleDateFormat")
public void onClick(View v) {
// write on SD card file data in the text box
try {
folder = new File(Environment.getExternalStorageDirectory(),"Close Call Reports");
folder.mkdirs();
saveName = new SimpleDateFormat("yyyy-MM-dd HH mm ss").format(new Date());
myFile = new File(Environment.getExternalStorageDirectory().toString()+"/Close Call Reports/"+saveName+".txt");
myFile.createNewFile();
// FileOutputStream fOut = new FileOutputStream(myFile, true);
// OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
//
// //gets text data to write to file
// String data = "Your Name: "+name.getText().toString()+"\n"+"Your Depot: "+depot.getText().toString()+"\n"+"Date: "+
// date.getText().toString()+"\n"+"Time: "+time.getText().toString()+"\n";
// String data2 ="Location: "+location.getText().toString()+
// "\n"+ "Incident: "+details.getText().toString()+"\n"+"Potential Outcome: "+outcome.getText().toString()+"\n"+
// "What did you do ? "+did.getText().toString();
List<String> data = new ArrayList<String>();
data.add("Your Name: "+name.getText().toString());
data.add("Your Depot: "+depot.getText().toString());
data.add("Date: "+date.getText().toString());
data.add("Time: "+time.getText().toString());
appendToFile(data);
data.clear();
Log.v("DEBUGGING", "got here 1");
//data = new ArrayList<String>();
data.add("Location: "+location.getText().toString());
data.add("Incident: "+details.getText().toString());
data.add("Potential Outcome: "+outcome.getText().toString());
data.add("What did you do ? "+did.getText().toString());
Log.v("DEBUGGING", "got here 2");
appendToFile(data);
Log.v("DEBUGGING", "got here 3");
// myOutWriter.append(data);
// myOutWriter.close();
// fOut.close();
// Toast.makeText(getBaseContext(),
// "Done writing Comment File",
// Toast.LENGTH_SHORT).show();
name.setText("");
depot.setText("");
date.setText("");
time.setText("");
location.setText("");
details.setText("");
outcome.setText("");
did.setText("");
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
// write on SD card file data in the text box
}// onClick
}); // btnWriteSDFile
btnEmail = (Button)findViewById(R.id.Emailbtn);
btnEmail.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
String[] emailTo = new String[]{"ameyandroidapp@gmail.com"};
String subject = "Close Call Reporting";
String [] filePaths= new String[1];
//if(filePaths[0]==null){
for(int a=0; a < filePaths.length;a++){
attachedPathFile = Environment.getExternalStorageDirectory().toString()+"/Close Call Reports/"+saveName+".csv";
//path+ls+saveName+"("+a+")"+".txt";
filePaths[a] = attachedPathFile;
}
sendEmail(emailTo,subject,filePaths);
// }else{
// Toast.makeText(getBaseContext(),"No Files To Email",Toast.LENGTH_LONG).show();
//}
}
});
resetForm = (Button)findViewById(R.id.ResetButton);
resetForm.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
name.setText("");
depot.setText("");
date.setText("");
time.setText("");
location.setText("");
details.setText("");
outcome.setText("");
did.setText("");
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void sendEmail(String[] emailTo, String subject,
String[] filePaths) {
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND_MULTIPLE);
emailIntent.setData(Uri.parse("mailto: "));
emailIntent.putExtra(Intent.EXTRA_EMAIL, emailTo);
emailIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
emailIntent.setType("message/rfc822");
ArrayList<Uri> uris = new ArrayList<Uri>();
for(String file: filePaths){
File fileIn = new File(file);
Uri u = Uri.fromFile(fileIn);
uris.add(u);
}
//emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM,uris);
emailIntent.putExtra(android.content.Intent.EXTRA_STREAM, uris);
startActivity(Intent.createChooser(emailIntent, "Email"));
}
@Override
public void onClick(View v) {
}
public void appendToFile (List<String> SarrayList) {
BufferedWriter bw = null;
boolean myappend = true;
try {
bw = new BufferedWriter(new FileWriter(myFile, myappend));
for(String line: SarrayList ) {
bw.write(line);
bw.newLine();
}
bw.flush();
} catch (IOException ioe) {
ioe.printStackTrace();
} finally {
if (bw != null) try {
bw.close();
} catch (IOException ioe2) {
// ignore it or write notice
}
}
}
}
答案 0 :(得分：1)
我很惊讶你没有看到它崩溃，因为我觉得你应该得到一个NullPointerException，因为你似乎没有设置{的价值{1}}。此外，您使用ID为R.id.LocationText的视图设置location的值时看起来不对：
time但如果不知道自己到底做了什么，就很难确定。