将多个输入的数据保存到文件

Question

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，然后我试图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箱的数据。我尝试了很多方法，例如使用for循环和其他方法，但它仍然不起作用。我目前正在使用一个数组列表，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。 在调试应用程序时，只要添加新数据的第一位并停止，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 
      } 
      } 

     } 

} 

Answer 1

我很惊讶你没有看到它崩溃，因为它看起来像你对我应该得到一个NullPointerException你似乎不被设置值为location。此外，它看起来不对，你使用的是与ID R.id.LocationText视图设置的time值：

time = (EditText)findViewById(R.id.LocationText); 

，但很难确保不知道你在做什么究竟。