首先，我想感谢大家对我最后几个问题的帮助。我已经搜索并尽力找出我最近的问题，但即使在这里搜索后我也没有运气。我正在尝试检查“heapFile.csv”是否存在，如果不存在，则创建文件然后将字符串写入其中。如果确实如此，我只想添加一个字符串。我认为我会做的就是这样但我不断得到一个IOException，并说文件系统是只读的。我确实已将清单文件更改为包括访问sdcard，甚至还使用了android来制作虚拟SD卡，以防出现问题。
首先这里是主要活动java ...
package com.loch.meaptracker;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TimePicker;
public class MainActivity extends Activity implements OnSeekBarChangeListener {
private SeekBar happyBar, energyBar, anxietyBar, painBar;
private EditText noteField;
private DatePicker dPick;
private TimePicker tPick;
@SuppressWarnings("unused")
private Button enterButton;
private int happyValue = 4, energyValue = 4, anxietyValue = 4,
painValue = 4;
private static final String TAG = "heapApp";
private String Mood = "Blah";
final Context context = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// bars
happyBar = (SeekBar) findViewById(R.id.happinessBarID);
happyBar.setOnSeekBarChangeListener(this);
energyBar = (SeekBar) findViewById(R.id.energyBarID);
energyBar.setOnSeekBarChangeListener(this);
anxietyBar = (SeekBar) findViewById(R.id.anxietyBarID);
anxietyBar.setOnSeekBarChangeListener(this);
painBar = (SeekBar) findViewById(R.id.painBarID);
painBar.setOnSeekBarChangeListener(this);
// end bars
dPick = (DatePicker) findViewById(R.id.datePicker1);
tPick = (TimePicker) findViewById(R.id.timePicker1);
noteField = (EditText) findViewById(R.id.noteTextFieldID);
enterButton = (Button) findViewById(R.id.enterButtonID);
} catch (Exception onCreateException) {
Log.e(TAG, "Exception received", onCreateException);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
// Bar listener methods
@Override
public void onProgressChanged(SeekBar arg0, int barValue, boolean hFromUser) {
try {
switch (arg0.getId()) {
case R.id.happinessBarID:
happyValue = barValue + 1;
break;
case R.id.energyBarID:
energyValue = barValue + 1;
break;
case R.id.anxietyBarID:
anxietyValue = barValue + 1;
break;
case R.id.painBarID:
painValue = barValue + 1;
break;
}
String debugBarValue = "Happy is " + happyValue + ", Energy is "
+ energyValue + ", Anxiety is " + anxietyValue
+ ", Pain is " + painValue + ".";
System.out.println(debugBarValue);
} catch (Exception BarValueException) {
Log.e(TAG, "Exception received", BarValueException);
}
}
@Override
public void onStartTrackingTouch(SeekBar happyBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar happyBar) {
// TODO Auto-generated method stub
}
// end Bar listener methods
// Enter Button listener Method
public void dialogPop(View v) {
try {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
context);
// set Title
alertDialogBuilder.setTitle("title");
// set dialog message
alertDialogBuilder.setMessage("You entered: " + getMood())
.setCancelable(false).setPositiveButton("Okay",
// When Okay button clicked the write mood string to file
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
try {
// This is the string that should be
// written to file
String data = getMood();
// This is the file that should be
// written to
File heapFile = new File(Environment.getExternalStorageDirectory(), "/heapFile.csv");
// if file doesn't exists, then create
// it
if (!heapFile.exists()) {
heapFile.createNewFile();
}
// true = append file
FileWriter heapFileWritter = new FileWriter(
heapFile.getName(), true);
BufferedWriter heapBufferWritter = new BufferedWriter(
heapFileWritter);
heapBufferWritter.write(data);
heapBufferWritter.close();
System.out.println("Done");
} catch (IOException e) {
e.printStackTrace();
}
}
})
// If they press either the cancel button or the back button
// on their device (Same thing) then close the dialog and
// give the user a chance to change what they've entered
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int id) {
// TODO Auto-generated method stub
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
} catch (Exception buttonListenerException) {
Log.e(TAG, "Exception received", buttonListenerException);
}
return;
}
public String getMood() {
try {
int month = dPick.getMonth();
int day = dPick.getDayOfMonth();
int year = dPick.getYear();
int minute = tPick.getCurrentMinute();
String moodAntePost = "AM";
boolean hourType = tPick.is24HourView();
int moodHour = tPick.getCurrentHour();
if (hourType == false && moodHour > 12) {
moodHour = (moodHour - 12);
moodAntePost = "PM";
} else if (hourType == false && moodHour <= 0) {
moodHour = 12;
} else {
}
String noteText = noteField.getText().toString();
Mood = "Happiness," + happyValue + ",Energy," + energyValue
+ ",Anxiety," + anxietyValue + ",Pain," + painValue
+ ",Date," + month + "/" + day + "/" + year + ",Time,"
+ moodHour + ":" + minute + "," + moodAntePost + ",Note,"
+ noteText;
System.out.println(Mood);
} catch (Exception getMoodException) {
Log.e(TAG, "Exception received", getMoodException);
}
return Mood;
}
}
而且清单......
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.loch.meaptracker"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.loch.meaptracker.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
答案 0 :(得分：1)
我认为问题在于这一行：
FileWriter heapFileWritter = new FileWriter(
heapFile.getName(), true);
改为尝试：
FileWriter heapFileWritter = new FileWriter(
heapFile, true);
<强>解释
heapFile.getName（）引用您的文件名，所以让我们说一下heapFile.txt。 所以当你要求FileWriter写入这个文件时。它不知道您指的是哪个文件。所以它尝试创建该文件。可是等等！它将创建文件的位置，因为它只有文件名，而不是完整的路径。
所以，即使我确定创建文件的位置，我猜是Root（我不确定）。这是只读的错误。
public FileWriter(String fileName, boolean append) throws IOExceptionIOException - 如果指定的文件存在但是是目录而不是 常规文件，不存在但无法创建或不能创建 因任何其他原因而被打开