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一開始一切工作完全正常..但後1個月不打開應用程序，這個錯誤出現。我沒有做任何改變。這是錯誤，我嘗試修復它。但仍然，問題是有..這個錯誤持續出現
01-18 17:54:43.271: W/dalvikvm(1244): threadid=1: thread exiting with uncaught exception (group=0xb4a51b90)
01-18 17:54:44.401: D/dalvikvm(1244): GC_FOR_ALLOC freed 124K, 7% free 3060K/3272K, paused 764ms, total 782ms
01-18 17:54:44.401: E/AndroidRuntime(1244): FATAL EXCEPTION: main
01-18 17:54:44.401: E/AndroidRuntime(1244): Process: com.sabry.javabmi, PID: 1244
01-18 17:54:44.401: E/AndroidRuntime(1244): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sabry.javabmi/com.sabry.javabmi.bmiLogger}: java.lang.NullPointerException
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.ActivityThread.access$700(ActivityThread.java:135)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.os.Handler.dispatchMessage(Handler.java:102)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.os.Looper.loop(Looper.java:137)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.ActivityThread.main(ActivityThread.java:4998)
01-18 17:54:44.401: E/AndroidRuntime(1244): at java.lang.reflect.Method.invokeNative(Native Method)
01-18 17:54:44.401: E/AndroidRuntime(1244): at java.lang.reflect.Method.invoke(Method.java:515)
01-18 17:54:44.401: E/AndroidRuntime(1244): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
01-18 17:54:44.401: E/AndroidRuntime(1244): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
01-18 17:54:44.401: E/AndroidRuntime(1244): at dalvik.system.NativeStart.main(Native Method)
01-18 17:54:44.401: E/AndroidRuntime(1244): Caused by: java.lang.NullPointerException
01-18 17:54:44.401: E/AndroidRuntime(1244): at com.sabry.javabmi.bmiLogger.initializeApp(bmiLogger.java:60)
01-18 17:54:44.401: E/AndroidRuntime(1244): at com.sabry.javabmi.bmiLogger.onCreate(bmiLogger.java:37)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.Activity.performCreate(Activity.java:5243)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-18 17:54:44.401: E/AndroidRuntime(1244): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
01-18 17:54:44.401: E/AndroidRuntime(1244): ... 11 more
01-18 17:54:52.581: I/Process(1244): Sending signal. PID: 1244 SIG: 9
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;
import com.sabry.javabmi.R;
import com.sabry.javabmi.bmiLogger;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TimePicker;
import android.widget.Toast;
public class bmiLogger extends Activity {
private Intent currentIntent;
private EditText edtWeight;
private EditText edtTime;
private EditText edtDate;
private Button btnChart;
private Calendar c;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bmi);
initializeApp();
}
private void initializeApp() {
// TODO Auto-generated method stub
edtWeight = (EditText) findViewById(R.id.edtWeight);
edtDate = (EditText) findViewById(R.id.edtDate);
edtTime = (EditText) findViewById(R.id.edtTime);
c = Calendar.getInstance();
currentIntent = getIntent();
Bundle extras = currentIntent.getExtras();
if(extras != null){
edtWeight.setText(extras.getString("weight"));
}
setCurrentDateOnView();
String FILENAME = "bmi_log.csv";
File file = getApplicationContext().getFileStreamPath(FILENAME);
if(!file.exists()) {
// Disable the Chart Button
btnChart.setEnabled(false);
}
}
DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, monthOfYear);
c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
setCurrentDateOnView();
}
};
TimePickerDialog.OnTimeSetListener time = new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
c.set(Calendar.HOUR_OF_DAY, hourOfDay);
c.set(Calendar.MINUTE, minute);
setCurrentDateOnView();
}
};
public void dateOnClick(View view) {
new DatePickerDialog(bmiLogger.this, date,
c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH )).show();
}
public void timeOnClick(View view) {
new TimePickerDialog(bmiLogger.this, time,
c.get(Calendar.HOUR), c.get(Calendar.MINUTE), false).show();
}
public void setCurrentDateOnView(){
//First alternative to make date and time
//int month, day, year, hours, minutes ;
//year = c.get(Calendar.YEAR);
//month = c.get(Calendar.MONTH);
//day = c.get(Calendar.DAY_OF_MONTH);
//hours = c.get(Calendar.HOUR);
//minutes = c.get(Calendar.MINUTE);
//Second approach
String dateFormat = "dd-MM-yyyy";
SimpleDateFormat sdf = new SimpleDateFormat(dateFormat, Locale.US);
edtDate.setText(sdf.format(c.getTime()));
String timeFormat = "hh:mm a";
SimpleDateFormat stf = new SimpleDateFormat(timeFormat, Locale.US);
edtTime.setText(stf.format(c.getTime()));
}
public void saveLogOnClick(View view) {
String FILENAME = "bmi_log.csv";
String entry = edtDate.getText().toString() + "," +
edtTime.getText().toString() + "," +
edtWeight.getText().toString() + "\n";
try {
FileOutputStream out = openFileOutput(FILENAME, Context.MODE_APPEND);
out.write(entry.getBytes());
out.close();
toastIt("Entry Saved");
btnChart.setEnabled(true);
} catch(Exception e) {
e.printStackTrace();
}
}
private void toastIt(String msg) {
// TODO Auto-generated method stub
Toast.makeText(bmiLogger.this, msg, Toast.LENGTH_LONG).show();
}
public void switchToCalc(View v){
finish();
}
}
at'bmiLogger.java'的第60行是什麼？ –
該文件的第60行沒有任何內容，但假設它是正確的文件並且行號稍微偏離，我建議在您試圖打開bmi_log.csv並查看是否成功的位置進行突破。 –