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Null Pointer exception on reading SMS stored in SIM in Android


Null Pointer exception on reading SMS stored in SIM in Android

By : Marian Buciu
Date : November 29 2020, 09:01 AM
should help you out I tried putting your code in a test app and also got NPE (Null Pointer Exception). The trace tells me that the following line has a problem and returning NPE.
code :
        Cursor cursor = getContentResolver().query(Uri.parse("content://sms/icc"), null, null, null, null);
        Cursor cursor = managedQuery(Uri.parse("content://sms"), null, null, null, null);


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Reading Image from internal memory android gives null pointer exception

Reading Image from internal memory android gives null pointer exception


By : Dipu
Date : March 29 2020, 07:55 AM
Any of those help it is because your bytes array is null, instantiate it, and assign size.
code :
 byte[] bytes = null;  // you should initialize it with some bytes size like new byte[100]
    try {
        fin.read(bytes);
    } catch (Exception e) {
        e.printStackTrace();
    }
byte[] bytes = new byte[fin.available()]
FileInputStream fin = null;

    ImageView img=new ImageView(this);
    try {
        fin = openFileInput("image.jpg");
        if(fin !=null && fin.available() > 0) {
            Bitmap bmp=BitmapFactory.decodeStream(fin) 
            img.setImageBitmap(bmp);
         } else {
            //input stream has not much data to convert into  Bitmap
          }
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
Java Null Pointer Exception in a File Reading Android Application

Java Null Pointer Exception in a File Reading Android Application


By : Chris Winning
Date : March 29 2020, 07:55 AM
Hope this helps I am new to android app development and I am developing an android app to read a .txt file containing spectrum data. The file contains integers and white spaces,so after reading every line the code trims the string to remove the white spaces and then converts the string containing string to integers The integers represents Y coordinate value and the line number represents X coordinate value. I have to plot a Scatter graph and I am using Achartengine for the same. When I try running the application on the emulator the app crashes. The Log cat gives this information , After inspecting your stacktrace
code :
Caused by: java.lang.NullPointerException
     at com.example.spec1readertest.MainActivity.onStart(MainActivity.java:89)
protected void onStart() {
    super.onStart();
    scatter = // initialize your scatter here first!
    view = scatter.getView(this);
    layout = (LinearLayout) findViewById(R.id.chart);
    layout.addView(view);
}
null pointer exception when reading textfile

null pointer exception when reading textfile


By : Speed6er
Date : March 29 2020, 07:55 AM
should help you out In your original code, you read in a line from the file and assign it to your line variable. You also check to make sure the line variable is not null in the condition for your while loop. However, you never update the value of your line variable, and instead you just read new lines into the s variable inside of your loop, never checking to see if s is null.
Here's your original code:
code :
StringBuilder sb = new StringBuilder();
String line = br.readLine();

while (line != null) {
    String s = br.readLine();

    parts = s.split("=");
    en=parts[0];
    sin=parts[1].split(" | ");

    sb.append("INSERT INTO `singlish`.`eng` (`eid`, `eword`) VALUES ('"+stpoint+"', '"+en+"');")
    sb.append(System.lineSeparator());

    System.out.println(en);

    for(int i=0;i<sin.length;i++) {
        sb.append("INSERT INTO `singlish`.`sng` (`eid`, `sword`) VALUES ('"+stpoint+"', '"+sin[i]+"');");
        sb.append(System.lineSeparator());
    }

    System.out.println(""+stpoint);
    stpoint++;
}
String line = br.readLine();

while (line != null) {
    String s = br.readLine();
for (String s; (s = br.readLine()) != null; ) {
StringBuilder sb = new StringBuilder();

for (String s; (s = br.readLine()) != null; ) {

    parts = s.split("=");
    en=parts[0];
    sin=parts[1].split(" | ");

    sb.append("INSERT INTO `singlish`.`eng` (`eid`, `eword`) VALUES ('"+stpoint+"', '"+en+"');")
    sb.append(System.lineSeparator());

    System.out.println(en);

    for(int i=0;i<sin.length;i++) {
        sb.append("INSERT INTO `singlish`.`sng` (`eid`, `sword`) VALUES ('"+stpoint+"', '"+sin[i]+"');");
        sb.append(System.lineSeparator());
    }

    System.out.println(""+stpoint);
    stpoint++;
}
Null Pointer Exception while reading from excel?

Null Pointer Exception while reading from excel?


By : user3719706
Date : March 29 2020, 07:55 AM
it helps some times for every .toString() add a " "+ x.toString() to it, so that the value doesnt become a null. `
code :
for (int i = 1; i < rowCount+1; i++) {
        Row row = RDSheet.getRow(i);
        //Check if the first cell contain a value, if yes, That means it is the new testcase name
    if((row.getCell(0)+"").toString().length()==0){
        //Print testcase detail on console
        System.out.println((row.getCell(1)+"").toString()+"----"+ (row.getCell(2)+"").toString()+"----"+
        (row.getCell(3)+"").toString()+"----"+ (row.getCell(4)+"").toString());
        //Call perform function to perform operation on UI
        //your operations
     }
else{

//Print the new testcase name when it started
            System.out.println("New Testcase->"+row.getCell(0).toString() +" Started");
            }
}


`
null pointer exception in reading tsv file

null pointer exception in reading tsv file


By : Håkan Fjäremo
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Obviously this variable is evaluated to null, since you never assign a value to it.
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