How to check if a value is a double value in Android (Java)

To check if a value is a double value in Android you can use the snippet below.

Samples

Java (Android) Sample

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How to refresh the current Android Fragment

To refresh the current Android Fragment you can use the snippet below. The code must be placed inside the Fragment that needs to be updated. The snippet will call the onCreateView Method of the Fragment.

Samples

Sample Java

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    How to show software keyboard when focusing textedit in Android

    To show software keyboard when focusing textedit in Android you can use the snippet below.

    Sample Java

    myTextEdit.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean focus) {
            if (focus) {
                dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
            }
        }
    });
    

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    How to create an alert dialog in Android

    To create an alert dialog in Android you can use the following snippet.

    Sample Java

    new AlertDialog.Builder(this)
        .setTitle("Delete items")
        .setMessage("Are you sure you want to delete this items?")
        .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) { 
                // YES
            }
         })
        .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) { 
                // NO
            }
         })
        .setIcon(android.R.drawable.ic_dialog_alert)
         .show();
    

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    How to convert a string to enum in Java

    To convert a string to enum in Java you can use the following snippet.

    Considering the following enum.

    Sample Java

    public enum Testenum {
      One,Two,Three,Four
    }
    

    you can cast an string to enum like this:

    Sample Java

    Testenum.valueOf("Two");
    

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    How to check if one one string contains another string in Javascript

    To check if one one string contains another string in Javascript you can use the following method.

    Sample JS

    if(testString.indexOf("substring") > -1){
    }
    

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    How to read a file to string in Java

    To read a file to string in Java you can use the following snippet.

    Sample Java

    public static string readFileToString(FileInputStream _fileInputStream)
    {
    	try {  
    		DataInputStream dataInputStream = new DataInputStream (_fileInputStream);  
    		byte[] Bytes = new byte[dataInputStream.available ()];  
    		dataInputStream.readFully (Bytes);  
    		dataInputStream.close ();  
    		String result = new String (Bytes, 0, Bytes.length, "Cp850");  
    		return result;  
    	}  
    	catch (Exception e) {  
    		e.printStackTrace();  
    		return "";
    	} 
    }
    

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