Coding Guidelines

Names

• Use PascalCase for identifier names
• Use camelCase for method names
• Use camelCase for property names and local variables
• Use whole words in names when possible

Strings

Use only "double quotes" for strings

Style

In order to keep the code consistent, please use the following conventions.

From here on good and bad are used to attribute things that would make the coding style match, or not match.

Indentation

We use tabs, not spaces.

good:

public class SubClass extends SuperClass {

    public void methodEx() {
        // something
    }
    // something
}

bad:

public class MyClass {
    public void myMethod() {
        // something
    }
    // something
} 

if:

if (conditional) {
    // something
} else if (conditional) {
    // something
} else {
    // something
}

switch:

switch (a) {
    case 'a':
        break;
    case 'b':
        // something
        break;
}

for:

for (int i = 0; i < n; i++) {
    // something
}

while:

while (conditional) {
    // something
}

Performance and Readability

It is more important to be correct than to be fast.

It is more important to be maintainable than to be fast.

Spaces

No space before an opening parenthesis when calling methods, or indexing, like this:

method(parameter);
array[];
ArrayList<>;

Do not put a space after the opening parenthesis and the closing one

good:

myMethod(a);
myArray[5];

bad:

myMethod( a );
myArray[ 10 ];

When you use for, please write statement inside parenthesis like this:

for (int i = 0; i < n; i++){
    // something
}

Braces

Inside a code block, put the opening brace on the same line

good:

public void methodEx() {
        // something
        // something
    }

ok:

public void methodEx() { code (); }

bad:

public void methodEx()
{
    // something
    // something
}

Use a space before an opening parenthesis when calling control blocks, like this:

good:

if (conditional) { code(); }
for (;;) { code(); }
switch (a) { code(); }
while (conditional) { code(); }

bad:

if(conditional){code();}

Multiline Comments

For long, multiline comments use either:

/**
* comment
* Blah
* Blah again
*/

Or:

// Blah
// Blah again
// fin

Tags

If there is another tag inside a tag:

good:

<LinearLayout
    // something
    // something>

    <another tag>
        <other tag
        // something />
    </another tag>
</LinerLayout>

bad:

<RelativeLayout
    // something
    />

<LinearLayout // something>
</LinearLayout>

<LinearLayout
    // something >
</LinearLayout>

otherwise:

good:

<ImageView
    // something
    // something />

bad:

<Button // something />

<TextView
    // something>
</TextView>

<ImageView
    // something
    // something/> 

ok only , , , :

<color name="color">#000000</color>
<dimen name="margin">10dp</dimen>
<string name="string">string</string>
<item name="item">true</item>

Attributes

Don't use space

good:

android:layout_width="match_parent"

bad:

android: layout_height = "match_parent"