Android Components

Button:
java:
Button button = (Button ) findViewById(R.id.button );

button.setOnClickListener(new View.OnClickListener() {
    @Override    public void onClick(View view) {
        ///perform your code inside
    }
});
Xml:
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />

Textview:

java:
TextView textview = (TextView ) findViewById(R.id.textview );
textview.setText("your label text");
Xml:
<TextView
android:id="@+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />


EditText:

java:
EditText edittext= (EditText ) findViewById(R.id.edittext);
edittext.setText("your label text");
String getText=edittext.getText().toString();

Xml:
<EditText
android:id="@+id/edittext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="EditText" />




more matirial UI components:

Material
Layout
Button
List / Grid
ViewPager
Label / Form
Image
SeekBar
Progress
Menu
ActionBar
Dialog
Calendar
Graph
Animation
Parallax
Effect (Blur... etc)
Other