button.onclick android code example

Example 1: android studio button usage

//this for xml file 
<Button  
        android:id="@+id/button"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="109dp"  
        android:text="hello"  
 /> 

//this for java file 
Button btn;
  @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
  btn = (Button) findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {  
            @Override  
            public void onClick(View view) {  
               //do something
            }  
        }); 
    }

Example 2: android onlcik java

Button button = (Button) findViewById(R.id.button_send);
button.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        // Do something in response to button click
    }
});
//https://developer.android.com/guide/topics/ui/controls/button