Android Button Onclick

Method 1:

public void onClick(View v) {
          Intent i = new Intent(currentActivity.this, SecondActivity.class);
         startActivty(i);
        }

Method 2:

Button button = (Button) findViewById(R.id.mybutton);
 button.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {
         Toast.makeText(this, "Button Clicked", Toast.LENGTH_LONG).show();

    }
 });

Method 3:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);

}

@OnClick(R.id.button)
    void submitButton(View view) {
            Toast.makeText(this, "Click", Toast.LENGTH_SHORT).show();
    }

@Override
    protected void onDestroy() {     
        //    defined in 'top level' of activity, not nested within another block
        //    code here is executed when the user quits the activity. 
        super.onDestroy();
        mSearchedLocationReference.removeEventListener(mSearchedLocationReferenceListener);
    }

compile 'com.jakewharton:butterknife:8.4.0' annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'


https://stackoverflow.com/questions/10231309/android-button-onclick
https://stackoverflow.com/questions/29603834/butterknife-onclick-is-not-working