In the below example I have created a custom toast Function in Android, the toast will open in center of the screen. Here I have used a image, image shown below contains a toast at the bottom of the screen. For more see the below code, in which I have described how to make custom toast in android.

Step(1)-MainActivity-

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button click = (Button)findViewById(R.id.button1);
        click.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                LayoutInflater inflater = getLayoutInflater();
                View layout = inflater.inflate(R.layout.toast_layout,
                                               (ViewGroup) findViewById(R.id.custom_toast_layout));

                    text.setText("Welcome In Evon ");

                Toast toast = new Toast(getApplicationContext());
                toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
                toast.setDuration(Toast.LENGTH_LONG);
                toast.setView(layout);
                toast.show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

Step(2)-Main.xml.Layout-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/custom_toast_layout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#DAAA"
    android:orientation="horizontal"
    android:padding="8dp" >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="8dp"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/black" />

</LinearLayout>