<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.top4.MainActivity" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

</RelativeLayout>

View view=getLayoutInflater().inflate(R.layout.activity_main,null);

            //定义一个Toast

        Toast ts=new Toast(this);

        //将该Tosat输出到 View

        ts.setView(view);

        //设置Toast时间

        ts.setDuration();

        //设置Tost的位置

        ts.setGravity(Gravity.BOTTOM|Gravity.RIGHT,,);

        //最后要记得加.show();不加就不会显示

        ts.show();