android入门 — PopupWindow

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    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="es.source.code.activity.popupwindowtest_tencentclass.MainActivity">

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="点击"
        android:onClick="btnClick"/>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="#fff"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="#0e2438"
        android:gravity="center"
        android:orientation="horizontal"
        >
        <TextView
            android:text="提醒"
            android:textSize="18sp"
            android:textColor="#fff"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:gravity="center"
        android:orientation="vertical"
        android:padding="10dp"
        >
        <TextView
            android:text="恭喜您,验证码发送成功"
            android:textSize="18sp"
            android:textColor="#000"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <Button
            android:id="@+id/btn"
            android:text="确定"
            android:textColor="#fff"
            android:textSize="14sp"
            android:layout_width="66dp"
            android:layout_height="30dp"
            android:background="@drawable/bg4"
            android:layout_marginTop="10dp"/>

    </LinearLayout>

</LinearLayout>

public class MainActivity extends AppCompatActivity {

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

        //View view = this.getLayoutInflater().inflate(R.layout.layout_myself_dialog, null);

        LayoutInflater inflater = LayoutInflater.from(this);
        View myView = inflater.inflate(R.layout.layout_myself_dialog, null);

        popupWindow = new PopupWindow(myView, 600, 450);
        myView.findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                popupWindow.dismiss();
            }
        });
    }

    PopupWindow popupWindow;
    public void btnClick(View v)
    {
        popupWindow.showAsDropDown(v);
    }

}