PopupWindow

代码

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_pup;
    private RelativeLayout relativeLayout;

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

    private void initView() {
        relativeLayout = (RelativeLayout) findViewById(R.id.rel);
        btn_pup = (Button) findViewById(R.id.btn_pup);

        btn_pup.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_pup:
//                显示一个popupindoww
//                创建一个popupwindow对象
                View popupview = LayoutInflater.from(this).inflate(R.layout.popupview, null);
                TextView renrenTv = (TextView) popupview.findViewById(R.id.tv_renren);

                renrenTv.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(MainActivity.this, "确定分享到人人网平台?", Toast.LENGTH_SHORT).show();
                    }
                });
                PopupWindow popupWindow = new PopupWindow(popupview, ViewGroup.LayoutParams.MATCH_PARENT, 300);
//               点击popupwindow以外的区域，popupwindow消失
                popupWindow.setBackgroundDrawable(new BitmapDrawable());
//              获取焦点
                popupWindow.setFocusable(true);
//              给popupwindow设置动画样式（进入、退出）
                popupWindow.setAnimationStyle(R.style.mypopupstyle);
//                显示popupwindow(参数一:代表的是界面的布局容器,参数二:具体的位置由gravity去确定,参数三和参数四都是偏移量)
                popupWindow.showAtLocation(relativeLayout, Gravity.BOTTOM, 0, 0);
                break;
        }
    }
}

xml里

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/rel"
    tools:context="com.example.day05popupwindow.MainActivity">

    <Button
        android:gravity="center"
        android:id="@+id/btn_pup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="弹出一个popupwindow"
        />
</RelativeLayout>

PopupWindow要弹出的xml

<?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="200dp"
    android:background="#00acff"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/tv_renren"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:text="人人网"
        android:textColor="#fff"
        android:textSize="20sp" />

    <TextView
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:text="qq好友"
        android:textColor="#fff"
        android:textSize="20sp" />

    <TextView
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:text="朋友圈"
        android:textColor="#fff"
        android:textSize="20sp" />
</LinearLayout>