Android弹出式提示框 PopupWindow

Android 弹出消息提醒——PopupWindow。

public class MainActivity extends Activity {    private PopupWindow pupWindow;    private TextView tv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void showWindow(){        if(pupWindow == null){             LayoutInflater la = LayoutInflater.from(MainActivity.this);             View view = la.inflate(R.layout.pupwindow, null);//自定义布局             tv = (TextView) view.findViewById(R.pupwindow.txt);             view.setOnClickListener(new OnClickListener() {                    @Override                    public void onClick(View v) {                        pupWindow.dismiss();                    }                });             pupWindow = new PopupWindow(view, LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);        }        tv.setText("this is pup window!");        //设置PopupWindow的焦点        pupWindow.setFocusable(true);        //点击PopupWindow之外的地方PopupWindow会消失        pupWindow.setOutsideTouchable(true);        //showAtLocation(View parent, int gravity, int x, int y)：相对于父控件的位置（例如正中央Gravity.CENTER，下方Gravity.BOTTOM等），可以设置偏移或无偏移        pupWindow.showAtLocation(MainActivity.this.getWindow().getDecorView(), Gravity.CENTER, 0, 0);        pupWindow.update();    }}

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