Android自定義Dialog及其相關注意事項

本文主要是定義直款頂端黑色背景的自定義Dialog，之前在用的時候發現PopupWindow需要依賴於Activity的創建，需要在OnWindowFoucus之後才能展示，這樣就導致一進界面就加載會報Activiy沒有創建完的Exception，但是Dialog就不會有這個問題。

這個頂部自定義Dialog有左右兩個按鈕，可有動態設置按鈕文字，以及監聽，還可以設置自動關閉功能。

首先是自定義Dialog

 private static class TipsDialog extends Dialog {

        private String leftText;
        private String title;
        private String rightText;


        private Button leftButton;
        private Button rightButton;
        private TextView titleTV;

        private BoTaiTipsInterface lCall;
        private BoTaiTipsInterface RCall;

        private final int SHOW_TIME = 3000;
        Handler handler;

        public TipsDialog(Activity activity, String title, String left, String right, BoTaiTipsInterface leftInterface, BoTaiTipsInterface rightInterface, int cancelTime) {
            super(activity, R.style.TipsDialogStyle); <span style="font-family: Arial, Helvetica, sans-serif;">// </span>這裏一定要添加style，否則不會展示
            this.leftText = left;
            this.rightText = right;
            this.lCall = leftInterface;
            this.RCall = rightInterface;
            this.title = title;

            handler = new Handler(Looper.getMainLooper()) {//延時自動關閉功能
                @Override
                public void handleMessage(Message msg) {
                    dismissDialog();
                }
            };
            if (cancelTime != 0) {
                handler.sendEmptyMessageDelayed(1, cancelTime);
            } else {
                handler.sendEmptyMessageDelayed(1, SHOW_TIME);
            }
        }

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            try {
                View mBannerView = LayoutInflater.from(getContext()).inflate(R.layout.dialog_banner, null);
                setCancelable(false);
                leftButton = (Button) mBannerView.findViewById(R.id.left_button);
                rightButton = (Button) mBannerView.findViewById(R.id.right_button);
                titleTV = (TextView) mBannerView.findViewById(R.id.title);
                if (StringUtils.isEmpty(title)) {
                    titleTV.setVisibility(View.INVISIBLE);
                } else {
                    titleTV.setText(title);
                }
                if (StringUtils.isEmpty(leftText)) {
                    leftButton.setVisibility(View.INVISIBLE);
                } else {
                    leftButton.setText(leftText);
                    if (null != lCall) {
                        lCall.onKey();
                    }
                }

                if (StringUtils.isEmpty(rightText)) {
                    rightButton.setVisibility(View.INVISIBLE);
                } else {
                    rightButton.setText(rightText);
                    if (null != RCall) {
                        RCall.onKey();
                    }
                }
                setContentView(mBannerView);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void dismiss() {
            try {
                handler.removeMessages(1);
                super.dismiss();
            } catch (Exception e) {
            }
        }
    }

Handler通過發送延遲消息達到定時關閉的功能。

Style:

    <style name="TipsDialogStyle" >
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowFrame">@null</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowAnimationStyle">@style/TipsDialogAnimStyle</item>
    </style>
    <style name="TipsDialogAnimStyle">
        <item name="android:windowEnterAnimation">@anim/tips_dialog_alpha_in</item>
        <item name="android:windowExitAnimation">@anim/tips_dialog_alpha_out</item>
    </style>

展示自定義Dialog控制類

    private static TipsDialog mDialog;

    public static void showNoButtonDialog(Activity activity, String title, int time) {
        showDialog(activity, title, null, null, null, null, time);
    }

    /**
     * @param activity
     * @param title
     * @param left
     * @param right
     * @param leftInterface
     * @param rightInterface
     */
    public static void showDialog(Activity activity, String title, String left, String right, BoTaiTipsInterface leftInterface, BoTaiTipsInterface rightInterface, int showTime) {
        try {
            if (activity == null) {
                return;
            }
            if (mDialog != null && mDialog.isShowing()) {
                mDialog.dismiss();
            }
            mDialog = new TipsDialog(activity, title, left, right, leftInterface, rightInterface, showTime);
            mDialog.show();
            Window dialogWindow = mDialog.getWindow();
            WindowManager.LayoutParams lp = dialogWindow.getAttributes();
            WindowManager m = activity.getWindowManager();
            Display d = m.getDefaultDisplay(); // 獲取屏幕寬、高用
            lp.dimAmount = 0;//背景不變暗
            lp.width = (int) (d.getWidth());//寬度撐滿屏幕
            mDialog.setCanceledOnTouchOutside(true);
            dialogWindow.setGravity(Gravity.LEFT | Gravity.TOP);//展示位置
            dialogWindow.setAttributes(lp);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /***
     * 取消dialog顯示
     */
    public static void dismissDialog() {
        try {
            if (mDialog != null && mDialog.isShowing()) {
                mDialog.dismiss();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

lp.dimAmount = 0;這個參數和<span style="color: rgb(68, 68, 68); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(243, 248, 251);"> </span><wbr style="color: rgb(68, 68, 68); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(243, 248, 251);"><span style="color: rgb(68, 68, 68); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(243, 248, 251);"><item name="android:backgroundDimEnabled">false</item>按說是一樣的，不過自定義的好像不太好用，所以還是使用lp.dimamount=0；這個動態方法進行設置</span></wbr>