• 項目中為了實現(xiàn)賬號多設(shè)備登錄的監(jiān)聽 一個賬號在別的設(shè)備登錄時在該設(shè)備上需要彈出對話框提示 故而用到全局對話框

實現(xiàn)方式

• [ 1 ]. 添加權(quán)限

 <!--全局彈窗的權(quán)限-->
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

• [ 2 ]. 設(shè)置dialog類型

一定要在show之前設(shè)置
如果類型為TYPE_SYSTEM_ALERT需要開啟懸浮窗權(quán)限 使用相當(dāng)不方便
因此使用TYPE_TOAST 一般設(shè)備不需要特意去開啟權(quán)限即可使用

//設(shè)置彈出全局對話框
        dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_TOAST);
//dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
        dialog.show();

• [ 3 ]. 完整代碼

public static void showDialog(final Context context, final String title, final Boolean isCancelable, final String ok, final String close, final DialogCallback callback) {

        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        /*true 代表點擊空白可消失   false代表點擊空白哦不可消失 */
        builder.setCancelable(isCancelable);
        View view = View.inflate(context, R.layout.item_dialog_exit, null);
        TextView tv_itemdialog_title = (TextView) view.findViewById(R.id.tv_itemdialog_title);
        TextView tv_itemdialog_ok = (TextView) view.findViewById(R.id.tv_itemdialog_ok);
        TextView tv_itemdialog_close = (TextView) view.findViewById(R.id.tv_itemdialog_close);

        tv_itemdialog_ok.setText(ok);
        tv_itemdialog_close.setText(close);

        builder.setView(view);
        final AlertDialog dialog = builder.create();
        //設(shè)置彈出全局對話框
        dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_TOAST);
        dialog.show();

        tv_itemdialog_title.setText(title);
        tv_itemdialog_ok.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                callback.onPositive(dialog);
            }
        });

        tv_itemdialog_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                callback.onNegative(dialog);
            }
        });

使用WindowManager實現(xiàn)全局對話框

/**
     * 顯示彈出框
     *
     * @param context
     */
    public static void showPopupWindow(final Context context, final DialogCallback callback) {
        // 獲取WindowManager
        final WindowManager mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);


        final WindowManager.LayoutParams params = new WindowManager.LayoutParams();
        // 類型
        params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
        // 設(shè)置flag
        params.flags = WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        // 如果設(shè)置了WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE在抛，彈出的View收不到Back鍵的事件
        // 不設(shè)置這個彈出框的透明遮罩顯示為黑色
        params.format = PixelFormat.TRANSLUCENT;
        // FLAG_NOT_TOUCH_MODAL不阻塞事件傳遞到后面的窗口
        // 設(shè)置 FLAG_NOT_FOCUSABLE 懸浮窗口較小時进栽，后面的應(yīng)用圖標(biāo)由不可長按變?yōu)榭砷L按
        // 不設(shè)置這個flag的話义桂，home頁的劃屏?xí)袉栴}
        params.width = WindowManager.LayoutParams.WRAP_CONTENT;
        params.height = WindowManager.LayoutParams.WRAP_CONTENT;
        params.gravity = Gravity.CENTER;
        TextView textView = new TextView(context);
        textView.setText("sfgsfdsfbsadfbasdfg");
        textView.setTextSize(100);

        final View mView = LayoutInflater.from(context).inflate(R.layout.item_dialog_exit, null);
        TextView tv_itemdialog_title = (TextView) mView.findViewById(R.id.tv_itemdialog_title);
        TextView tv_itemdialog_ok = (TextView) mView.findViewById(R.id.tv_itemdialog_ok);
        TextView tv_itemdialog_close = (TextView) mView.findViewById(R.id.tv_itemdialog_close);

        tv_itemdialog_ok.setText("重新登錄");
        tv_itemdialog_close.setText("退出登錄");
        tv_itemdialog_title.setText("該賬戶在其他設(shè)備登錄,若不是您在操作,請及時修改密碼以防泄露信息");
        tv_itemdialog_ok.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 隱藏彈窗
                mWindowManager.removeView(mView);
                callback.onPositive();
            }
        });

        tv_itemdialog_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mWindowManager.removeView(mView);
                callback.onNegative();
            }
        });

        mWindowManager.addView(textView, params);
    }