Android 返回键返回显示退出弹窗特效

Android 返回键返回显示退出弹窗特效

    /**
     * 返回键退回到登陆页面
     **/
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
            exitDialog();
            return true;
        }
        return false;
    }

    /**
     * 退出App对话框
     */
    private void exitDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setMessage(“您确定想要退出么?”);
        builder.setTitle("信息");
        builder.setPositiveButton(“确认”), (dialog, which) -> {
            dialog.dismiss();
            MainActivity.this.finish();
        });
        builder.setNegativeButton(“退出"), (dialog, which) -> dialog.dismiss());
        builder.create().show();
    }