Android9.0设置AlertDialog修改底部按钮居中等

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本文链接： https://blog.csdn.net/P876643136/article/details/94650545

     在小米9se版本，发现应用升级的对话框按钮都偏向左，讲真一开始就考虑是小米又特立独行了。

     下面再介绍下出现情况的解决方案，代码如下，两种处理方案：

        if (downloadDialog != null && downloadDialog.isShowing()) {
            downloadDialog.dismiss();
        }

        AlertDialog.Builder builder = new Builder(mContext, R.style.loading_dialog);
        builder.setTitle("更新");

        final LayoutInflater inflater = LayoutInflater.from(mContext);
        View v = inflater.inflate(R.layout.progress, null);
        mProgress = (ProgressBar) v.findViewById(R.id.progress);

        builder.setView(v);
        builder.setNegativeButton("取消", new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                interceptFlag = true;
            }
        });
        downloadDialog = builder.create();
        downloadDialog.setCancelable(false);
        downloadDialog.setCanceledOnTouchOutside(false);
        downloadDialog.show();

        //必须在downloadDialog.show();之后再进行处理
        //        AlertDialog按键居中的处理，法一：
        final Button mNegativeButton = downloadDialog.getButton(AlertDialog.BUTTON_NEGATIVE);
        LinearLayout.LayoutParams mNegativeButtonLL = (LinearLayout.LayoutParams) mNegativeButton.getLayoutParams();
        mNegativeButtonLL.gravity = Gravity.CENTER;
//        mNegativeButtonLL.width = ViewGroup.LayoutParams.MATCH_PARENT;
        mNegativeButton.setLayoutParams(mNegativeButtonLL);

 //        AlertDialog按键居中的处理，法二：
//        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
//        layoutParams.weight = 1.0f;
//        layoutParams.gravity = Gravity.CENTER;
//        downloadDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setLayoutParams(layoutParams);

更具体，可查看 align AlertDialog buttons to center

此外，若设置标题居中：

标题居中

		TextView title = new TextView(this);
        title.setText("My Custom Title");
        title.setPadding(0, 25, 0, 0);
        title.setGravity(Gravity.CENTER);
        title.setTextSize(18);
        title.setTextColor(Color.BLACK);

        AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.CustomAlertDialog);
        AlertDialog dialog = builder.setCustomTitle(title)
        //其它同上

若底部按钮为英文，改大小写时

<style name="CustomAlertDialog" parent="@style/Theme.AppCompat.Light.Dialog.Alert">
        <item name="buttonBarButtonStyle">@style/CustomAlertDialogButton</item>
</style>

<style name="CustomAlertDialogButton" parent="Widget.AppCompat.Button.ButtonBar.AlertDialog">
        <item name="textAllCaps">false</item> <!--关闭默认大写的设置 -->
</style>

//最后通过构造函数将样式传进去
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity(), R.style.CustomAlertDialog);

举栗子：

看到底部的三个按钮不是居中的，Negative按钮偏右；标题朝左。可以做如下调整：

 设置头部：
		TextView title = new TextView(this);
        title.setText("My Custom Title");
        title.setPadding(0, 25, 0, 0);
        title.setGravity(Gravity.CENTER);
        title.setTextSize(18);
        title.setTextColor(Color.BLACK);

        AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.CustomAlertDialog);
        AlertDialog dialog = builder.setCustomTitle(title)
        //其它同上
     

设置按钮居中：
  AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.CustomAlertDialog);
        AlertDialog dialog = builder.setTitle("My Title")
                .setMessage("My Message")
                .setPositiveButton("Positive", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        showToast("Positive");
                    }
                }).setNeutralButton("Neutral", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        showToast("Neutral");
                    }
                }).setNegativeButton("Negative", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        showToast("Negative");
                    }
                }).create();
        dialog.show();
        
		//一定要在dialog.show()之后才能执行下面的代码
		
        Button mNegativeButton = dialog.getButton(AlertDialog.BUTTON_NEGATIVE);
        Button mPositiveButton = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
        Button mNeutralButton = dialog.getButton(AlertDialog.BUTTON_NEUTRAL);

        LinearLayout.LayoutParams positiveButtonLL = (LinearLayout.LayoutParams) mPositiveButton.getLayoutParams();
        positiveButtonLL.weight = 1;
        mPositiveButton.setLayoutParams(positiveButtonLL);

        LinearLayout.LayoutParams mNegativeButtonLL = (LinearLayout.LayoutParams) mNegativeButton.getLayoutParams();
        mNegativeButtonLL.weight = 1;
        mNegativeButton.setLayoutParams(mNegativeButtonLL);

        LinearLayout.LayoutParams mNeutralButtonLL = (LinearLayout.LayoutParams) mNeutralButton.getLayoutParams();
        mNeutralButtonLL.weight = 1;
        mNeutralButton.setLayoutParams(mNeutralButtonLL);