如何在 material 警报对话框中设置按钮图标大小

Question

我有简单的 MaterialAlertDialog，我想为正按钮设置图标。所以我以编程方式设置图标，因为我想要多个警报对话框的唯一图标，并为所有 dialog

使用相同的主题

这是我的做法。

final MaterialAlertDialogBuilder dialogBuilder = new MaterialAlertDialogBuilder(SubListActivity.this, R.style.AlertDialogTheme);
dialogBuilder.setTitle("Delete selected files ?");

ListView modeList = new ListView(SubListActivity.this);
modeList.setPadding(50,50,50,50);

CustomArrayAdapter adapter = new CustomArrayAdapter(SubListActivity.this, temp);
modeList.setAdapter(adapter);
dialogBuilder.setView(modeList);

dialogBuilder.setNegativeButton(android.R.string.no, null);
dialogBuilder.setPositiveButton(R.string.delete, (dialog, which) -> {

    //Some function
                    
}).setPositiveButtonIcon(getDrawable(R.drawable.ic_item_delete)).create().show();

主题

<style name="AlertDialogTheme" parent="ThemeOverlay.MaterialComponents.Dialog.Alert">
    <item name="buttonBarNegativeButtonStyle">@style/NegativeButtonStyle</item>
    <item name="buttonBarPositiveButtonStyle">@style/PositiveButtonStyle</item>
</style>

<style name="NegativeButtonStyle" parent="Widget.MaterialComponents.Button.TextButton.Dialog">
    <item name="rippleColor">@color/primarySubText</item>
    <item name="android:textColor">@color/primarySubText</item>
</style>

<style name="PositiveButtonStyle" parent="Widget.MaterialComponents.Button.TextButton.Icon">
    <item name="rippleColor">@color/secondaryLightColor</item>
    <item name="android:textColor">@color/darkRed</item>
    <item name="iconTint">@color/darkRed</item>
    <item name="iconSize">4dp</item>
    <item name="iconPadding">4dp</item>
</style>

结果：

如果我在主题中设置图标，大小适合按钮。但正如我之前提到的，我想为所有对话框设置唯一的图标。

那么如何调整图标大小呢？

Answer 1

fun showAlert(): AlertDialog {
  // for example we have drawable
  val drawable: Drawable = ContextCompat.getDrawable(activity, R.drawable.positive)
  // our material dialog builder
  val alertDialogBuilder = MaterialAlertDialogBuilder(activity, R.style.AlertDialogStyle)
    /**
    then do something here, set title, body, etc..
    */
  // get alert dialog from builder
  val alertDialog = alertDialogBuilder.create()
  // for example, we add drawable to positive button
  alertDialog.setOnShowListener {
    // now we can get positive button from alertDialog
    val positiveButton = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE)
    // text size of our button
    val textSize = positiveButton.textSize.toInt()
    // drawable. we set size here
    val positiveDrawableResized = drawable.apply { setBounds(0, 0, textSize, textSize) }
    // add drawable to button
    positiveButton.setCompoundDrawables(positiveDrawableResized, null, null, null)
    // positive button click listener (if needed)
    positiveButton.setOnClickListener { alertDialog.dismiss() }
  }
  // finally, show dialog
  alertDialog.show()
  return alertDialog
}

如何在 material 警报对话框中设置按钮图标大小

How to set button icon size in material alert dialog

android

android-alertdialog

material-design

iconbutton