我在想有没有人能帮我一下。我试图创建一个自定义AlertDialog。为了做到这一点，我在styles.xml中添加了以下代码行
<resources>
<style name="CustomAlertDialog" parent="android:Theme.Dialog.Alert">
<item name="android:windowBackground">@drawable/color_panel_background</item>
</style>
</resources>
Color_panel_background.9.png位于可绘制文件夹。这也可以在Android SDK res文件夹。
以下是主要活动。
package com.customdialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
public class CustomDialog extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.setTheme(R.style.CustomAlertDialog);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("HELLO!");
builder .setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//MyActivity.this.finish();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//dialog.cancel();
}
});
AlertDialog alertdialog = builder.create();
alertdialog.show();
}
}
为了将主题应用到AlertDialog，我必须将主题设置为当前上下文。
然而，我似乎不能让应用程序显示自定义的AlertDialog。有人能帮我一下吗?
您可以通过修改活动的主题属性....来覆盖由活动生成的DialogFragments所使用的默认主题
在AndroidManifest.xml中设置活动的主题。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.helloworld">
<application
android:name=".App"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"> <!-- set all Activity themes to your custom theme -->
.....
</application>
</manifest>
在values/styles.xml中，重写用于确定派生的DialogFragments使用什么主题的项
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="AppTheme" parent="Theme.AppCompat">
<!-- override the default theme for DialogFragments -->
<item name="android:dialogTheme">@style/AppTheme.Dialog</item>
</style>
.....
</resources>
在values/styles.xml中，定义并配置你想要用于DialogFragments的主题
<?xml version="1.0" encoding="utf-8"?>
<resources>
.....
<!--
configure your custom theme for DialogFragments...
-->
<style name="AppTheme.Dialog" parent="Theme.AppCompat.Dialog.MinWidth">
<!-- override the default theme for DialogFragments spawned by this DialogFragment -->
<item name="android:dialogTheme">@style/AppTheme.Dialog</item>
<!--
OPTIONAL: override the background for the dialog...i am using a dark theme,
and for some reason, there is no themes for dialogs with dark backgrounds,
so, i made my own.
-->
<item name="android:windowBackground">@drawable/dialog__window_background</item>
<!--
add the title to the dialog's theme. you can remove it later by using
DialogFragment.setStyle()
-->
<item name="android:windowNoTitle">false</item>
<item name="windowNoTitle">?android:windowNoTitle</item>
</style>
.....
</resources>
可选:如果你使用一个黑暗的主题，并覆盖android:windowBackground，就像我在AppTheme。对话框，然后添加一个可绘制的/dialog__window_background.xml文件，内容如下:
<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="16dp"
android:insetTop="16dp"
android:insetRight="16dp"
android:insetBottom="16dp">
<shape android:shape="rectangle">
<corners android:radius="?dialogCornerRadius" />
<solid android:color="?android:colorBackground" />
</shape>
</inset>
任何试图在Fragment(使用支持库，即pre API 11)中做到这一点的人都应该这样做:
public class LoadingDialogFragment extends DialogFragment {
public static final String ID = "loadingDialog";
public static LoadingDialogFragment newInstance() {
LoadingDialogFragment f = new LoadingDialogFragment();
return f;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
StyleAlertDialog adb = new StyleAlertDialog(getActivity(), R.style.Your_Style);
adb.setView(getActivity().getLayoutInflater().inflate(R.layout.fragment_dialog_layout, null));
return adb;
}
private class StyleAlertDialog extends AlertDialog {
protected StyleAlertDialog(Context context, int theme) {
super(context, theme);
}
}
}
@Rflexor鼓励我扩展AlertDialog并公开构造函数
当你初始化Builder时，你可以直接分配一个主题:
AlertDialog.Builder builder = new AlertDialog.Builder(
getActivity(), R.style.MyAlertDialogTheme);
然后在values/styles.xml中自定义主题
<!-- Alert Dialog -->
<style name="MyAlertDialogTheme" parent="Theme.AppCompat.Dialog.Alert">
<item name="colorAccent">@color/colorAccent</item>
<item name="android:colorBackground">@color/alertDialogBackground</item>
<item name="android:windowBackground">@color/alertDialogBackground</item>
</style>
