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?
我一直在努力解决这个问题-你可以在你的主题中使用android:alertDialogStyle="@style/AlertDialog"设置对话框的背景，但它忽略了你所拥有的任何文本设置。正如@rflexor上面所说的，在Honeycomb之前的SDK无法做到这一点(你可以使用Reflection)。
简而言之，我的解决方案是使用上述方法设置对话框的背景样式，然后设置自定义标题和内容视图(使用与SDK中相同的布局)。
我的包装:
import com.mypackage.R;
import android.app.AlertDialog;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomAlertDialogBuilder extends AlertDialog.Builder {
private final Context mContext;
private TextView mTitle;
private ImageView mIcon;
private TextView mMessage;
public CustomAlertDialogBuilder(Context context) {
super(context);
mContext = context;
View customTitle = View.inflate(mContext, R.layout.alert_dialog_title, null);
mTitle = (TextView) customTitle.findViewById(R.id.alertTitle);
mIcon = (ImageView) customTitle.findViewById(R.id.icon);
setCustomTitle(customTitle);
View customMessage = View.inflate(mContext, R.layout.alert_dialog_message, null);
mMessage = (TextView) customMessage.findViewById(R.id.message);
setView(customMessage);
}
@Override
public CustomAlertDialogBuilder setTitle(int textResId) {
mTitle.setText(textResId);
return this;
}
@Override
public CustomAlertDialogBuilder setTitle(CharSequence text) {
mTitle.setText(text);
return this;
}
@Override
public CustomAlertDialogBuilder setMessage(int textResId) {
mMessage.setText(textResId);
return this;
}
@Override
public CustomAlertDialogBuilder setMessage(CharSequence text) {
mMessage.setText(text);
return this;
}
@Override
public CustomAlertDialogBuilder setIcon(int drawableResId) {
mIcon.setImageResource(drawableResId);
return this;
}
@Override
public CustomAlertDialogBuilder setIcon(Drawable icon) {
mIcon.setImageDrawable(icon);
return this;
}
}
alert_dialog_title.xml(取自SDK)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<LinearLayout
android:id="@+id/title_template"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_vertical"
android:layout_marginTop="6dip"
android:layout_marginBottom="9dip"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip">
<ImageView android:id="@+id/icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:paddingTop="6dip"
android:paddingRight="10dip"
android:src="@drawable/ic_dialog_alert" />
<TextView android:id="@+id/alertTitle"
style="@style/?android:attr/textAppearanceLarge"
android:singleLine="true"
android:ellipsize="end"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<ImageView android:id="@+id/titleDivider"
android:layout_width="fill_parent"
android:layout_height="1dip"
android:scaleType="fitXY"
android:gravity="fill_horizontal"
android:src="@drawable/divider_horizontal_bright" />
</LinearLayout>
alert_dialog_message.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="2dip"
android:paddingBottom="12dip"
android:paddingLeft="14dip"
android:paddingRight="10dip">
<TextView android:id="@+id/message"
style="?android:attr/textAppearanceMedium"
android:textColor="@color/dark_grey"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dip" />
</ScrollView>
然后只需使用CustomAlertDialogBuilder而不是AlertDialog。Builder来创建对话框，并像往常一样调用setTitle和setMessage。
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>
我在博客上写过一篇关于如何用XML样式文件配置AlertDialog布局的文章。主要的问题是不同的布局参数需要不同的样式定义。下面是一个基于Holo Light平台19版AlertDialog样式的样板文件，该样式文件应该涵盖一系列标准布局方面，如文本大小和背景颜色。
<style name="AppBaseTheme" parent="android:Theme.Holo.Light">
...
<item name="android:alertDialogTheme">@style/MyAlertDialogTheme</item>
<item name="android:alertDialogStyle">@style/MyAlertDialogStyle</item>
...
</style>
<style name="MyBorderlessButton">
<!-- Set background drawable and text size of the buttons here -->
<item name="android:background">...</item>
<item name="android:textSize">...</item>
</style>
<style name="MyButtonBar">
<!-- Define a background for the button bar and a divider between the buttons here -->
<item name="android:divider">....</item>
<item name="android:dividerPadding">...</item>
<item name="android:showDividers">...</item>
<item name="android:background">...</item>
</style>
<style name="MyAlertDialogTitle">
<item name="android:maxLines">1</item>
<item name="android:scrollHorizontally">true</item>
</style>
<style name="MyAlertTextAppearance">
<!-- Set text size and color of title and message here -->
<item name="android:textSize"> ... </item>
<item name="android:textColor">...</item>
</style>
<style name="MyAlertDialogTheme">
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowTitleStyle">@style/MyAlertDialogTitle</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowMinWidthMajor">@android:dimen/dialog_min_width_major</item>
<item name="android:windowMinWidthMinor">@android:dimen/dialog_min_width_minor</item>
<item name="android:windowIsFloating">true</item>
<item name="android:textAppearanceMedium">@style/MyAlertTextAppearance</item>
<!-- If you don't want your own button bar style use
@android:style/Holo.Light.ButtonBar.AlertDialog
and
?android:attr/borderlessButtonStyle
instead of @style/MyButtonBar and @style/MyBorderlessButton -->
<item name="android:buttonBarStyle">@style/MyButtonBar</item>
<item name="android:buttonBarButtonStyle">@style/MyBorderlessButton</item>
</style>
<style name="MyAlertDialogStyle">
<!-- Define background colors of title, message, buttons, etc. here -->
<item name="android:fullDark">...</item>
<item name="android:topDark">...</item>
<item name="android:centerDark">...</item>
<item name="android:bottomDark">...</item>
<item name="android:fullBright">...</item>
<item name="android:topBright">...</item>
<item name="android:centerBright">...</item>
<item name="android:bottomBright">...</item>
<item name="android:bottomMedium">...</item>
<item name="android:centerMedium">...</item>
</style>
