使用材料和api>21时警报对话框失败

Question

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">

    <!-- android: annotation is not needed in <=v21 -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="colorButtonNormal">@color/buttonNormal</item>

</style>

values-v21文件夹中的样式是...

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="android:Theme.Material.NoActionBar">
        <!-- android: annotation is required in >=v21 -->
        <item name="android:colorPrimary">@color/colorPrimary</item>
        <item name="android:colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="android:colorAccent">@color/colorAccent</item>
        <item name="android:colorButtonNormal">@color/buttonNormal</item>

    </style>
</resources>

我的清单

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.rythmair.umwhat"
          xmlns:android="http://schemas.android.com/apk/res/android">

    <supports-screens
        android:anyDensity="true"
        android:requiresSmallestWidthDp="320"
        android:smallScreens="false"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <activity
            android:name=".FinalScore"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="landscape">
        </activity>
        <activity
            android:name=".GameBoard"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="landscape">
        </activity>
        <activity
            android:name=".GamePlayOptions"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="landscape">
        </activity>
        <activity
            android:name=".GameSetup"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="landscape">
        </activity>
        <activity
            android:name=".HelpScreen"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="landscape">
        </activity>
    </application>
</manifest>

当我试图使用AlergDialog时，我得到了一个错误，我从阅读中意识到需要AppCompat或Descenant

public void playAgainButton(View view){

        new AlertDialog.Builder(this)
                .setIcon(android.R.drawable.ic_dialog_info)
                .setTitle("Closing Activity")
                .setMessage("This will clear the board and return you to the Game Options screen.  Are you sure?")
                .setPositiveButton("Yes", new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        playAgain();
                        //finish();
                    }

                })
                .setNegativeButton("No", null)
                .show();
    }

Answer 1

发生这种情况是因为您使用的是style-21 XML格式的theme.Material...应该这样使用：

style.xml

<resources>
    <style name="AppTheme" parent="AppTheme.Base">

    </style>

    <!-- Base application theme. -->
    <style name="AppTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="colorControlHighlight">@color/colorHighlight</item>
        <item name="android:windowBackground">@android:color/white</item>
    </style>
</resources>

并将此代码放入style-21.xml文件中

<resources>
    <style name="AppTheme" parent="AppTheme.Base">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>
</resources>