小编the*_*end的帖子

我的项目使用Android NDK,我在构建时遇到上述错误.

• 我安装了最新的Java版本,Android NDK和Android SDK
• 使用Windows 8和Android Studio我在local.properties中添加了SDK和NDK

ndk.dir=C\:\\Users\\Jang\\AppData\\Local\\Android\\sdk\\ndk-bundle
sdk.dir=C\:\\Users\\Jang\\AppData\\Local\\Android\\sdk

这是我的build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "23.0.0"

    defaultConfig {
        applicationId "uk.digitalsquid.netspoofer"
        minSdkVersion 10
        targetSdkVersion 21
    }

    buildTypes {
        release {
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }

    sourceSets.main.jni.srcDirs = []
}

dependencies {
    compile 'com.android.support:support-v4:23.0.0'
    compile 'com.google.android.gms:play-services:7.8.0'
    compile 'org.jsoup:jsoup:1.8.3'
    compile project(':androidsupportv4preferencefragment')
}

tasks.withType(JavaCompile) {
    compileTask -> compileTask.dependsOn ndkLibsToJar, ndkBinariesToJar, ndkBinariesToJar16, ndkDataToJar
}

task ndkLibsToJar(type: Zip, dependsOn: 'ndkBuild', description: 'Create a JAR of the native libs') {
    destinationDir new File(buildDir, …

我正在开发一个Windows Phone应用程序.我有一个图像.这是它的XAML代码:

<Image x:Name="imageclock" Grid.Row="1" 
        Source="Image/Myimage.png" Height="240" Width="240"
        />

我想用这段代码更改image.source:

private void ClickonBtn(object sender, EventArgs e)
    {
            BitmapImage bm = new BitmapImage(new Uri("Image/Darktheme.png", UriKind.RelativeOrAbsolute));
            imageclock.Source = bm;
    }

但是当我遵守时,imageclock.Source = Null,这是错误:

Newappver1.DLL中发生了'System.NullReferenceException'类型的异常,但未在用户代码中处理

我在圆圈内有一个点,在圆圈外有另一个点.我想找到线与圆相交的点.我怎么能在Windows Phone 8中这样做.请给我任何想法.