小编Ant*_*wan的帖子

Java中同步方法和同步块的主要思想是什么？

我们为什么要使用它们？

示例代码会很好.我已经阅读了有关同步方法的Java文档,但我没有理解.

这是Java文档代码

public class SynchronizedCounter {
    private int c = 0;

    public synchronized void increment() {
        c++;
    }

    public synchronized void decrement() {
        c--;
    }

    public synchronized int value() {
        return c;
    }
}

我已经在我的应用程序中设置了所有东西,我google analytics V4 可以看到它,但是当我在移动视图中进行实时概述时,我没有看到任何活动用户

这是我的追踪者

 <?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools"
tools:ignore="TypographyDashes">
  <integer name="ga_sessionTimeout">300</integer>

    <!-- Enable automatic Activity measurement -->
    <bool name="ga_autoActivityTracking">true</bool>
    <!-- The screen names that will appear in reports -->
    <screenName name="info.lifepast.MainActivity">MainActivity</screenName>

    <!--  The following value should be replaced with correct property id. -->
    <string name="ga_trackingId">UA-xxx-3</string>
</resources>

而应用程序类是

public class Analytics extends Application {
private static final String PROPERTY_ID = "UA-xxxxx-3";
  public enum TrackerName {
        APP_TRACKER, // Tracker used only in this app.
        GLOBAL_TRACKER, // Tracker used by …

我正在尝试签署我的应用程序以进行发布并且它正确构建,但我想启用Proguard我收到以下错误

Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease

我的gradle文件

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    lintOptions {
        disable 'InvalidPackage'
    }
    packagingOptions {
        exclude 'META-INF/services/javax.annotation.processing.Processor'
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }
}

repositories {
    mavenCentral()
    jcenter()
    maven {
        url 'https://esri.bintray.com/arcgis'
    }
}
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile project(':StickyListHeaders')
    compile files('libs/org.apache.commons.io.jar')
    compile files('libs/json-20140107.jar')
    compile project(':ParallaxEverywhere')
    compile files('libs/nineoldandroids-2.4.0.jar') …

long并且double读取和写入操作不是原子的,因为它们的大小超过了cpu字大小.

那么long,double如果我有64位机器,我可以获得原子读写操作吗？

嘿,我正在使用pubnub服务为我的Titanium App添加聊天功能,但我想知道是否有办法获取未读消息的数量.
在api引用上没有关于此的信息

我试图在历史中保存消息的数量,然后重新加载新的历史记录并计算差异,但它是如此愚蠢和复杂的解决方案,任何人都知道如何实现这一目标？谢谢

嘿我正在创建小型相机应用程序我已经实现了所有的东西,但我有一个问题,即将NV21字节数组转换为jpeg格式
我发现很多方法,但所有这些甚至不工作或在某些设备上工作
首先 我尝试了这个片段和它适用于Xperia z2 5.2但适用于galaxy s4 4.4.4

bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);

这种方式也可以在同一台设备上运行而另一台则失败

 int pich = camera.getParameters().getPreviewSize().height;
        int picw = camera.getParameters().getPreviewSize().width;
        int[] pix = new int[picw * pich];
        bitmap.getPixels(pix, 0, picw, 0, 0, picw, pich);
                    //  int R, G, B, Y;
                    for (int y = 0; y < pich; y++) {
                        for (int x = 0; x < picw; x++) {
                            int index = y * picw + x;
                          int R = (pix[index] >> 16) & 0xff; 
                         int G …

我将列表视图转换为布局中的回收器视图后,我收到此错误,我将适配器从基本适配器更改为回收器视图适配器

Error:Execution failed for task ':app:transformClassesWithDexForDebug'.

com.android.build.api.transform.TransformException:com.android.ide.common.process.ProcessException:org.gradle.process.internal.ExecException:处理'命令'/Library/Java/JavaVirtualMachines/jdk1.7.0_71. jdk/Contents/Home/bin/java''以非零退出值1结束

这就是我在日志中得到的东西

    14:38:32.582 [DEBUG] [org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter] Finished executing task ':app:transformClassesWithDexForDebug'
14:38:32.582 [LIFECYCLE] [class org.gradle.TaskExecutionLogger] :app:transformClassesWithDexForDebug FAILED
14:38:32.584 [INFO] [org.gradle.execution.taskgraph.AbstractTaskPlanExecutor] :app:transformClassesWithDexForDebug (Thread[main,5,main]) completed. Took 41.484 secs.
14:38:32.584 [DEBUG] [org.gradle.execution.taskgraph.AbstractTaskPlanExecutor] Task worker [Thread[main,5,main]] finished, busy: 2 mins 9.57 secs, idle: 0.244 secs
14:38:32.598 [ERROR] [org.gradle.BuildExceptionReporter] 
14:38:32.599 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception.
14:38:32.600 [ERROR] [org.gradle.BuildExceptionReporter] 
14:38:32.600 [ERROR] [org.gradle.BuildExceptionReporter] * What went wrong:
14:38:32.600 [ERROR] [org.gradle.BuildExceptionReporter] Execution failed for task ':app:transformClassesWithDexForDebug'.
14:38:32.600 [ERROR] [org.gradle.BuildExceptionReporter] > …

我正在尝试在Webview上应用展开折叠功能基于其内容高度,但我总是得到错误的值这是我的代码

public class MesuredHeightWebView extends WebView {
    public MesuredHeightWebView(Context context) {
        super(context);
    }

    public MesuredHeightWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MesuredHeightWebView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }



    @Override
    public void invalidate() {
        super.invalidate();

        if (getContentHeight() > 0) {
            // WebView has displayed some content and is scrollable.
            if(listener!=null)
                listener.updateContentHeight(getContentHeight());
        }
    }



    WebViewContentHeight listener;

    public void setChangeContentListener(WebViewContentHeight listener) {
        this.listener = listener;
    }
}

然后在片段中我试图获得内容高度

 webView.setWebChromeClient(new WebChromeClient(){
        @Override
        public void onProgressChanged(WebView view, int newProgress) …

我正在使用此主题生成器为我的Titanium应用程序创建自定义主题.但是当我运行我的应用程序时它崩溃了,我的日志说我需要appCompact即使我为sdk> sdk 11设置主题.

我的目标Android版本是API 19,而min SDK版本是API14,所以我想知道为什么我需要appCompact.

这就是我的日志所说的:

 [ERROR] :  TiApplication: (main) [512,512] Sending event: exception on thread: main msg:java.lang.RuntimeException: Unable to start activity ComponentInfo{a.s/org.appcelerator.titanium.TiActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.; Titanium 3.4.0,2014/09/25 16:42,b54c467
[ERROR] :  TiApplication: java.lang.RuntimeException: Unable to start activity ComponentInfo{a.s/org.appcelerator.titanium.TiActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
[ERROR] :  TiApplication:   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
[ERROR] :  TiApplication:   at android.app.ActivityThread.handleLaunchActivity(Activ
[ERROR] : …

由于未知原因,genymotion虚拟设备无法获取IP地址,虚拟机DHCP尚未为虚拟设备分配IP地址我看到许多问题与我的相同,但他们没有修复它

和网络IP