小编Das*_*uni的帖子

Alt + Enter导入工作正常,直到我更新Android Studio,我的版本现在是2.3.3

作为这个截图,我不能按下alt + enter,知道我已经在其他程序上测试了它们并且它们正常工作

我正在尝试获取Cloud Firestore上存在的CollectionReference计数,我试图通过以下方式获取它:

FirebaseFirestore db = FirebaseFirestore.getInstance();
    final CollectionReference postsCollection = db.collection("Posts");

    final TaskCompletionSource<Integer> source = new TaskCompletionSource<>();
    new Thread(new Runnable() {
        @Override
        public void run() {
            int fromWhereToStart = postsCollection.get().getResult().size();
            source.setResult(fromWhereToStart);
        }
    }).start();

    Task<Integer> task = source.getTask();
    task.addOnCompleteListener(new OnCompleteListener<Integer>() {
        @Override
        public void onComplete(@NonNull Task<Integer> task) {
            Log.e("Z_fromWhereToStart", "= " + task.getResult());
        }
    });

但不幸的是,我得到了:

java.lang.IllegalStateException: Task is not yet complete

还有另一种方法来计算另一种修复方法IllegalStateException吗？

我试图"adb tcpip 5555"在cmd中执行命令并获取输出以在另一个语句中使用它.

此adb代码应该给出,error: no devices/emulators found但缓冲区仍为空.

FILE* lsofFile_p = popen("c:\\adb tcpip 5555" ,"r");
char* line_p = fgets(buffer, sizeof(buffer), lsofFile_p);
printf("\n***\nbuffer = %s***\n\n", buffer);
pclose(lsofFile_p);
printf("\n***\nbuffer = %s***\n\n", buffer);

我已经从Android Studio Templets创建了一个带滚动活动的应用来测试我的主应用程序的编码是否会影响该行为,所以我只是添加到代码中:

<item name="android:windowTranslucentNavigation" tools:targetApi="kitkat">true</item>

这显示了导航栏后面的Snackbar作为这个截图(PS:我正在使用Xstane在我的手机上重新设计我的导航栏,但我认为这不会影响代码因为我尝试了TranslucentNavigation与Snackbar没有CollapsingToolbarLayout并且效果很好)

该应用程序正在支持

• windowTranslucentNavigation
• 小吃店
• CollapsingToolbarLayout
• FloatingActionButton

这是主要的xml的代码

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".testscanbarwithcollapsing.ScrollingActivity"
>

<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar"
    android:layout_width="match_parent"
    android:layout_height="@dimen/app_bar_height"
    android:fitsSystemWindows="true"
    android:theme="@style/AppTheme.AppBarOverlay"
    >

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        app:contentScrim="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        >

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/AppTheme.PopupOverlay"
            />

    </android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_scrolling"/>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="@dimen/fab_margin"
    app:layout_anchor="@id/app_bar"
    app:layout_anchorGravity="bottom|end"
    app:srcCompat="@android:drawable/ic_dialog_email"
    />

更新:这是显示Snackbar的FloatingButton的onClick代码(此代码位于主要活动的onCreate中)

fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            fabProgressCircle.show();
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show(); …

我已将我的app.Gradle更新building tools 25.0.2为其已编译的库,如图所示

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "....."
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions {  //to avoid the Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'. > com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/LICENSE    File1: C:\Users\dasse\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-databind\2.2.2\3c8f6018eaa72d43b261181e801e6f8676c16ef6\jackson-databind-2.2.2.jar  File2: C:\Users\dasse\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-core\2.2.2\d20be6a5ddd6f8cfd36ebf6dea329873a1c41f1b\jackson-core-2.2.2.jar  File3: C:\Users\dasse\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-annotations\2.2.2\285cb9c666f0f0f3dd8a1be04e1f457eb7b15113\jackson-annotations-2.2.2.jar
        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 …