小编Deb*_*jan的帖子

随着 android N 最近的变化，我不得不升级我的代码以使用 FileProvider 使用相机/文件管理器获取图像/文件。该代码在模拟器（genymotion）中运行良好，但在 Moto G4 plus 中抛出 IO 异常。

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){
                try {
                    ParcelFileDescriptor fcd = getContentResolver().openFileDescriptor(uriOrig,"r");// uriOrig is the uri returned from camera
                    if(fcd != null) {
                        InputStream inputStream = new FileInputStream(fcd.getFileDescriptor());
                        uploadCall =RestService.getInstance().uploadFile(mimeType, name, size,
                                inputStream, defaultResponseCallback);
                    }

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }

这里是上传文件的方法。

public Call<Attachment> uploadFile(final String mimeType, final String name, final long length,final InputStream is, final Callback<Attachment> callback) {
final int byteCount = 8192;
    if (length > 0) { …

这是我的build.gradle(app)

buildscript {
    repositories {
        maven { url 'https://maven.fabric.io/public' }
    }

    dependencies {
        classpath 'io.fabric.tools:gradle:1.+'
    }
}
apply plugin: 'com.android.application'
apply plugin: 'io.fabric'

repositories {
    maven { url 'https://maven.fabric.io/public' }
}


android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
    defaultConfig {
        applicationId "com.my.app"
        minSdkVersion 16
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding {
        enabled = true
    }

    packagingOptions {
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
    }
}

ant.importBuild 'assets.xml'
preBuild.dependsOn(list, …

要在约束布局中为一组视图设置背景，想法是创建一个视图项并将其约束到极端视图的边界。但是如果一个组仅依赖于右侧约束，则无法向左侧添加边距，因此可能设置背景的视图组没有左填充，

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <data>
        <import type="android.view.View"/>
        <variable
            name="audio"
            type="example.model.observables.AttachmentObservableModel"/>
    </data>

    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:background="@drawable/selector_chat_row"
        >

        <include
            android:id="@+id/message_preview_layout"
            layout="@layout/reply_preview_layout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:minWidth="160dp"
            android:layout_marginLeft="10dp"
            app:layout_constraintRight_toLeftOf="@+id/guideline"

            app:layout_constraintTop_toTopOf="parent" />

        <android.support.constraint.Barrier
            android:id="@+id/left_barrier"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:barrierDirection="left"
            app:constraint_referenced_ids="play_pause,message_preview_layout" />

        <View
            android:id="@+id/view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:background="@drawable/chat_me_background"
            app:layout_constraintBottom_toBottomOf="@+id/play_pause"
            app:layout_constraintLeft_toLeftOf="@+id/left_barrier"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageButton
            android:id="@+id/play_pause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginBottom="10dp"
            android:background="@null"
            android:enabled="@{!(audio.filePath == null || audio.filePath.isEmpty())}"
            android:onClick="@{() -> audio.playing? audio.onPausePressed(): audio.onPlayPressed()}"
            android:paddingLeft="10dp"
            android:paddingBottom="10dp"
            android:src="@{audio.playing? @drawable/ic_pause_circle_filled: @drawable/ic_play_arrow}"
            app:layout_constraintRight_toLeftOf="@+id/seekbar"
            app:layout_constraintTop_toBottomOf="@+id/message_preview_layout" />

        <android.support.v7.widget.AppCompatSeekBar
            android:id="@+id/seekbar"
            android:layout_width="170dp" …

在Kotlin反复面对这个问题

fun test(){
        compute { foo -> Log.e("kotlin issue", "solved") } // This line is //showing error
    }

    fun compute(body: (foo:String) -> Unit?){
        body.invoke("problem solved")
    } 

我在Studio中收到错误.这是一个截图.