DanVik's questions

尝试掌握 Moxy 2.1.2

因错误而崩溃：

java.lang.BootstrapMethodError: Exception from call site #0 bootstrap method
    at moxy.MvpDelegate.<clinit>(MvpDelegate.java:37)
    at moxy.MvpAppCompatFragment.getMvpDelegate(MvpAppCompatFragment.java:108)
    at ru.example.stat.fragments.EventFragment.<init>(EventFragment.kt:36)
    at ru.example.stat.actyvities.MainActivity.onCreate(MainActivity.kt:58)
    at android.app.Activity.performCreate(Activity.java:7224)
    at android.app.Activity.performCreate(Activity.java:7213)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2926)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:201)
    at android.app.ActivityThread.main(ActivityThread.java:6810)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)

我知道问题出在片段中

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import moxy.MvpAppCompatFragment
import moxy.ktx.moxyPresenter
import ru.example.stat.R
import ru.example.stat.presenters.EventPresenter
import ru.example.stat.views.EventView


class EventFragment : MvpAppCompatFragment(R.layout.fragment_events), EventView{

    private val eventPresenter by moxyPresenter { EventPresenter() }


    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? =
        inflater.inflate(R.layout.fragment_events, container, false)
}

我做错了什么，可能是什么问题？

在 MainActivity onCreate：

 override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val navView: BottomNavigationView = findViewById(R.id.nav_view)


    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED)
    navView.setOnNavigationItemSelectedListener(onNavigationItemSelectedListener)
    val fragment = EventFragment()
    addFragment(fragment)
}

private fun addFragment(fragment: Fragment){
    supportFragmentManager.beginTransaction().replace(R.id.container, fragment, fragment.javaClass.getSimpleName())
        .commit()
}

毕业典礼

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android-extensions'



android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "ru.example.stat"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    kotlinOptions {
        jvmTarget = "1.8"
    }
}


dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'com.google.android.material:material:1.1.0'

    implementation 'androidx.appcompat:appcompat:1.0.0'
    implementation 'com.google.android.material:material:1.0.0'

    //MOXY

    def moxyVersion = "2.1.2"
    implementation "com.github.moxy-community:moxy:$moxyVersion"
    kapt "com.github.moxy-community:moxy-compiler:$moxyVersion"
    implementation "com.github.moxy-community:moxy-android:$moxyVersion"
    implementation "com.github.moxy-community:moxy-androidx:$moxyVersion"
    implementation "com.github.moxy-community:moxy-material:$moxyVersion"
    implementation "com.github.moxy-community:moxy-ktx:$moxyVersion"

    //GraphView
    implementation 'com.jjoe64:graphview:4.2.2'


    testImplementation 'junit:junit:4.12'

    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    //room
    implementation 'androidx.room:room-runtime:2.2.5'
    kapt 'androidx.room:room-compiler:2.2.5'

    def room_version = "2.2.5"
    implementation "androidx.room:room-runtime:$room_version"
    kapt "androidx.room:room-compiler:$room_version"
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
    implementation "androidx.room:room-ktx:$room_version"

    //Coroutines
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.4"
}

使用 BottomNavigationView 时片段的正确显示存在问题。片段数据位于底部导航视图下。我认为，在这里，您很可能需要在活动中做点什么。

activity_main.xml

  <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
        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:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".actyvities.MainActivity">

    <android.support.design.widget.BottomNavigationView
            android:id="@+id/nav_view"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="0dp"
            android:layout_marginStart="0dp"
            app:labelVisibilityMode="labeled"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:menu="@menu/bottom_nav_menu"/>

</android.support.constraint.ConstraintLayout>

MainActivity.kt

class MainActivity : AppCompatActivity() {

    private val onNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
        when (item.itemId) {
            R.id.navigation_event -> {
                val fragment =
                    EventFragment()
                addFragment(fragment)
                return@OnNavigationItemSelectedListener true

            }
            R.id.navigation_person -> {
                val fragment =
                    PersonFragment()
                addFragment(fragment)
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_reports -> {
                val fragment =
                    ReportFragment()
                addFragment(fragment)
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_settings -> {
                val fragment =
                    SettingsFragment()
                addFragment(fragment)
                return@OnNavigationItemSelectedListener true
            }
        }
        false
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val navView: BottomNavigationView = findViewById(R.id.nav_view)


        navView.setOnNavigationItemSelectedListener(onNavigationItemSelectedListener)
        val fragment = EventFragment()
        addFragment(fragment)




    }
   private fun addFragment(fragment: Fragment){
        supportFragmentManager.beginTransaction().replace(R.id.container, fragment, fragment.javaClass.getSimpleName())
            .commit()
    }

其中一个片段：

class PersonFragment: Fragment() {
    val list = ArrayList<Person>()
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val myView = inflater.inflate(R.layout.fragment_persons,container,false)
        loadPersonList()
        showPersonList(myView)
        return myView
    }
    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        }


    fun showPersonList(view: View){
        val  myListView = view.findViewById<ListView>(R.id.lvPerson)
        myListView.adapter = PersonAdapter(
            layoutInflater.context,
            listOfPerson = list
        )

    }

    fun loadPersonList(){
        list.add(Person("Иванов Иван"))
        list.add(Person("Петров Петр"))
        list.add(Person("Сергеев Сергей"))
        list.add(Person("Иванов Иван"))
        list.add(Person("Петров Петр"))
        list.add(Person("Сергеев Сергей"))
        list.add(Person("Иванов Иван"))
        list.add(Person("Петров Петр"))
        list.add(Person("Сергеев Сергей"))
        list.add(Person("Иванов Иван"))
        list.add(Person("Петров Петр"))
        list.add(Person("Сергеев Сергей"))
        list.add(Person("Иванов Иван"))
        list.add(Person("Петров Петр"))
        list.add(Person("Сергеев Сергей"))
    }

fragment_persons.xml

<?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">

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/gray"
            android:orientation="vertical">

        <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/white"
                android:orientation="horizontal"
                android:padding="3dp">

            <TextView
                    android:id="@+id/textView3"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="@string/team"
                    android:textSize="18sp"/>

            <Spinner
                    android:id="@+id/spinner"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="32"/>
        </LinearLayout>

        <ListView
                android:id="@+id/lvPerson"
                android:layout_width="match_parent"
                android:layout_height="match_parent"/>

    </LinearLayout>
    <android.support.design.widget.FloatingActionButton
            android:id="@+id/floatingActionButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:clickable="true"
            app:backgroundTint="@color/colorPrimary"
            android:layout_marginBottom="50dp"
            app:fabSize="normal"
            app:srcCompat="@drawable/ic_person_add_black_24dp"/>

</android.support.design.widget.CoordinatorLayout>

在用于测试的片段中，我放入了一个列表，当显示时，列表和 fab 中的人员会转到 BottomNavigationView。怎么修？提前致谢。

我创建了一个 svg 文件，我需要通过邮件发送它，但我做错了：

File file=new File(getFilesDir(), FILENAME);
    Intent email = new Intent(Intent.ACTION_SEND);

   if (file.exists()) {
       email.putExtra(Intent.EXTRA_EMAIL, new String[]{etMail.getText().toString()});
       email.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+file));
       email.putExtra(Intent.EXTRA_SUBJECT, "Subject");
       email.putExtra(Intent.EXTRA_TEXT, "text");
       email.setType("message/rfc822");
      // email.setType("*/*");
       startActivity(Intent.createChooser(email, "Выберите email клиент :"));}

应用程序逐行崩溃

 email.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+file));

有错误：

android.os.FileUriExposedException: file:///data/user/0/ru.test/files/file.svg 通过 ClipData.Item.getUri() 暴露在应用程序之外

我创建一个文件：

try {
        // отрываем поток для записи
        OutputStreamWriter writer = new OutputStreamWriter(openFileOutput(FILENAME, MODE_PRIVATE));
        BufferedWriter bw = new BufferedWriter(writer);
        // пишем данные
        bw.write("Содержимое файла");
        // закрываем поток
        bw.close();
     } catch (FileNotFoundException e) {
        e.printStackTrace();
     } catch (IOException e) {
        e.printStackTrace();
     }

然后我需要通过邮件发送它 我收到文件并检查可用性

    File file = new File(FILENAME);
    if(file.exists()) {
        ...
    }

但是由于某种原因，他没有看到它（if 条件没有通过），尽管当我通过流加载它时，一切都很好。

try {
        // открываем поток для чтения
        BufferedReader br = new BufferedReader(new InputStreamReader(
                openFileInput(FILENAME)));
        String str = "";
        // читаем содержимое
        while ((str = br.readLine()) != null) {
            Log.d(LOG_TAG, str);

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

我认为问题出在文件（文件名）中。告诉一个新手。