如何让Android Spinner Text更新?

sg24os4d  于 2023-04-18  发布在  Android
关注(0)|答案(6)|浏览(193)

我的Activity中有一个微调器。

顶部的旋转栏用作标题,然后在其下方有一个导航栏,在下半部分有一个片段容器。
微调器包含传递给它的所有练习的列表。

单击微调器下拉列表中的一个项目后,我希望微调器文本得到更新,但没有发生任何更改...
我收到以下消息:
W/e.exerciseappv: Accessing hidden field Landroid/widget/AbsListView;->mIsChildViewEnabled:Z (greylist, reflection, allowed)
D/OpenGLRenderer: endAllActiveAnimators on 0xc6707410 (DropDownListView) with handle 0xc6e4a5f0
我如何才能让我的基本微调工作(或者有人有一个变通办法)?

活动

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProviders;
import com.example.exerciseappv5.Fragments.ExerciseGraphFragment;
import com.example.exerciseappv5.Fragments.RecordExerciseFragment;
import com.example.exerciseappv5.Fragments.RecordExerciseHistoryFragment;
import com.example.exerciseappv5.ViewModels.ChildExerciseViewModel;
import com.google.android.material.bottomnavigation.BottomNavigationView;

import java.util.ArrayList;
import java.util.List;

public class RecordExerciseActivity2 extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

    List<String> allChildExerciseNames = new ArrayList<>();
    public static final String PARENT_EXERCISE_ID = "-999";
    public static final String EXTRA_DATE = "com.example.exerciseappv4.EXTRA_DATE";
    public static final String EXTRA_WEEK_DATES = "1";
    public static String EXTRA_JUNCTIONID = "EXERCISE_JUNCTION_ID";
    int parentExerciseID;
    private ChildExerciseViewModel childExerciseViewModel;
    String firstExerciseName;
    String selectedExercise;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_record_exercise);

        getSupportActionBar().hide();

        Intent intent = getIntent();
        if (intent.hasExtra(PARENT_EXERCISE_ID)) {
            parentExerciseID = Integer.parseInt(intent.getStringExtra(PARENT_EXERCISE_ID));
        }

        BottomNavigationView bottomNav = findViewById(R.id.top_navigation);
        bottomNav.setOnNavigationItemSelectedListener(navListener);

        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container2, new RecordExerciseFragment()).commit();

        //getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_back);
        childExerciseViewModel = ViewModelProviders.of(this).get(ChildExerciseViewModel.class);
        childExerciseViewModel.getChildExerciseNameFromParentID(parentExerciseID).observe(this, this::setChildExerciseName);
        childExerciseViewModel.getAllchildExercisesFromParentID(parentExerciseID).observe(this, this::getAllChildExercisesFromParentID);

        Spinner spinner =  findViewById(R.id.spinner1);
        ArrayList<String> spinnerStringArray = new ArrayList<>();
        //Add your data to your array
        spinnerStringArray.addAll(allChildExerciseNames);
        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
               android.R.layout.simple_spinner_dropdown_item, allChildExerciseNames);
        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(spinnerAdapter);
        spinner.setOnItemSelectedListener(this);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        selectedExercise = parent.getItemAtPosition(position).toString();
        Toast.makeText(parent.getContext(), selectedExercise, Toast.LENGTH_SHORT).show();
        Log.i("spinner item clicked ", selectedExercise);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }

    private BottomNavigationView.OnNavigationItemSelectedListener navListener =
            new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                    Fragment selectedFragment = null;

                    switch (item.getItemId()) {
                        case R.id.nav_track:
                            selectedFragment = new RecordExerciseFragment();
                            break;
                        case R.id.nav_history:
                            selectedFragment = new RecordExerciseHistoryFragment();
                            break;
                        case R.id.nav_exercise_list:
                            selectedFragment = new ExerciseGraphFragment();
                            break;
                    }
                    getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container2, selectedFragment).commit();
                    return true;
                }
            };

    private void setChildExerciseName(String childExerciseName) {
        firstExerciseName = childExerciseName;
    }

    public String getSelectedExercise() {
        return selectedExercise;
    }

    private void getAllChildExercisesFromParentID(List<String> allChildExercisesReceived) {
        allChildExerciseNames.addAll(allChildExercisesReceived);
    }
}

活动布局XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <View style="@style/Full_Divider"
        android:id="@+id/divider9"
        android:layout_width="wrap_content"
        android:layout_height="1dp"
        android:layout_below="@+id/spinner1"/>

    <View style="@style/Full_Divider"
        android:id="@+id/divider10"
        android:layout_width="wrap_content"
        android:layout_height="1dp"
        android:layout_below="@+id/top_navigation" />

    <FrameLayout
        android:id="@+id/fragment_container2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/divider10" />

    <androidx.appcompat.widget.AppCompatSpinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"

        android:layout_marginEnd="1dp"
        android:layout_marginRight="1dp"
        android:gravity="right"
        android:padding="8dp" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/top_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/spinner1"
        app:itemTextColor="#ffffff"
        app:itemIconTint="#ffffff"
        app:menu="@menu/top_navigation"
        android:background="#292929" />

</RelativeLayout>

build.Gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.example.exerciseappv5"
        minSdkVersion 16
        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'
        }
    }
    compileOptions {
        sourceCompatibility = 1.8
        targetCompatibility = 1.8

        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'com.github.barteksc:android-pdf-viewer:2.8.2'

    def lifecycle_version = "1.1.1"
    def room_version = "1.1.1"

    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.1.0-rc01'
    implementation 'androidx.cardview:cardview:1.0.0'



    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 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'android.arch.lifecycle:extensions:1.0.0-alpha1'
    annotationProcessor 'android.arch.lifecycle:compiler:1.1.1'

    implementation 'android.arch.persistence.room:runtime:1.0.0-alpha1'
    annotationProcessor 'android.arch.persistence.room:compiler:1.0.0-alpha1'
}
3vpjnl9f

3vpjnl9f1#

目前,您正在onCreate()中执行Spinner的整个设置:你用一个(可能是空的)数据列表示例化适配器并调用spinner.setAdapter(spinnerAdapter);
之后,您只需更改数据列表:每次调用getAllChildExercisesFromParentID(List<String>)时,您都要在传入适配器的数据列表中添加几个String。但您从未在适配器上调用notifyDatasetChanged(),我认为这就是问题的根源。
运行时不会抛出Exception(如果我没记错的话,应该是ListView而不是Spinner)--你只会看到一个空的(!)Spinner和一个非空的下拉列表,选择一个项目没有任何效果。
因此,要修复您的问题,您可以在调用getAllChildExercisesFromParentID(List<String>)时为Spinner重新创建一个新的适配器。在这种情况下,您需要将Spinner作为Activity的字段,以便可以通过以下方法访问它:

private Spinner spinner;

onCreate()中初始化它,但不要设置适配器:

spinner =  findViewById(R.id.spinner1);
spinner.setOnItemSelectedListener(this);

在收到数据时为Spinner创建适配器的新示例:

private void getAllChildExercisesFromParentID(List<String> allChildExercisesReceived){
    // maybe removing old data is a good idea?
    allChildExerciseNames.clear();

    allChildExerciseNames.addAll(allChildExercisesReceived);
 
    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_dropdown_item, allChildExerciseNames);
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(spinnerAdapter);

}

或者让Activity有一个字段private ArrayAdapter<String> spinnerAdapter;
onCreate()中完全初始化Spinner

Spinner spinner =  findViewById(R.id.spinner1);
spinnerAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_dropdown_item, allChildExerciseNames);
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(spinnerAdapter);

spinner.setOnItemSelectedListener(this);

...并在收到数据时更新数据列表(以及相应的适配器):

private void getAllChildExercisesFromParentID(List<String> allChildExercisesReceived){
    // remove old data 
    allChildExerciseNames.clear();

    allChildExerciseNames.addAll(allChildExercisesReceived);
    spinnerAdapter.notifyDataSetChanged();
}

我更喜欢第二个版本,因为它不需要在每次刷新数据时都创建一个新对象-它可以帮助提高性能(但在这种情况下,对现代设备的影响几乎不明显,所以它更多的是代码风格的问题)
顺便说一句,你当然可以也应该在你的布局中保留Spinner--AppCompatSpinner只是我试图摆脱奇怪的“Landroid/widget/AbsListView...”消息,它恰好在Spinner问题出现的同时弹出。

bvn4nwqk

bvn4nwqk2#

onItemSelected中,你可以在log语句之后做一些类似的事情,检查视图是否是spinner类型,如果是,则将选择设置为你点击的位置的索引。

if(view instanceof Spinner) {
  (Spinner)view.setSelection(position);
}

如果你的onItemSelected只被你的微调器使用,你可以从onItemSelected中取出所有代码,直接为你的微调器设置onClickListener,这样就不需要instanceof检查了。

f1tvaqid

f1tvaqid3#


I复制并粘贴您的活动和XML从上面编译和运行在像素3xl模拟器,它是为我工作。
注意-我只评论和更新了一些我没有的部分,比如框架,模型和样式(XML)。请检查是否微调器的样式是问题所在。
您可以提供一个自定义的UI微调如下。

ArrayAdapter<String> spinnerGenderAdapter = new ArrayAdapter<String>(getActivity(),
            R.layout.spinner_item, sp_gender);
    spinnerGenderAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    mGenderSpinner.setAdapter(spinnerGenderAdapter);
    mGenderSpinner.setSelection(0);

spinner_item.xml

'<?xml version="1.0" encoding="utf-8"?>

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tv_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:textColor="@color/somecolor"
android:textSize="16sp" />'

cgyqldqp

cgyqldqp4#

我能够在API 29中以编程方式重现您的场景。我相信这样您就可以获得默认的微调器行为。
为了重现您的场景,我覆盖了ArrayAdapter对象的默认getView()实现。(我使用自定义simple_spinner_item_custom布局进行了此操作,但它也应该适用于android.R.layout.simple_spinner_item):

ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
                R.layout.simple_spinner_item_custom, spinnerStringArray) {
            @NonNull
            @Override
            public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
                View view = super.getView(position, convertView, parent);
                // get a reference to the textview from the item layout
                TextView tv = view.findViewById(R.id.custom_text_1);
                // I manually set the text to empty like this to reproduce :D
                // tv.setText("");
                // the fix I would like to suggest
                tv.setText(spinnerStringArray[position]);
                return view;
            }
        };

我还相信你现在可以在这个view对象中设置onClickListener()来获得类似onItemSelectedListener()的行为。

eaf3rand

eaf3rand5#

它应该开箱即用。我认为模拟器有问题,或者项目中的旧依赖。在真实的设备上也验证。可能有替代方案,我也不喜欢!

For ex.

// .....
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    selectedExercise = parent.getItemAtPosition(position).toString();
    Toast.makeText(parent.getContext(), selectedExercise, Toast.LENGTH_SHORT).show();
    Log.i("spinner item clicked ", selectedExercise);
    updateAdapter(selectedExercise)
}

// ....
private void updateAdapter(@Nullable final String selected) {
   final List<String> array = new ArrayList<>(allChildExerciseNames);

   if (!TextUtils.isEmpty(selected)) {
       array.remove(selected)
       array.set(0, selected)
}
    
   final Spinner spinner =  findViewById(R.id.spinner1);
   final ArrayAdapter<String> spinnerAdapter = new 
         ArrayAdapter<String>(this,  android.R.layout.simple_spinner_dropdown_item, array);
   

   spinnerAdapter.setDropDownViewResource(
       android.R.layout.simple_spinner_dropdown_item);
   spinner.setAdapter(spinnerAdapter, array);
   spinner.setOnItemSelectedListener(this);
}
//...

Ps.你可以通过将它们放置为Activity类状态来摆脱上面的一些变量。这个解决方案是根据你的请求添加的,作为替代方案。至少你可以使用它,直到我们找出真实的的问题。

lndjwyie

lndjwyie6#

最简单的方法是创建一个新的String数组,创建一个新的SpinnerAdapter并将setAdapter(替换旧的)添加到微调器。

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