Question

我是Android编程新手。有人可以帮我吗？我正在测试如何使用arrayadapter在列表视图中显示图像和字符串。我甚至用不同的方法尝试了基本适配器，但同样的问题，应用程序崩溃，永远不会运行。

以下是 MainActivity.java

的代码

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;


public class MainActivity extends Activity {
    ListView l;
    int [] Images = {R.drawable.img1,R.drawable.img2, R.drawable.img3, R.drawable.img4, R.drawable.img5, R.drawable.img6, R.drawable.img7, R.drawable.img8, R.drawable.img9, R.drawable.img10};
    String [] Titles;
    String [] Description;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Resources resources=getResources();
        Titles = resources.getStringArray(R.array.Title);
        Description = resources.getStringArray(R.array.Description);
        l = findViewById(R.id.listView);
        PopulateRows arrayAdapter = new PopulateRows(this, Titles,Images, Description);
        l.setAdapter(arrayAdapter);

    }
    class PopulateRows extends ArrayAdapter<String>{
        Context context;
        int [] Images;
        String[] Titles;
        String [] Description;
        PopulateRows(Context context, String[] Titles, int[] imgs, String[] Description){
            super(context,R.layout.custom_layout, R.id.textView, Titles);
            this.context=context;
            this.Images=imgs;
            this.Titles=Titles;
            this.Description=Description;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(LAYOUT_INFLATER_SERVICE);
            View row = inflater.inflate(R.layout.custom_layout,parent,false);

            ImageView imageView = row.findViewById(R.id.imageView);
            TextView textView =  row.findViewById(R.id.textView);
            TextView textView1 = row.findViewById(R.id.textView1);

            imageView.setImageResource(Images[position]);
            textView.setText(Titles[position]);
            textView1.setText(Description[position]);
            return row;
        }
    }
}

这是 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.name.mypackage.MainActivity">

    <ListView
        android:id="@+id/listView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ListView>

</android.support.constraint.ConstraintLayout>

这里又是 custom_layout.xml 文件

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

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@mipmap/ic_launcher"
        android:layout_marginStart="28dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="29dp" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="49dp"
        android:text="TextView"
        android:layout_alignTop="@+id/imageView"
        android:layout_toEndOf="@+id/imageView" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/imageView"
        android:layout_alignStart="@+id/textView"
        android:text="TextView" />

</RelativeLayout>

当我运行此代码时，我总是会收到以下错误并且应用程序崩溃：

---------崩溃开始09-12 10：11：44.925 4706-4706 / com.example.name.mypackageE / AndroidRuntime：FATAL 例外：主要处理：com.example.name.mypackage，PID：4706 java.lang.OutOfMemoryError：无法分配286654476字节分配4896858个空闲字节和248MB直到OOM at dalvik.system.VMRuntime.newNonMovableArray（Native Method）在android.graphics.BitmapFactory.nativeDecodeAsset（本机方法）在android.graphics.BitmapFactory.decodeStream（BitmapFactory.java:609）在 android.graphics.BitmapFactory.decodeResourceStream（BitmapFactory.java:444）在 android.graphics.drawable.Drawable.createFromResourceStream（Drawable.java:1080）在 android.content.res.Resources.loadDrawableForCookie（Resources.java:2638）在android.content.res.Resources.loadDrawable（Resources.java:2543）在android.content.res.Resources.getDrawable（Resources.java:806）在android.content.Context.getDrawable（Context.java:458）在android.widget.ImageView.resolveUri（ImageView.java:826）在android.widget.ImageView.setImageResource（ImageView.java:433）在 com.example.name.mypackage.MainActivity $ PopulateRows.getView（MainActivity.java:55）在android.widget.AbsListView.obtainView（AbsListView.java:2346）在android.widget.ListView.measureHeightOfChildren（ListView.java:1281）在android.widget.ListView.onMeasure（ListView.java:1188）在android.view.View.measure（View.java:18809）在 android.support.constraint.ConstraintLayout.internalMeasureChildren（ConstraintLayout.java:934）在 android.support.constraint.ConstraintLayout.onMeasure（ConstraintLayout.java:973）在android.view.View.measure（View.java:18809）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5954）在android.widget.FrameLayout.onMeasure（FrameLayout.java:194）在android.view.View.measure（View.java:18809）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5954）在 android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1465）在android.widget.LinearLayout.measureVertical（LinearLayout.java:748）在android.widget.LinearLayout.onMeasure（LinearLayout.java:630）在android.view.View.measure（View.java:18809）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5954）在android.widget.FrameLayout.onMeasure（FrameLayout.java:194）在 com.android.internal.policy.PhoneWindow $ DecorView.onMeasure（PhoneWindow.java:2643）在android.view.View.measure（View.java:18809）在android.view.ViewRootImpl.performMeasure（ViewRootImpl.java:2112）在android.view.ViewRootImpl.measureHierarchy（ViewRootImpl.java:1228）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1464）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1119）在 android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6060）在 android.view.Choreographer $ CallbackRecord.run（Choreographer.java:858）在android.view.Choreographer.doCallbacks（Choreographer.java:670）在android.view.Choreographer.doFrame（Choreographer.java:606）在 android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:844）在android.os.Handler.handleCallback（Handler.java:746）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5443） at java.lang.reflect.Method.invoke（Native Method）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:728）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:618）

使列表无图像显示的代码，仅显示字符串数组

public class MainActivity extends Activity {
    ListView l;
    //int [] Images = {R.drawable.img1,R.drawable.img2, R.drawable.img3, R.drawable.img4, R.drawable.img5, R.drawable.img6, R.drawable.img7, R.drawable.img8, R.drawable.img9, R.drawable.img10};
    String [] Titles;
    String [] Description;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Resources resources=getResources();
        Titles = resources.getStringArray(R.array.Title);
        Description = resources.getStringArray(R.array.Description);
        l = findViewById(R.id.listView);
        PopulateRows arrayAdapter = new PopulateRows(this, Titles, Description);
        l.setAdapter(arrayAdapter);

    }
    class PopulateRows extends ArrayAdapter<String>{
        Context context;
        //int [] Images;
        String[] Titles;
        String [] Description;
        PopulateRows(Context context, String[] Titles, String[] Description){
            super(context,R.layout.custom_layout, R.id.textView, Titles);
            this.context=context;
            //this.Images=imgs;
            this.Titles=Titles;
            this.Description=Description;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(LAYOUT_INFLATER_SERVICE);
            View row = inflater.inflate(R.layout.custom_layout,parent,false);

            //ImageView imageView = row.findViewById(R.id.imageView);
            TextView textView =  row.findViewById(R.id.textView);
            TextView textView1 = row.findViewById(R.id.textView1);

            //imageView.setImageResource(Images[position]);
            textView.setText(Titles[position]);
            textView1.setText(Description[position]);
            return row;
        }
    }
}

Answer 1

Java内存不足错误意味着图像的分辨率非常高。您的观点不会被填充，这就是您收到崩溃的原因。

通过绘制不同的屏幕分辨率来调整图像分辨率 drawable - hdpi，drawable - xhdpi，drawable - xxhdpi，drawable - xxxhdpi。

如果您的图片内容更多，请尝试使用recycleview，而不是listview。

Answer 2

尝试使用具有最小尺寸的图像，因为您正在使用的图像会导致代码崩溃，您可以使用更多

Hello world

在android清单中如下

android:hardwareAccelerated="false" 
android:largeHeap="true"

通过this link获取更多信息....

ListView的图像和字符串数组不起作用

2 个答案: