使用Picaso加载并链接到布局文件后，ImageView图像未显示 [英] ImageView image not showing after loading with Picaso and linking to layout file

问题描述

我想显示一个单选按钮，并在其旁边显示一个ImageView，其中包含由Picaso加载的图像.我尝试将ImageView对象加载到相对布局中的单选按钮之后，然后将其放置，但仅显示单选按钮，而不显示图像.我是Android新手，不胜感激.谁能指出这个问题?

I want to show a radio button and next to it show a ImageView with image loaded by Picaso. I tried putting the ImageView object after loading it next to the radio button in Relative layout but only the radio button is showing up but not the the image. I am new to android and any help is appreciated. can anyone point out the issue?

MainActivity.java

MainActivity.java

package com.example.test.imageslider;



import androidx.core.content.ContextCompat;
import androidx.viewpager.widget.ViewPager;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RadioGroup;
import android.widget.RadioButton;
import android.view.View;
import android.view.ViewGroup;
import com.squareup.picasso.Picasso;


public class MainActivity extends AppCompatActivity {

    ViewPager viewPager;

    private String[] imageUrls = {"https://homepages.cae.wisc.edu/~ece533/images/airplane.png",
            "https://homepages.cae.wisc.edu/~ece533/images/arctichare.png",
            "https://homepages.cae.wisc.edu/~ece533/images/baboon.png"};

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

        //viewPager = (ViewPager) findViewById(R.id.viewPager);

        //ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(this);

        //viewPager.setAdapter(viewPagerAdapter);

        ImageView imageView;

        //this will set the image to your ImageView in your xml
        imageView = (ImageView)findViewById(R.id.myImage);

        Picasso.get()
                .load(imageUrls[0])
                .fit()
                .centerCrop()
                .into(imageView);
        RadioGroup ll = new RadioGroup(this);
        RadioButton rdbtn = new RadioButton(this);
        rdbtn.setId(View.generateViewId());
        ll.addView(rdbtn);
        ((ViewGroup) findViewById(R.id.radiogroup)).addView(ll);
    }

}

activity_main.xml

activity_main.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.test.imageslider.MainActivity">

    <!--<androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="190dp"
        android:layout_marginBottom="8dp"/> -->


    <RadioGroup
        android:id="@+id/radiogroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

    </RadioGroup>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/myImage" />
</RelativeLayout>

推荐答案

将height和weight赋予ImageView.我已经对其进行了测试，并且工作正常，

Give height and weight to ImageView. I have tested it and works fine,

<?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"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <!--<androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="190dp"
        android:layout_marginBottom="8dp"/> -->


    <RadioGroup
            android:id="@+id/radiogroup"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

    </RadioGroup>

    <ImageView
            android:id="@+id/myImage"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_toEndOf="@+id/radiogroup"/>
</RelativeLayout>

这篇关于使用Picaso加载并链接到布局文件后，ImageView图像未显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！