picasso加载图片

最新推荐文章于 2024-03-14 11:29:18 发布

黒曼巴

最新推荐文章于 2024-03-14 11:29:18 发布

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本文链接：https://blog.youkuaiyun.com/qq_41434746/article/details/82759690

本文详细介绍了如何在Android应用中使用Picasso库加载图片。首先，你需要从GitHub下载picasso-2.5.2.jar或者通过Gradle添加依赖。接着，在布局文件中配置ImageView，并在Java代码中使用Picasso进行图片加载。别忘了添加必要的请求权限。

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添加配置文件

1.下载路径：picasso-2.5.2.jar的下载路径：https://github.com/square/picasso
compile ‘com.squareup.picasso.picasso:2.5.2’

布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    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=".MainActivity"
    android:orientation="vertical" >
 
    <ImageView
        android:id="@+id/imageview1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    <ImageView
        android:id="@+id/imageview2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    <ImageView
        android:id="@+id/imageview3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    <ImageView
        android:id="@+id/imageview4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</LinearLayout>

Java文件


package com.zhc.picasso;
 
import java.io.File;
import com.squareup.picasso.Picasso;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Context;
import android.widget.ImageView;
 
public class MainActivity extends Activity {
 
	public static final String ANDROID_RESOURCE = "android.resource://";
	public static final String FOREWARD_SLASH = "/";
 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
 
		// 1.从安卓项目资源加载
		 ImageView targetImageView1 = (ImageView) findViewById(R.id.imageview1);
		 int resourceId = R.drawable.ic_launcher;
		 Picasso.with(getBaseContext()).load(resourceId).into(targetImageView1);
 
		 //2.从本地文件中加载
		 ImageView targetImageView2 = (ImageView) findViewById(R.id.imageview2);
		 File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"zhc.png");
		 Picasso.with(getBaseContext()).load(file).into(targetImageView2);
 
		// 3.从网络上加载图片
		 ImageView targetImageView3 = (ImageView) findViewById(R.id.imageview3);
		 String internetUrl =
		 "http://img03.sogoucdn.com/app/a/100520093/508de2a2df69f20f-ad54974be9c2600f-01f80ad8e3e76b8fe0205b58d9e59649.jpg";
		 Picasso.with(getBaseContext()).load(internetUrl).into(targetImageView3);
		// 备用网络路径：http://img03.sogoucdn.com/app/a/100520093/508de2a2df69f20f-ad54974be9c2600f-01f80ad8e3e76b8fe0205b58d9e59649.jpg
        //百度图片路径（这个应该是图片在网页上的路径，而不是图片路径）：http://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E5%9B%BE%E7%89%87&hs=0&pn=1&spn=0&di=71162346090&pi=0&rn=1&tn=baiduimagedetail&ie=utf-8&oe=utf-8&cl=2&lm=-1&cs=4155302816%2C1201715785&os=159233822%2C272436753&simid=3235028088%2C3077875656&adpicid=0&ln=30&fr=ala&fm=&sme=&cg=&bdtype=0&oriquery=&objurl=http%3A%2F%2Fpic33.nipic.com%2F20130916%2F3420027_192919547000_2.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bgtrtv_z%26e3Bv54AzdH3Fzi7wgptAzdH3Fb80b88_8l_z%26e3Bip4s&gsm=0		 
		 
		// 4.从URI加载图片（这里用资源文件转换为URI）
		Uri uri = resourceIdToUri(getBaseContext(), R.drawable.ic_launcher);
		ImageView targetImageView4 = (ImageView) findViewById(R.id.imageview4);
		Picasso.with(getBaseContext()).load(uri).into(targetImageView4);
 
	}
 
	private static Uri resourceIdToUri(Context context, int resourceId) {
		return Uri.parse(ANDROID_RESOURCE + context.getPackageName()
				+ FOREWARD_SLASH + resourceId);
	}
}

千万别忘记添加请求权限：

<uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
4》结果显示：