Android使用okhttp通信的方法_Android

一，安装第三方库:

1,库地址:

https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp

2,安装

在build.gradle的dependencies中增加一行:

implementation 'com.squareup.okhttp3:okhttp:4.12.0'

如下:

dependencies {
    implementation libs.appcompat
    implementation libs.material
    implementation libs.activity
    implementation libs.constraintlayout
    testimplementation libs.junit
    androidtestimplementation libs.ext.junit
    androidtestimplementation libs.espresso.core
    implementation 'com.squareup.okhttp3:okhttp:4.12.0'
}

然后点击 sync now

二，配置权限:

在androidmanifest.xml中添加权限:

<uses-permission android:name="android.permission.internet" />

否则会报以下错误:

java.lang.securityexception: permission denied (missing internet permission?)

三，代码：

package com.example.okdemo1;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.toast;
import androidx.activity.edgetoedge;
import androidx.annotation.nonnull;
import androidx.appcompat.app.appcompatactivity;
import androidx.core.graphics.insets;
import androidx.core.view.viewcompat;
import androidx.core.view.windowinsetscompat;
import java.io.ioexception;
import okhttp3.call;
import okhttp3.callback;
import okhttp3.okhttpclient;
import okhttp3.request;
import okhttp3.response;
public class mainactivity extends appcompatactivity {
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        edgetoedge.enable(this);
        setcontentview(r.layout.activity_main);
        viewcompat.setonapplywindowinsetslistener(findviewbyid(r.id.main), (v, insets) -> {
            insets systembars = insets.getinsets(windowinsetscompat.type.systembars());
            v.setpadding(systembars.left, systembars.top, systembars.right, systembars.bottom);
            return insets;
        });
        //给按钮增加点击事件
        button mybutton = findviewbyid(r.id.apibutton);
        mybutton.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view v) {
                // 处理点击事件
                dogetdata();
             }
        });
    }
    //以get方式访问互联网上的页面，并返回数据
    private void dogetdata() {
        toast.maketext(mainactivity.this, "按钮被点击了！", toast.length_long).show();
        //1.创建httpclient对象
        okhttpclient okhttpclient = new okhttpclient();
        //2.获取request对象
        request.builder builder = new request.builder().url("https://www.bilibili.com/");
        request request = builder.build();
        //3.异步请求发起
        okhttpclient.newcall(request).enqueue(new callback() {
            @override
            public void onfailure(@nonnull call call, @nonnull ioexception e) {
            }
            @override
            public void onresponse(@nonnull call call, @nonnull response response) throws ioexception {
                try {
                    string result = response.body().string();
                    //如果需要更新主线程的 ui 如果使用 rxjava 以及 retrofit 就不用这样处理了
                    system.out.println("网络请求返回结果:");
                    system.out.println(result);
                } catch (ioexception e) {
                    throw new runtimeexception(e);
                }
            }
        });
    }
}