Android中网络请求 Volley

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注意：网络请求----一定要注意权限*********

1、Activity代码

public class MainActivity extends AppCompatActivity {    private String urlGet = "http://218.244.149.129:9010/api/companylist.php?industryid=99";    private String urlPost = "http://218.244.149.129:9010/api/companylist.php";    private String jsonUrl = "http://mobile.ximalaya.com/m/category_tag_menu";    private String imageUrl = "https://www.baidu.com/img/bd_logo1.png";    private RequestQueue queue;    private StringRequest requestGet;    private StringRequest requestPost;    private ImageView iv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        iv = (ImageView) findViewById(R.id.imageView);        //创建RequestQueue        queue = Volley.newRequestQueue(this);    }    /**     * StringRequest Get请求     *     * @param view     */    public void btnStringRequestGet(View view) {        //Get请求        requestGet = new StringRequest(Request.Method.GET, urlGet, new Response.Listener<String>() {            @Override            public void onResponse(String s) {                Log.i("main", "get-->" + s);            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError volleyError) {            }        }        );        queue.add(requestGet);    }    /**     * StringRequest Post请求     *     * @param view     */    public void btnStringRequestPost(View view) {        requestPost = new StringRequest(Request.Method.POST, urlPost, new Response.Listener<String>() {            @Override            public void onResponse(String s) {                Log.i("main", "post-->" + s);            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError volleyError) {            }        }) {            @Override            protected Map<String, String> getParams() throws AuthFailureError {                Map<String, String> map = new HashMap<>();                map.put("industryid", "99");                return map;            }        };        queue.add(requestPost);    }    /**     * 进行JsonRequest请求     *     * @param view     */    public void json(View view) {        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(jsonUrl,                null,//购物软件一般需要传递商品的Json对象                new Response.Listener<JSONObject>() {                    @Override                    public void onResponse(JSONObject jsonObject) {                        Log.i("main", "json--->" + jsonObject.toString());                    }                }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError volleyError) {            }        });        queue.add(jsonObjectRequest);    }    /**     * 进行ImageRequest请求     *     * @param view     */    public void image(View view) {        ImageRequest imageRequest = new ImageRequest(imageUrl, new Response.Listener<Bitmap>() {            @Override            public void onResponse(Bitmap bitmap) {                if (bitmap != null) {                    iv.setImageBitmap(bitmap);                }            }        }, 256, 128, Bitmap.Config.RGB_565, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError volleyError) {            }        });        queue.add(imageRequest);    }}

2、布局

<?xml version="1.0" encoding="utf-8"?><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:orientation="vertical"    android:padding="10dp">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="btnStringRequestGet"        android:text="StringGet联网请求" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="btnStringRequestPost"        android:text="StringPost联网请求" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="json"        android:text="JsonRequest请求" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="image"        android:text="ImageRequest请求" />    <ImageView        android:id="@+id/imageView"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

错误：

android Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated wi

原因：

没有数据（没有地址与主机结合）
还是网络权限的问题

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

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