本文介绍了使用Volley在Android Studio上显示MySQL数据的问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在学习并尝试使用php将一些MySQL数据显示到php的android studio中.该应用程序正在正常运行，但未显示数据.我试图找出原因，但是几天没碰运气(可能是由于我还是Android Studio和Java的新手).
I am learning and trying to display some MySQL data using php to android studio using volley. The app is running with no errors but the data is not being displayed. I have tried to figure out why but had no luck for a few days (possibly due to I am still new to android studio and Java).
我的.sql是:
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
START TRANSACTION;
SET time_zone = "+00:00";
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
--
-- Database: `testing`
--
-- --------------------------------------------------------
--
-- Table structure for table `test1`
--
CREATE TABLE `test1` (
`name` varchar(3) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
`moivename` varchar(3) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
--
-- Dumping data for table `test1`
--
INSERT INTO `test1` (`name`, `moivename`) VALUES
('ab', 'cd'),
('ef', 'gh');
COMMIT;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
我的api是:
<?php
$servername = "127.0.0.1";
$username = "root";
$password = "MyPW";
$dbname = "testing";
// Create connection
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = new mysqli($servername, $username, $password, $dbname);
$conn->set_charset('utf8');
$sql = "SELECT * FROM test1";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
$rows = $result->fetch_all(MYSQLI_ASSOC);
echo json_encode($rows);
} else {
echo "no results found";
}
导入androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final String HI ="http://xxx/phpMyAdmin-5.0.4/Api.php" ; //xxx is ip and the user name
private List<List_Data> list_data;
private RecyclerView rv;
private MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv=(RecyclerView)findViewById(R.id.recyclerView);
rv.setHasFixedSize(true);
rv.setLayoutManager(new LinearLayoutManager(this));
list_data=new ArrayList<>();
adapter=new MyAdapter(list_data);
getMovieData();
}
private void getMovieData() {
StringRequest stringRequest=new StringRequest(Request.Method.GET, HI, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray array=new JSONArray(response);
for (int i=0; i<array.length(); i++ ){
JSONObject ob=array.getJSONObject(i);
List_Data listData=new List_Data(ob.getString("name")
,ob.getString("moivename"));
list_data.add(listData);
}
adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue= Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
JSON格式为:
[{"name":"ab","moivename":"cd"},{"name":"ef","moivename":"gh"}]
适配器是:
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
private List<List_Data>list_data;
public MyAdapter(List<List_Data> list_data) {
this.list_data = list_data;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.list_data,parent,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
List_Data listData=list_data.get(position);
holder.txtname.setText(listData.getName());
holder.txtmovie.setText(listData.getMoviename());
}
@Override
public int getItemCount() {
return list_data.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView txtname,txtmovie;
public ViewHolder(View itemView) {
super(itemView);
txtname=(TextView)itemView.findViewById(R.id.txt_name);
txtmovie=(TextView)itemView.findViewById(R.id.txt_moviename);
}
}
}
此外，我像这样设置类:
Also, I setup the class like so:
public class List_Data {
private String name;
private String moviename;
public List_Data(String name, String moviename) {
this.name = name;
this.moviename = moviename;
}
public String getName() {
return name;
}
public String getMoviename() {
return moviename;
}
}
activity_main.xml是:
And the activity_main.xml is:
<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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
还有list_data.xml:
And list_data.xml:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<androidx.cardview.widget.CardView
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<LinearLayout
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_marginLeft="10dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:textColor="#111"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="name:"/>
<TextView
android:id="@+id/txt_name"
android:textColor="#111"
android:layout_marginLeft="10dp"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
<LinearLayout
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<LinearLayout
android:layout_marginLeft="10dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:textColor="#111"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="moivename:"/>
<TextView
android:id="@+id/txt_moviename"
android:textColor="#111"
android:layout_marginLeft="10dp"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
我有没有听错的地方吗?
Is there something wrong that I did not catch?
更新:按照建议将电影名称更改为电影名称，但应用程序仍不显示MySQL数据
日志猫:
2021-01-13 19:16:22.218 27201-27201/? I/fetchingtestin: Not late-enabling -Xcheck:jni (already on)
2021-01-13 19:16:22.330 27201-27201/? I/fetchingtestin: Unquickening 12 vdex files!
2021-01-13 19:16:22.353 27201-27201/? W/fetchingtestin: Unexpected CPU variant for X86 using defaults: x86
2021-01-13 19:16:23.338 27201-27201/com.example.fetchingtesting D/NetworkSecurityConfig: No Network Security Config specified, using platform default
2021-01-13 19:16:23.339 27201-27201/com.example.fetchingtesting D/NetworkSecurityConfig: No Network Security Config specified, using platform default
2021-01-13 19:16:23.398 27201-27228/com.example.fetchingtesting D/libEGL: loaded /vendor/lib/egl/libEGL_emulation.so
2021-01-13 19:16:23.437 27201-27228/com.example.fetchingtesting D/libEGL: loaded /vendor/lib/egl/libGLESv1_CM_emulation.so
2021-01-13 19:16:23.447 27201-27228/com.example.fetchingtesting D/libEGL: loaded /vendor/lib/egl/libGLESv2_emulation.so
2021-01-13 19:16:23.586 27201-27201/com.example.fetchingtesting W/fetchingtestin: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
2021-01-13 19:16:23.587 27201-27201/com.example.fetchingtesting W/fetchingtestin: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
2021-01-13 19:16:23.768 27201-27225/com.example.fetchingtesting D/HostConnection: HostConnection::get() New Host Connection established 0xecf9ef50, tid 27225
推荐答案
android:usesCleartextTraffic ="true"
android:usesCleartextTraffic="true"
将其放入清单文件
https://developer.android.com/guide/topics/manifest/application-element#usesCleartextTraffic 对此进行检查
这篇关于使用Volley在Android Studio上显示MySQL数据的问题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！