无法使用android eclipse连接mysql数据库？

Question

我的 MainActivity.java 类是：

错误是：

java.lang.NoClassDefFoundError:android.volley.toolbox.StringRequest

getData() 和 onClick() 中的错误

我添加了凌空库。在运行应用程序时，单击按钮后不幸应用程序关闭出现..数据库连接失败。

private void getData() {
String id = id1.getText().toString().trim();
if (id.equals("")) {
Toast.makeText(this, "Please enter an id", Toast.LENGTH_LONG).show();
return;
}
loading = ProgressDialog.show(this,"Please wait...","Fetching...",false,false);
String url = Config.DATA_URL+id1.getText().toString().trim();
StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
loading.dismiss();
showJSON(response);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
          Toast.makeText(MainActivity.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();
        }
    });

    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);
}

private void showJSON(String response){
    String name="";
    String age="";
    String address="";
    String district= "";
    String state="";
    String block="";
    String panchayat="";
    String phone="";
    try {
        JSONObject jsonObject = new JSONObject(response);
        JSONArray result = jsonObject.getJSONArray(Config.JSON_ARRAY);
        JSONObject farmerData = result.getJSONObject(0);
        name = farmerData.getString(Config.KEY_NAME);
        age=farmerData.getString(Config.KEY_AGE);
        address = farmerData.getString(Config.KEY_ADDRESS);
        district = farmerData.getString(Config.KEY_DISTRICT);
        state = farmerData.getString(Config.KEY_STATE);
        panchayat = farmerData.getString(Config.KEY_PANCHAYAT);
        block = farmerData.getString(Config.KEY_BLOCK);
        phone = farmerData.getString(Config.KEY_PHONE);
    } catch (JSONException e) {
        e.printStackTrace();
    }
    textView1.setText("Name:\t"+name+"\nAge:\t"+age+"\nAddress:\t" +address+ "\nDistrict:\t"+district+"\nState:\t"+state+"\nPanchayat:\t"+panchayat+"\nBlock:\t"+block+"\nPhone:\t"+phone);
}

@Override
public void onClick(View v) {
    getData();
}

Answer 1

将 volley aar 文件导入您的项目。它会解决问题。

Answer 2

您是否尝试过以下任何一种方法？

Android error - Caused by: java.lang.NoClassDefFoundError: android.support.v4.util.SparseArrayCompat Android java.lang.NoClassDefFoundError android studio java.lang.NoClassDefFoundError:

这些错误看起来是一样的：您的库没有正确导出