Question

public class MainActivity extends AppCompatActivity {

private String url = "http://172.16.156.56";
private String url_file="/fetch.php";
private String sql_table = "products";
private ListView list;
ArrayList<String> rows;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    list=(ListView) findViewById(R.id.listView);
    rows = new ArrayList<String>();

    new RetrieveSQLRecords().execute(url + url_file);
}

private class RetrieveSQLRecords extends AsyncTask<String, Void, Void> {

    private String Content;
    private ProgressDialog Dialog = new ProgressDialog(MainActivity.this);

    protected void onPreExecute() {

        Dialog.setMessage("Please wait..");
        Dialog.show();
    }

    protected Void doInBackground(String... urls) {

        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(urls[0]);

        try {
            HttpResponse response = httpclient.execute(httppost);
            Content = inputStreamToString(response.getEntity().getContent());
        }

        catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    protected void onPostExecute(Void unused) {

        Dialog.dismiss();
        JSONObject jsonResponse;

        try {
            jsonResponse = new JSONObject(Content);
            JSONArray jsonMainNode = jsonResponse.optJSONArray(sql_table);

            for(int i=0; i < jsonMainNode.length(); i++)
            {
                JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
                String id       = jsonChildNode.optString("id").toString();
                String title     = jsonChildNode.optString("title").toString();
                String description = jsonChildNode.optString("description").toString();
                String img_url = jsonChildNode.optString("img_url").toString();
                rows.add(id + ". " + title + ", " + description + ", " + img_url);
            }
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this,
                    android.R.layout.simple_list_item_1, rows);
            list.setAdapter(adapter);

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

private String inputStreamToString(InputStream is) {
    String rLine = "";
    StringBuilder answer = new StringBuilder();
    BufferedReader rd = new BufferedReader(new InputStreamReader(is));
    String strAns = "";

    try {
        while ((rLine = rd.readLine()) != null) {
            answer.append(rLine);
        }
        strAns = answer.toString();
    }

    catch (IOException e) {
        e.printStackTrace();
    }
    return strAns;
}

这些是我的主要活动代码，但我无法连接到我在phpMyAdmin设置的数据库。当我直接从我的电脑浏览时，我可以，但不使用它，当我想启动我的应用程序时，应用程序崩溃。

Answer 1

检查Mainfest.xml文件中的权限...... Internet权限和读写

无法连接到phpMyAdmin数据库

1 个答案: