我正在从事与Android相关的作业。我尝试了3次,并查看了各种方法来解决我面临的问题,但结果仍然相同。
此项目与android原生有关,但使用mysql和带有托管代码的php代码及其数据库。
当我完成编写的代码时,没有红色符号,但是在调试和测试logcat时,它会显示这样的错误消息
2019-07-20 19:28:26.776 1109-1109/? W/WindowManager: removeWindowToken: Attempted to remove non-existing token: android.os.Binder@eab9d7a
2019-07-20 19:28:26.975 14345-14345/com.halimlab.koneksicrud W/System.err: org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
2019-07-20 19:28:26.976 14345-14345/com.halimlab.koneksicrud W/System.err: at org.json.JSON.typeMismatch(JSON.java:112)
2019-07-20 19:28:26.976 14345-14345/com.halimlab.koneksicrud W/System.err: at org.json.JSONObject.<init>(JSONObject.java:163)
2019-07-20 19:28:26.976 14345-14345/com.halimlab.koneksicrud W/System.err: at org.json.JSONObject.<init>(JSONObject.java:176)
2019-07-20 19:28:26.976 14345-14345/com.halimlab.koneksicrud W/System.err: at com.halimlab.koneksicrud.TampilanSemuaBarang.tampilBarang(TampilanSemuaBarang.java:56)
2019-07-20 19:28:26.976 14345-14345/com.halimlab.koneksicrud W/System.err: at com.halimlab.koneksicrud.TampilanSemuaBarang.access$100(TampilanSemuaBarang.java:26)
2019-07-20 19:28:26.976 14345-14345/com.halimlab.koneksicrud W/System.err: at com.halimlab.koneksicrud.TampilanSemuaBarang$1GetJSON.onPostExecute(TampilanSemuaBarang.java:94)
2019-07-20 19:28:26.977 14345-14345/com.halimlab.koneksicrud W/System.err: at com.halimlab.koneksicrud.TampilanSemuaBarang$1GetJSON.onPostExecute(TampilanSemuaBarang.java:80)
2019-07-20 19:28:26.977 14345-14345/com.halimlab.koneksicrud W/System.err: at android.os.AsyncTask.finish(AsyncTask.java:695)
2019-07-20 19:28:26.977 14345-14345/com.halimlab.koneksicrud W/System.err: at android.os.AsyncTask.access$600(AsyncTask.java:180)
2019-07-20 19:28:26.977 14345-14345/com.halimlab.koneksicrud W/System.err: at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
2019-07-20 19:28:26.977 14345-14345/com.halimlab.koneksicrud W/System.err: at android.os.Handler.dispatchMessage(Handler.java:106)
2019-07-20 19:28:26.977 14345-14345/com.halimlab.koneksicrud W/System.err: at android.os.Looper.loop(Looper.java:193)
2019-07-20 19:28:26.978 14345-14345/com.halimlab.koneksicrud W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6739)
2019-07-20 19:28:26.978 14345-14345/com.halimlab.koneksicrud W/System.err: at java.lang.reflect.Method.invoke(Native Method)
2019-07-20 19:28:26.978 14345-14345/com.halimlab.koneksicrud W/System.err: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)
2019-07-20 19:28:26.978 14345-14345/com.halimlab.koneksicrud W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:859)
2019-07-20 19:28:27.068 545-1023/? W/SurfaceFlinger: Attempting to set client state on removed layer: Mengambil Data#0
2019-07-20 19:28:27.068 545-1023/? W/SurfaceFlinger: Attempting to set client state on removed layer: Dim Layer for - Task=1791#0
2019-07-20 19:28:27.068 545-1023/? W/SurfaceFlinger: Attempting to destroy on removed layer: Mengambil Data#0
2019-07-20 19:28:27.068 545-1023/? W/SurfaceFlinger: Attempting to destroy on removed layer: Dim Layer for - Task=1791#0
错误消息指向以下功能中正确文件中的一行,我不太了解发生了什么,所以请帮助我
private void tampilBarang(){
JSONObject jsonObject = null;
ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String, String>>();
try {
jsonObject = new JSONObject(JSON_STRING);
JSONArray result = jsonObject.getJSONArray(konfigurasi.TAG_JSON_ARRAY);
for(int i = 0; i<result.length(); i++){
JSONObject jo = result.getJSONObject(i);
String id = jo.getString(konfigurasi.TAG_ID);
String name = jo.getString(konfigurasi.TAG_NAMA);
HashMap<String,String> employees = new HashMap<>();
employees.put(konfigurasi.TAG_ID,id);
employees.put(konfigurasi.TAG_NAMA,name);
list.add(employees);
}
} catch (Exception e) {
e.printStackTrace();
}
ListAdapter adapter = new SimpleAdapter(
TampilanSemuaBarang.this, list, R.layout.list_item,
new String[]{konfigurasi.TAG_ID, konfigurasi.TAG_NAMA},
new int[]{R.id.id, R.id.name}
);
listView.setAdapter(adapter);
}
这是与错误相对应的文件的代码
<?php
//Import File Koneksi Database
require_once('conn.php');
//Membuat SQL Query
$sql = "SELECT * FROM barang";
//Mendapatkan Hasil
$r = mysqli_query($con,$sql);
//Membuat Array Kosong
$result = array();
while($row = mysqli_fetch_array($r)){
//Memasukkan Nama dan ID kedalam Array Kosong yang telah dibuat
array_push($result,array(
"id"=>$row['id_barang'],
"name"=>$row['nama_barang']
));
}
//Menampilkan Array dalam Format JSON
echo json_encode(array('result'=>$result));
mysqli_close($con);
?>
和
<?php
//Mendapatkan Nilai Dari Variable ID Pegawai yang ingin ditampilkan
$id = $_GET['id_barang'];
//Importing database
require_once('conn.php');
//Membuat SQL Query dengan pegawai yang ditentukan secara spesifik sesuai ID
$sql = "SELECT * FROM barang WHERE id_barang=$id";
//Mendapatkan Hasil
$r = mysqli_query($con, $sql);
//Memasukkan Hasil Kedalam Array
$result = array();
$row = mysqli_fetch_array($r);
array_push($result,array(
"id_barang"=>$row['id_barang'],
"nama_barang"=>$row['nama_barang'],
"kode_barang"=>$row['kode_barang'],
"stok_barang"=>$row['stok_barang']
));
//Menampilkan dalam format JSON
echo json_encode(array('result'=>$result));
mysqli_close($con);
?>
我只是希望所有这些都可以轻松解决,谢谢