我需要使用PhpMyAdmin将我的Android应用程序链接到MySQL数据库。
我已经开始使用“登录”页面，我的代码中没有错误但我不确定为什么我无法获得成功的登录消息，尽管我的数据库中有相同的登录详细信息。
我已经从其他网站引用了这组代码。有人可以帮帮我吗？提前致谢！以下是我的参考代码..
login.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/diagmonds"
android:orientation="vertical" >
<TableLayout
android:id="@+id/tableLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="150dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:stretchColumns="1" >
<!-- Row 1 -->
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="20dp"
android:gravity="right"
android:text="Please Log In: "
android:textColor="#FF9900"
android:textStyle="bold"
android:layout_gravity="center_vertical|center_horizontal" >
</TextView>
</TableRow>
<!-- Row 2 -->
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:text="User Type: "
android:textColor="#FF9900" >
</TextView>
<EditText
android:id="@+id/etUserName"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:inputType="text"
android:gravity="center"
android:hint="staff / admin"
android:textColor="#ffff00"
android:textSize="18sp" >
</EditText>
</TableRow>
<!-- Row 3 -->
<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:text="Password: "
android:textColor="#FF9900" >
</TextView>
<EditText
android:id="@+id/etPassword"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:inputType="numberPassword"
android:gravity="center"
android:hint="enter password"
android:textColor="#ffff00"
android:textSize="18sp" >
</EditText>
</TableRow>
</TableLayout>
<Button
android:id="@+id/loginBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:layout_marginLeft="200dp"
android:background="#000000"
android:padding="13dp"
android:text="Login"
android:textColor="#FF9900"
android:textStyle="bold" />
<!-- <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:id="@+id/lbl_result"
android:text="login result here"
android:textColor="#FF0040">
</TextView> -->
</LinearLayout>
Login.java
public class Login extends Activity implements OnClickListener {
//Declaration
EditText etUserName;
EditText etPassword;
Button loginBtn;
//Create String variables that will have the input assigned to them
String username;
String password;
//Create a HTTPClient as the form container
HttpClient httpclient;
//Use HTTP Post method
HttpPost httppost;
//Create an array list for the input data to be sent
ArrayList<NameValuePair> nameValuePairs;
//Create a HTTP Response and HTTP Entity
HttpResponse response;
HttpEntity entity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
initialise();
}
private void initialise() {
// TODO Auto-generated method stub
etUserName = (EditText) findViewById(R.id.etUserName);
etPassword = (EditText) findViewById(R.id.etPassword);
loginBtn = (Button) findViewById(R.id.loginBtn);
//Set onClickListener for the button
loginBtn.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
//Create new default HTTPClient
httpclient = new DefaultHttpClient();
//Create new HTTP POST with URL to PHP file as parameter
httppost = new HttpPost("http://127.0.0.1/android_connect/login.php");
//Assign input text to strings
username = etUserName.getText().toString();
password = etPassword.getText().toString();
try{
//Create new array list
nameValuePairs = new ArrayList<NameValuePair>();
//Place them in an array list
nameValuePairs.add(new BasicNameValuePair("username", username));
nameValuePairs.add(new BasicNameValuePair("password", password));
//Add array list to HTTP Post
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Assign executed form container to response
response = httpclient.execute(httppost);
//Check status code, need to check status code = 200
if(response.getStatusLine().getStatusCode() == 200){
//Assign response entity to HTTP entity
entity = response.getEntity();
//Check if entity is not null
if(entity != null){
//Create new input stream with received data assigned
InputStream instream = entity.getContent();
//Create new JSON Object. Assign converted data as parameter
JSONObject jsonResponse = new JSONObject (convertStreamToString(instream));
//Assign JSON responses to local strings
String retUser = jsonResponse.getString("LoginUser");
String retPass = jsonResponse.getString("Password");
//Validate login
if(username.equals(retUser) && password.equals(retPass)){
//Create a new Shared Preference by getting the preference
SharedPreferences sp = getSharedPreferences("logindetails", 0);
//Edit the Shared Preference
SharedPreferences.Editor spedit = sp.edit();
//Put the login details as Strings
spedit.putString("user", username);
spedit.putString("password", password);
//Close the editor
spedit.commit();
//Display a toast saying the login was a success
Toast.makeText(getBaseContext(), "SUCCESS!", Toast.LENGTH_SHORT).show();
}else {
//Display toast saying it failed
Toast.makeText(getBaseContext(), "Invalid Login Details", Toast.LENGTH_SHORT).show();
}
}
}
} catch(Exception e){
e.printStackTrace();
//Display toast when there is connection error
Toast.makeText(getBaseContext(), "Login Unsuccessful", Toast.LENGTH_SHORT).show();
}
}//End of onClick()
private static String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the BufferedReader.readLine()
* method. We iterate until the BufferedReader return null which means
* there's no more data to read. Each line will appended to a StringBuilder
* and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}//END of convertStreamtoString()
}
答案 0 :(得分：1)
您正在执行 network I/O on the main thread ，这可能导致程序崩溃。尝试使用AsyncTask进行网络操作。
AsyncTask可以正确，轻松地使用UI线程。这个班 允许执行后台操作并在UI上发布结果 线程，而不必操纵线程和/或处理程序。