dstew32424
dstew32424
2016-08-08 15:35

如何从登录的用户过滤ListView?

已采纳

I want my Android project to have a ListView that will able to let the users see their own posts. I have done the one-to-many relationship on my serverside database using the username to determine who is the poster of which post. How can I filter the ListView to the corresponding username of the logged in username. I used SharedPreferences for login...

well, here are my codes.

Login

MainActivity

public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {


final String TAG = this.getClass().getName();
Button btnLogin;
EditText etUsername, etPassword;
TextView tvRegister;
CheckBox cbRemember;
SharedPreferences pref;
SharedPreferences.Editor editor;
boolean checkFlag;
int x = 0;
Toolbar toolbar;
public static final String pref_name = "your shared preference name";
String userId = "userID";


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

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    etUsername = (EditText) findViewById(R.id.etFirstname);
    etPassword = (EditText) findViewById(R.id.etPassword);
    btnLogin = (Button) findViewById(R.id.btnLogin);
    tvRegister = (TextView) findViewById(R.id.tvRegister);
    cbRemember = (CheckBox) findViewById(R.id.cbRemember);
    cbRemember.setOnCheckedChangeListener(this);
    checkFlag = cbRemember.isChecked();

    pref = getSharedPreferences("Login.conf", Context.MODE_PRIVATE);
    editor = pref.edit();


    final String username = pref.getString("username", "");
    String password = pref.getString("password", "");

    HashMap postData = new HashMap();
    postData.put("username", username);
    postData.put("password", password);

    if (!username.equals("") && (!password.equals(""))) {
        PostResponseAsyncTask task1 = new PostResponseAsyncTask(MainActivity.this, postData,
                new AsyncResponse() {
                    @Override
                    public void processFinish(String s) {

                if (s.contains("renter")) {
                    Log.d(TAG, s);
                    Toast.makeText(MainActivity.this, "Renter Login Successful!", Toast.LENGTH_SHORT).show();
                    Intent in = new Intent(MainActivity.this, ListActivity.class);
                    startActivity(in);

                    finish();

                } else if (s.contains("owner")) {
                    Log.d(TAG, s);
                    Toast.makeText(MainActivity.this, "Owner Login Successful!", Toast.LENGTH_SHORT).show();
                    Intent in = new Intent(MainActivity.this, ownerhome.class);
                    startActivity(in);
                    finish();
                } else {
                    Toast.makeText(MainActivity.this, "Login Failed!", Toast.LENGTH_SHORT).show();
                }

                    }
                });
        task1.execute("http://carkila.esy.es/authenticate.php");

    }

    btnLogin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            HashMap postData = new HashMap();


            postData.put("username", etUsername.getText().toString());
            postData.put("password", MD5.encrypt(etPassword.getText().toString()));

            PostResponseAsyncTask task1 = new PostResponseAsyncTask(MainActivity.this, postData,
                    new AsyncResponse() {
                        @Override
                        public void processFinish(String s) {
                            Log.d(TAG,s);
                            if (s.contains("renter")) {
                                if (checkFlag) {


                                    editor.putString("username", etUsername.getText().toString());
                                    editor.putString("password", MD5.encrypt(etPassword.getText().toString()));


                                    editor.apply();

                                    Log.d(TAG, pref.getString("password", ""));
                                }

                                Toast.makeText(MainActivity.this, "Renter Login Successful!", Toast.LENGTH_SHORT).show();
                                Intent in = new Intent(MainActivity.this, ListActivity.class);
                                startActivity(in);
                                finish();

                            } else if (s.contains("owner")) {

                                if (checkFlag) {


                                    editor.putString("username", etUsername.getText().toString());
                                    editor.putString("password", MD5.encrypt(etPassword.getText().toString()));


                                    editor.apply();
                                }

                                editor.putString("username", etUsername.getText().toString());
                                editor.putString("password", MD5.encrypt(etPassword.getText().toString()));
                                editor.apply();

                                Toast.makeText(MainActivity.this, "Owner Login Successful!", Toast.LENGTH_SHORT).show();
                                Intent in = new Intent(MainActivity.this, ownerhome.class);
                                startActivity(in);
                                finish();
                            } else {
                                Toast.makeText(MainActivity.this, "Login Failed!", Toast.LENGTH_SHORT).show();
                            }


                        }
                    });
            task1.execute("http://carkila.esy.es/authenticate.php");
        }
    });

    tvRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent in = new Intent(MainActivity.this, RegisterActivity.class);
            startActivity(in);
            finish();

        }
    });
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    checkFlag = isChecked;
    Log.d(TAG, "checkflag: " + checkFlag);
}


}

Authenticate.php

    <?php 
require 'database-config.php';

session_start();


$username = "";
$password = "";

if(isset($_POST['username'])){
$username = $_POST['username'];
}
if (isset($_POST['password'])) {
$password = $_POST['password'];
}
if (isset ($_SESSION['userID'])){
$userID = $_SESSION['userID'];
}


$q = 'SELECT * FROM tbl_user WHERE username=:username AND password=:password';

$query = $dbh->prepare($q);

$query->execute(array(':username' => $username, ':password' => $password));


if($query->rowCount() == 0){
header('Location: Login.php?err=1');
}else{

$row = $query->fetch(PDO::FETCH_ASSOC);
session_regenerate_id();
$_SESSION['sess_user_id'] = $row['userID'];
$_SESSION['sess_username'] = $row['username'];
$_SESSION['sess_userrole'] = $row['roles'];



if( $_SESSION['sess_userrole'] == "renter"){
echo "renter";

echo $_SESSION['sess_user_id'];



}else if ($_SESSION['sess_userrole'] == "owner"){
echo "owner";

echo $_SESSION['sess_user_id'];


}
}
?>          

The listview I wanted to be filtered with who posted it based on who logs in.

ownerhome

public class ownerhome extends AppCompatActivity implements AsyncResponse, AdapterView.OnItemClickListener {
final String TAG = this.getClass().getName();
private ArrayList<Cars> carList;
private ListView lvCars;
private FunDapter<Cars> adapter;
SharedPreferences pref;
SharedPreferences.Editor editor;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ownerhome);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    ImageLoader.getInstance().init(UILConfig.config(ownerhome.this));


    lvCars = (ListView) findViewById(R.id.lvOnwer);

    pref = getSharedPreferences("Login.conf", Context.MODE_PRIVATE);

    Log.d(TAG, pref.getString("username", ""));
    Log.d(TAG, pref.getString("password", ""));

PostResponseAsyncTask taskRead = new PostResponseAsyncTask(ownerhome.this, this);

    taskRead.execute("http://carkila.esy.es/user.php");

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent in = new Intent(ownerhome.this, InsertActivity.class);
            startActivity(in);
        }
    });

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater findMenuItems = getMenuInflater();
    findMenuItems.inflate(R.menu.menu_main, menu);
    return super.onCreateOptionsMenu(menu);

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if(id == R.id.action_logout){
        editor = pref.edit();
        editor.clear();
        editor.commit();
        Intent in = new Intent(ownerhome.this, MainActivity.class);
        startActivity(in);
        finish();
    }
    return super.onOptionsItemSelected(item);
}


@Override
public void processFinish(String s) {
    Log.d(TAG, s);


    carList = new JsonConverter<Cars>().toArrayList(s,Cars.class);

    BindDictionary<Cars> dict = new BindDictionary<Cars>();

    dict.addDynamicImageField(R.id.ivImg, new StringExtractor<Cars>() {
        @Override
        public String getStringValue(Cars product, int position) {
            return product.Image;
        }
    }, new DynamicImageLoader() {
        @Override
        public void loadImage(String url, ImageView imageView) {

            ImageLoader.getInstance().displayImage(url, imageView); // Default options will be used

        }
    });
    dict.addStringField(R.id.tvCarModel, new StringExtractor<Cars>() {
        @Override
        public String getStringValue(Cars product, int position) {
            return "Car Model: " + product.Car_Model;
        }
    });
    dict.addStringField(R.id.tvCarType, new StringExtractor<Cars>() {
        @Override
        public String getStringValue(Cars product, int position) {
            return "Car Type: " + product.Car_Type;
        }
    });

    dict.addStringField(R.id.tvCapacity, new StringExtractor<Cars>() {
        @Override
        public String getStringValue(Cars product, int position) {
            return "Capacity: " + product.Capacity;
        }
    });
    dict.addStringField(R.id.tvFuelType, new StringExtractor<Cars>() {
        @Override
        public String getStringValue(Cars product, int position) {
            return "Fuel Type: " + product.FuelType;
        }
    });
    dict.addStringField(R.id.tvPlateNumber, new StringExtractor<Cars>() {
        @Override
        public String getStringValue(Cars product, int position) {
            return "Plate Number: " + product.PlateNumber;
        }
    });
    dict.addStringField(R.id.tvPoster, new StringExtractor<Cars>() {
        @Override
        public String getStringValue(Cars product, int position) {
            return "Posted by: " + product.owner;
        }
    });


adapter = new FunDapter<>(
        ownerhome.this, carList, R.layout.layout_list, dict);

lvCars.setAdapter(adapter);
lvCars.setOnItemClickListener(this);

}



@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Cars selectedCars = carList.get(position);
    Intent in = new Intent(ownerhome.this, DetailActivity.class);
    in.putExtra("cars", selectedCars);
    startActivity(in);
}
}

user.php

<?PHP
include_once("connection.php");

session_start();

$query = "SELECT * FROM tbl_cars ORDER BY Car_No DESC "; 

$result = mysqli_query($conn, $query);

while($row = mysqli_fetch_assoc($result)){
        $data[] = $row;
}
echo json_encode($data);

?>

Cars

public class Cars implements Serializable {

@SerializedName("Car_No")
public int Car_No;

@SerializedName("Car_Model")
public String Car_Model;

@SerializedName("Car_Type")
public String Car_Type;

@SerializedName("Capacity")
public  int Capacity;

@SerializedName("Image")
public String Image;

@SerializedName("fuelType")
public String FuelType;

@SerializedName("carPlatenuNumber")
public String PlateNumber;

@SerializedName("owner")
public String owner;

}
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3条回答

  • duangang1991 duangang1991 5年前

    Use $GET for the json filtering.

    $where = '';
    if (isset($_GET['owner'])){
    $where = " WHERE owner like '%".addslashes($_GET['owner'])."%'";
    }
    $query = "SELECT * FROM tbl_cars ".$where." ORDER BY Car_No DESC"; 
    

    And on the

    PostResponseAsyncTask taskRead = new PostResponseAsyncTask(ownerhome.this, this);
    
    taskRead.execute("http://carkila.esy.es/user.php");
    

    replace taskRead.execute("http://carkila.esy.es/user.php"); with taskRead.execute("http://carkila.esy.es/user.php?"+pref.getString("username", ""));

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  • duanci9305 duanci9305 5年前

    There are multiple ways of filtering a Collection. You could even do this server-side if you wanted to. But, since it seems like you want to do it client-side, I will show you how you can filter a list on Android.

    Assuming that your carList has a username field, you can create a new ArrayList and populate it with only the Cars that contain the correct username:

    String username = pref.getString("username", "");
    
    List<Cars> filteredList = new ArrayList<>();
    
    for(Cars car : carList) {
        if(car.owner == username) {
            filteredList.add(car);
        }
    }
    

    Then you can just use this new ArrayList to populate your ListView.

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  • doushifang4382 doushifang4382 5年前

    Correct me if I'm not understanding your data storage correctly, but I'm assuming you mean you've created some sort of post object which has a place to store data, and knows who posted it, user_id.

    Say you wanted to populate a list view with all posts made by user with id 34.

    Running a query to your server filtering posts by user_id should return a list of posts by that user.

    I.E. http://[url to your API]/posts?user_id=34 would return a response including all posts with "user_id"=34.

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