在spinner itemselected上重新加载数据

0aydgbwb  于 2021-06-20  发布在  Mysql
关注(0)|答案(2)|浏览(357)

我想我实现的微调器选择不当。
所以我从数据库中加载了微调器值。我正试图根据所选微调器加载数据，但微调器不会持久化，id也不会传递给活动。它加载的默认id是1，而不是所选的微调器id。因此我不确定是否传递了微调器id。如何检查和纠正这些问题？

package com.example.app;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.BottomNavigationView;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Response;
import com.android.volley.RetryPolicy;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.google.firebase.messaging.FirebaseMessaging;
import com.example.app.Config;
import com.example.app.R;
import com.example.app.fragment.FragmentCategory;
import com.example.app.fragment.FragmentFavorite;
import com.example.app.fragment.FragmentProfile;
import com.example.app.fragment.FragmentRecent;
import com.example.app.fragment.FragmentVideo;
import com.example.app.models.Constituency;
import com.example.app.utils.AppBarLayoutBehavior;
import com.example.app.utils.Constant;
import com.example.app.utils.GDPR;
import com.squareup.picasso.Picasso;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import uk.co.chrisjenx.calligraphy.CalligraphyConfig;

public class MainActivity extends AppCompatActivity {

String URL="https://xxx.xxx.xxx/api/get_constituency_index/?api_key="+ 
 Config.API_KEY;

private long exitTime = 0;
MyApplication myApplication;
View view;
private BottomNavigationView navigation;
public ViewPager viewPager;
private Toolbar toolbar;
MenuItem prevMenuItem;
int pager_number = 5;
BroadcastReceiver broadcastReceiver;
Spinner mySpinner;
ArrayList<String> spinnerConstituencyName;
int spinConstID;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Set Font
    CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
            .setDefaultFontPath("fonts/Arkhip_font.ttf")
            .setFontAttrId(R.attr.fontPath)
            .build());
    setContentView(R.layout.activity_main);
    view = findViewById(android.R.id.content);

    if (Config.ENABLE_RTL_MODE) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            getWindow().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
        }
    }

    AppBarLayout appBarLayout = findViewById(R.id.tab_appbar_layout);
    ((CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams()).setBehavior(new AppBarLayoutBehavior());

    myApplication = MyApplication.getInstance();

    toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    toolbar.setTitle(R.string.app_name);

    spinnerConstituencyName = new ArrayList<>();
    mySpinner = findViewById(R.id.mySpinner);
    loadSpinnerData(URL);

    mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        int check = 0;
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            /*String spinConstituency = mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString();
            Toast.makeText(getApplicationContext(), spinConstituency, Toast.LENGTH_LONG).show();*/

            if ( ++check > 1 ){

                PrefManager prefManager = new PrefManager(MainActivity.this);
                prefManager.writeString("" + spinConstID);
                Intent intent = getIntent();
                startActivity(intent);
                Toast.makeText(getApplicationContext(), mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString() + " Showing", Toast.LENGTH_SHORT).show();
                finish();
            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }

    });

    viewPager = findViewById(R.id.viewpager);
    viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
    viewPager.setOffscreenPageLimit(pager_number);

    navigation = findViewById(R.id.navigation);
    navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.navigation_home:
                    viewPager.setCurrentItem(0);
                    return true;
                case R.id.navigation_category:
                    viewPager.setCurrentItem(1);
                    return true;
                case R.id.navigation_video:
                    viewPager.setCurrentItem(2);
                    return true;
                case R.id.navigation_favorite:
                    viewPager.setCurrentItem(3);
                    return true;
                case R.id.navigation_profile:
                    viewPager.setCurrentItem(4);
                    return true;
            }
            return false;
        }
    });

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            if (prevMenuItem != null) {
                prevMenuItem.setChecked(false);
            } else {
                navigation.getMenu().getItem(0).setChecked(false);
            }
            navigation.getMenu().getItem(position).setChecked(true);
            prevMenuItem = navigation.getMenu().getItem(position);

            if (viewPager.getCurrentItem() == 1) {
                toolbar.setTitle(getResources().getString(R.string.title_nav_category));
            } else if (viewPager.getCurrentItem() == 2) {
                toolbar.setTitle(getResources().getString(R.string.title_nav_video));
            } else if (viewPager.getCurrentItem() == 3) {
                toolbar.setTitle(getResources().getString(R.string.title_nav_favorite));
            } else if (viewPager.getCurrentItem() == 4) {
                toolbar.setTitle(getResources().getString(R.string.title_nav_favorite));
            } else {
                toolbar.setTitle(R.string.app_name);
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });

    if (Config.ENABLE_RTL_MODE) {
        viewPager.setRotationY(180);
    }

    broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            // checking for type intent filter
            if (intent.getAction().equals(Constant.REGISTRATION_COMPLETE)) {
                // now subscribe to global topic to receive app wide notifications
                FirebaseMessaging.getInstance().subscribeToTopic(Constant.TOPIC_GLOBAL);

            } else if (intent.getAction().equals(Constant.PUSH_NOTIFICATION)) {
                // new push notification is received
                String message = intent.getStringExtra("message");
                Toast.makeText(getApplicationContext(), "Push notification: " + message, Toast.LENGTH_LONG).show();
            }
        }
    };

    Intent intent = getIntent();
    final String message = intent.getStringExtra("message");
    final String imageUrl = intent.getStringExtra("image");
    final long nid = intent.getLongExtra("id", 0);
    final String link = intent.getStringExtra("link");

    if (message != null) {

        LayoutInflater layoutInflaterAndroid = LayoutInflater.from(MainActivity.this);
        View mView = layoutInflaterAndroid.inflate(R.layout.custom_dialog_notif, null);

        final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
        alert.setView(mView);

        final TextView notification_title = mView.findViewById(R.id.news_title);
        final TextView notification_message = mView.findViewById(R.id.news_message);
        final ImageView notification_image = mView.findViewById(R.id.news_image);

        if (imageUrl.endsWith(".jpg") || imageUrl.endsWith(".jpeg") || imageUrl.endsWith(".png") || imageUrl.endsWith(".gif")) {
            notification_title.setText(message);
            notification_message.setVisibility(View.GONE);
            Picasso.with(MainActivity.this)
                    .load(imageUrl.replace(" ", "%20"))
                    .placeholder(R.drawable.ic_thumbnail)
                    .resize(200, 200)
                    .centerCrop()
                    .into(notification_image);

            alert.setPositiveButton(R.string.dialog_read_more, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Intent intent = new Intent(getApplicationContext(), ActivityNotificationDetail.class);
                    intent.putExtra("id", nid);
                    startActivity(intent);
                }
            });
            alert.setNegativeButton(R.string.dialog_dismiss, null);

        } else {
            notification_title.setText(getResources().getString(R.string.app_name));

            notification_message.setVisibility(View.VISIBLE);
            notification_message.setText(message);

            notification_image.setVisibility(View.GONE);

            //Toast.makeText(getApplicationContext(), "link : " + link, Toast.LENGTH_SHORT).show();

            if (!link.equals("")) {
                alert.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Intent open = new Intent(Intent.ACTION_VIEW, Uri.parse(link));
                        startActivity(open);
                    }
                });
                alert.setNegativeButton(R.string.dialog_dismiss, null);
            } else {
                alert.setPositiveButton(R.string.dialog_ok, null);
            }
        }

        alert.setCancelable(false);
        alert.show();

    }

    GDPR.updateConsentStatus(this);

}

public class MyAdapter extends FragmentPagerAdapter {

    private MyAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0:
                return new FragmentRecent();
            case 1:
                return new FragmentCategory();
            case 2:
                return new FragmentVideo();
            case 3:
                return new FragmentFavorite();
            case 4:
                return new FragmentProfile();
        }
        return null;
    }

    @Override
    public int getCount() {
        return pager_number;
    }

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
    switch (menuItem.getItemId()) {

        case R.id.search:
            Intent intent = new Intent(getApplicationContext(), ActivitySearch.class);
            startActivity(intent);
            return true;

        default:
            return super.onOptionsItemSelected(menuItem);
    }
}

@Override
public void onBackPressed() {
    if (viewPager.getCurrentItem() != 0) {
        viewPager.setCurrentItem((0), true);
    } else {
        exitApp();
    }
}

public void exitApp() {
    if ((System.currentTimeMillis() - exitTime) > 2000) {
        Toast.makeText(this, getString(R.string.press_again_to_exit), Toast.LENGTH_SHORT).show();
        exitTime = System.currentTimeMillis();
    } else {
        finish();
    }
}

@Override
protected void onResume() {
    super.onResume();
}

private int getIndex(Spinner spinner, String myString){

    int index = 0;

    for (int i=0;i<spinner.getCount();i++){
        if (spinner.getItemAtPosition(i).equals(myString)){
            index = i;
        }
    }
    return index;
}

private void loadSpinnerData(String url) {
    RequestQueue requestQueue=Volley.newRequestQueue(getApplicationContext());
    StringRequest stringRequest=new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            try{
                JSONObject jsonObject=new JSONObject(response);

                if(jsonObject.getString("status").equals("ok")){
                    JSONArray jsonArray=jsonObject.getJSONArray("constituencies");

                    for(int i=0;i<jsonArray.length();i++){
                        JSONObject jsonObject1=jsonArray.getJSONObject(i);
                        String spinConstituency=jsonObject1.getString("constituency_name");
                        spinConstID = jsonObject1.getInt("const_id");
                        spinnerConstituencyName.add(spinConstituency);
                    }
                }

                ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(MainActivity.this,
                            R.layout.custom_spinner_item, spinnerConstituencyName){
                    @Override
                    public View getDropDownView(int position, View convertView,
                                                ViewGroup parent) {
                        View view = super.getDropDownView(position, convertView, parent);
                        TextView tv = (TextView) view;
                        if(position%2 == 1) {
                            // Set the item background color
                            tv.setBackgroundColor(Color.parseColor("#910D3F"));
                        }
                        else {
                            // Set the alternate item background color
                            tv.setBackgroundColor(Color.parseColor("#41061C"));
                        }
                        return view;
                    }
                };

                mySpinner.setPrompt("Select Your Constituency");
                myAdapter.setDropDownViewResource(R.layout.custom_spinner_item);
                mySpinner.setAdapter(myAdapter);

                //RECEIVE DATA VIA INTENT
                Intent i = getIntent();
                String name = i.getStringExtra("NAME_KEY");

                mySpinner.setSelection(getIndex(mySpinner, name));

            }catch (JSONException e){e.printStackTrace();}
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            error.printStackTrace();
        }
    });

    int socketTimeout = 30000;
    RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
    stringRequest.setRetryPolicy(policy);
    requestQueue.add(stringRequest);
}

}

Javamysqlandroidandroid-spinner

2条答案

按热度按时间
h6my8fg2

h6my8fg21#

下面是问题（关于微调器项选择）

Intent intent = getIntent();
                startActivity(intent);
                Toast.makeText(getApplicationContext(), mySpinner.getItemAtPosition(mySpinner.getSelectedItemPosition()).toString() + " Showing", Toast.LENGTH_SHORT).show();
                finish();

**您正在以“新建”和“完成当前活动”的形式启动当前活动，这意味着当您从微调器中选择任何项时，它将启动一个新活动，并且您的“创建”操作将反复执行，因此请放置其他逻辑，或者您可以使用在活动中发送值 intent.putextra() 并在oncreate中签入null，如果值不为null，则可以设置 spinner.setSelected(Your Position) . 对于你可以使用的片段

FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.detach(ComingSoonFragment.this).attach(ComingSoonFragment.this).commit();

刷新你的片段，传递你的数据和bundle并检查null如果你的bundle为null，那么使用你的代码进行defalt，如果不是null，那么根据你的id设置你的数据。

**

谢谢

赞(0）分享  回复(0）举报  2021-06-21
hm2xizp9

hm2xizp92#

在mselectedListener内的微调器中，使用parent.getitematposition（position）获取正确的值

mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

    Toast.makeText(parent.getContext(), 
    "OnItemSelectedListener : " + parent.getItemAtPosition(position).toString(),
    Toast.LENGTH_SHORT).show();

       //Do your staff here
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }

});
赞(0）分享  回复(0）举报  2021-06-20
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