从其他活动以动态方式将项目添加到多行ListView

时间：2016-05-24 17:43:44

标签： android listview android-fragments

我正在和朋友一起申请，我们有点卡住了。我有alredy设法有一个多行LisView和香港专业教育学院为它做了一个自定义适配器。这个应用程序所做的是从其他活动注册汽车，当点击提交按钮时，我们想要从汽车中添加3个项目到我们在选项卡式活动中的ListView。我已经尝试了一些使用Intent和Bundle的东西来获取信息然后把它放进去，但是它给出了一个空错误。

这是我的项目，直到现在：

MainActivity： 

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity extends AppCompatActivity {



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

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(MainActivity.this, CarType.class);
            MainActivity.this.startActivity(intent);


        }
    });

    // Get the ViewPager and set it's PagerAdapter so that it can display items
    ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
    viewPager.setAdapter(new SampleFragmentPageAdapter(getSupportFragmentManager(),
            MainActivity.this));

    // Give the TabLayout the ViewPager
    TabLayout tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
    tabLayout.setupWithViewPager(viewPager);

    tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            Fragment fragment = null;
            if(tab.getPosition()==0) {

                PageFragment pageFragment = new PageFragment();
                getSupportFragmentManager().beginTransaction().replace(R.id.container, pageFragment ).commit();
            }
            if(tab.getPosition()==1){
                SecondPageFragment secondPageFragment = new SecondPageFragment();
                getSupportFragmentManager().beginTransaction().replace(R.id.container,secondPageFragment).commit();

            }
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });
}

}

页面片段： 

import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

public class PageFragment extends ListFragment {

String[] cars ;
String[] modelo ;
String[] placas ;


public static final String ARG_PAGE = "ARG_PAGE";

private int mPage;

public static PageFragment newInstance(int page) {
    Bundle args = new Bundle();
    args.putInt(ARG_PAGE, page);
    PageFragment fragment = new PageFragment();
    fragment.setArguments(args);
    return fragment;
}


public PageFragment() {


}

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


}

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    Bundle intent = getActivity().getIntent().getExtras();



        cars = new String[]{intent.getString("marca")};
        modelo = new String[]{intent.getString("modelo")};
        placas = new String[]{intent.getString("placas")};



    View view = inflater.inflate(R.layout.activity_page_fragment, container, false);
    Adapter adapter = new Adapter(getActivity(), cars, modelo, placas);
    ListView listView = (ListView) view.findViewById(android.R.id.list);
    listView.setAdapter(adapter);

    return view;
}
}

适配器： 

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;


public class Adapter extends ArrayAdapter<String> {

String [] cars ;
String [] modelo ;
String [] placas ;
Context c;
LayoutInflater inflater;


public Adapter(Context context, String[] cars, String[] modelo, String[] placas){
    super(context, R.layout.single_row, cars);

    this.c=context;
    this.cars=cars;
    this.modelo=modelo;
    this.placas=placas;



}

public class ViewHolder{
    TextView cars;
    TextView model;
    TextView placas;


}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if(convertView == null){

        inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView=inflater.inflate(R.layout.single_row,null);

    }

    final ViewHolder holder = new ViewHolder();
    holder.cars=(TextView)convertView.findViewById(R.id.textView2);
    holder.model=(TextView)convertView.findViewById(R.id.textView3);
    holder.placas=(TextView)convertView.findViewById(R.id.textView4);

    holder.cars.setText(cars[position]);

    holder.model.setText(modelo[position]);
    holder.placas.setText(placas[position]);

    return convertView;
}
}

CarType：这是我想要将信息传递到列表视图的形式

import android.app.AlertDialog;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.*;

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

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

import java.io.File;

public class CarType extends AppCompatActivity {

ImageButton androidImageButton;
ImageView imageView;
static final int CAM_REQUEST = 1;



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

    final EditText etMarca = (EditText)findViewById(R.id.etMarca);
    final EditText etModelo = (EditText)findViewById(R.id.etModelo);
    final EditText etPlacas = (EditText)findViewById(R.id.etPlacas);
    final EditText etColor = (EditText)findViewById(R.id.etColor);
    final CheckBox cbCamioneta = (CheckBox)findViewById(R.id.cbCamioneta);
    final CheckBox cbCar = (CheckBox)findViewById(R.id.cbCar);
    final boolean checkStatus = cbCamioneta.isChecked();



    Button bSubmit = (Button)findViewById(R.id.bSubmit);


    assert bSubmit != null;
    bSubmit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent intent = new Intent(getApplicationContext(), Adapter.class);
            intent.putExtra("marca", etMarca.getText().toString());
            intent.putExtra("modelo", etModelo.getText().toString());
            intent.putExtra("placas", etPlacas.getText().toString());
            intent.putExtra("color", etColor.getText().toString());
            intent.putExtra("camioneta", cbCamioneta.getText().toString());
            intent.putExtra("car", cbCar.getText().toString());
            intent.putExtra("checkboxstatus", checkStatus);

            startActivity(intent);


            final String modelo = etModelo.getText().toString();
            final String marca = etMarca.getText().toString();
            final String placas = etPlacas.getText().toString();
            final String color = etColor.getText().toString();

            Response.Listener<String> responseListener = new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonResponse = new JSONObject(response);
                        boolean success = jsonResponse.getBoolean("success");
                        if (success) {
                            Intent intent = new Intent(CarType.this, MainActivity.class);
                            CarType.this.startActivity(intent);
                        } else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(CarType.this);
                            builder.setMessage("Register Failed")
                                    .setNegativeButton("Retry", null)
                                    .create()
                                    .show();
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            };

            CarRegisterRequest carregisterRequest = new CarRegisterRequest(marca, modelo, placas, color, responseListener);
            RequestQueue queue = Volley.newRequestQueue(CarType.this);
            queue.add(carregisterRequest);

        }
    });

    androidImageButton = (ImageButton) findViewById(R.id.image_button_android);
    imageView = (ImageView) findViewById(R.id.Final_picture);
    androidImageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent camera_intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            File file = getFile();
            camera_intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
            startActivityForResult(camera_intent, CAM_REQUEST);
        }
    });
}



private File getFile(){
    File folder = new File ("sdcard/camera_app");

    if (!folder.exists()){
        folder.mkdir();
    }
    File image_file = new File(folder, "cam_image.jpg");
    return image_file;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    String path = "sdcard/camera_app/cam_image.jpg";
    imageView.setImageDrawable(Drawable.createFromPath(path));
}

}

在此之后，我的页面片段的xml文件只包含一个ListView，我有一个＆＃34; single_row.xml＆＃34;其中的格式是多行ListView。

任何帮助都将非常感激，我对Android和本网站都很陌生，所以如果我没有直接得到答案，我会道歉。

非常感谢。

1 个答案:

答案 0 :(得分：0)

活动在android中如何沟通非常容易

在您开始结果活动时，您需要startActivityForResult(intent, requestCode) MainActivity，您需要在同一个活动（MainActivity）中等待结果，然后您将获得导致您的onActivityResult(int requestCode, int resultCode, Intent data)以及该意图中的所有数据。

public class MainActivity extends AppCompatActivity {

    private static final int RQ_CAR = 1;
    ....


        ....
        // Open the second activity
        Intent intent = new Intent(MainActivity.this, CarType.class);
        startActivityForResult(intent, RQ_CAR);
        ....


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == RQ_CAR && resultCode == Activity.RESULT_OK) {
            Bundle bundle = data.getExtras();
            // Extract data and do whatever you want
        }
    }

}

但是我可以在哪里分配意图中的Bundle并将resultCode设置为OK？

在您的第二个活动（CarType）中，您需要手动执行此操作

Intent intent = new Intent();
Bundle extras = new Bundle();
extras.put....(); // put all your data here
intent.putExtras(extras);
setResult(Activity.RESULT_OK, intent);
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