Question

我编写了我的应用程序以使用listview，我创建了我的addapter类来扩展ArrayAddapter，并且我创建了我的getter类，以便将我的文字放入我想要膨胀的视图中，但是当我运行应用程序时它会停止。

我的addapter类代码

package charpman.com.quakereport;

import android.content.Context;
import android.graphics.Typeface;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by DCharpMan on 4/19/2017.
 * <p>
 * class to populate each list view item
 */

public class QuakeAdapter extends ArrayAdapter<earthquakeClass> {


    /**
     * Constructor
     *
     * @param context         The current context.
     * @param earthquakeClass the array to be populated
     */
    public QuakeAdapter(@NonNull Context context, ArrayList<earthquakeClass> earthquakeClass) {
        super(context, R.layout.description_house, earthquakeClass);
    }


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

        View Customize = convertView;
        if (Customize == null) {
            Customize = LayoutInflater.from(getContext()).inflate(R.layout.description_house, parent, false);
        }
        earthquakeClass earthquakeClass = getItem(position);

        TextView textView = (TextView) Customize.findViewById(R.id.text_magnitude);
        textView.setText(earthquakeClass.getMagnitude());
        textView.setTypeface(Typeface.MONOSPACE, 2 + 1);


        TextView textView1 = (TextView) Customize.findViewById(R.id.text_loctaion);
        textView1.setText(earthquakeClass.getLocation());
        textView1.setTypeface(Typeface.SERIF, 1);

        TextView textView2 = (TextView) Customize.findViewById(R.id.text_daye);
        textView2.setText(earthquakeClass.getDate());
        textView2.setTypeface(Typeface.DEFAULT_BOLD, 3);


        return Customize;

    }

}

我的mainActivity.java代码

package charpman.com.quakereport;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

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


        final ArrayList<earthquakeClass> country = new ArrayList<earthquakeClass>();

        country.add(new earthquakeClass("7.2", "nigeria", "23,07,2017"));
        country.add(new earthquakeClass("7.2", "nigeria", "23,07,2017"));
        country.add(new earthquakeClass("7.2", "nigeria", "23,07,2017"));
        country.add(new earthquakeClass("7.2", "nigeria", "23,07,2017"));
        country.add(new earthquakeClass("7.2", "nigeria", "23,07,2017"));


        ListView listView = (ListView) findViewById(R.id.list_view);

        QuakeAdapter quakeAdapter = new QuakeAdapter(this, country);


        listView.setAdapter(quakeAdapter);

    }
}

我的getter类代码

package charpman.com.quakereport;

/**
 * Created by CharpMan on 4/19/2017.
 * class to get the earthQuake details
 * details includes Magnitude,location and date of earthquake
 */

public class earthquakeClass {

    // globale variables that holds the earthquake information
    String magnitude;
    String location;
    String date;

    //contructor for the class takes in three params
    // @param Magnitude tell the magnitude of the quake
    // @params Location tells the location where the quake occured
    // @params date tells the day of the quake
    public  earthquakeClass(String Magnitude, String Location, String Date){
        magnitude = Magnitude;
        location = Location;
        date = Date;

    }

    // create public methods that returns each information

    // method to the the magnitude
    public  String getMagnitude(){
        return magnitude;
    }

    // methid to return the loctaion
    public  String getLocation(){
        return  location;
    }

    // methid to return the day of quake occurence

    public String getDate (){
        return date;
    }



}

我的MainActivity.xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="charpman.com.quakereport.MainActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:background="@android:color/darker_gray"
        android:orientation="horizontal">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:paddingLeft="10dp"
            android:text="Magnitude"
            android:textAllCaps="true" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:paddingLeft="10dp"
            android:text="Location"
            android:textAllCaps="true" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:paddingLeft="20dp"
            android:text="date"
            android:textAllCaps="true" />

    </LinearLayout>


    <ListView
      android:background="@android:color/secondary_text_light"
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </ListView>



</LinearLayout>

我在Addapter类的GetView方法中膨胀的布局的xml代码

<?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:orientation="vertical"
    android:padding="10dp">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">


        <TextView
            android:id="@+id/text_magnitude"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@android:color/white"
            android:paddingLeft="14dp"
            android:text="7.8" />


        <TextView
            android:id="@+id/text_loctaion"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@android:color/white"
            android:gravity="center"
            android:paddingLeft="5dp"
            android:text="Nigeria"
            android:typeface="serif" />


        <TextView
            android:id="@+id/text_daye"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_weight="1"
            android:background="@android:color/white"
            android:paddingLeft="25dp"
            android:text="28,02,2017" />


    </LinearLayout>


</LinearLayout>

我包含了我的logcat

的屏幕截图

Answer 1

我试图阅读代码，我注意到我的ListView代码中添加了一个背景标签

机器人：背景= “@机器人：颜色/ secondary_text_light”

我应该在项目colors.xml中定义/复制颜色代码并使用它。感谢

Answer 2

根据错误日志，我认为在您的XML文件中存在根据您的适配器不兼容的东西，或者您在适配器中使用了XML文件中不存在的对象。

应用程序崩溃 - 我的Android应用程序

2 个答案: