练习：显示有关每次地震的详细信息

app/src/main/java/com/example/quakereport/Earthquake.java

@@ -0,0 +1,25 @@
+package com.example.quakereport;
+
+public class Earthquake {
+    private String mag;
+    private String place;
+    private String time;
+
+    public String getMag() {
+        return mag;
+    }
+
+    public String getPlace() {
+        return place;
+    }
+
+    public String getTime() {
+        return time;
+    }
+
+    public Earthquake(String mag, String place, String time) {
+        this.mag = mag;
+        this.place = place;
+        this.time = time;
+    }
+}

app/src/main/java/com/example/quakereport/EarthquakeActivity.java

@@ -33,21 +33,24 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.earthquake_activity);
 
         // Create a fake list of earthquake locations.
-        ArrayList<String> earthquakes = new ArrayList<>();
-        earthquakes.add("San Francisco");
-        earthquakes.add("London");
-        earthquakes.add("Tokyo");
-        earthquakes.add("Mexico City");
-        earthquakes.add("Moscow");
-        earthquakes.add("Rio de Janeiro");
-        earthquakes.add("Paris");
+        ArrayList<Earthquake> earthquakes = new ArrayList<>();
+        earthquakes.add(new Earthquake("4.6", "Fiji region", "Jan 19, 2021"));
+        earthquakes.add(new Earthquake("4.5", "70 km NNE of Hihifo, Tonga", "Jan 19, 2021"));
+        earthquakes.add(new Earthquake("4.7", "74 km SE of Lebedinyy, Russia", "Jan 18, 2021"));
+        earthquakes.add(new Earthquake("5.2", "South Sandwich Islands region", "Jan 17, 2021"));
+        earthquakes.add(new Earthquake("4.6", "Fiji region", "Jan 19, 2021"));
+        earthquakes.add(new Earthquake("4.5", "70 km NNE of Hihifo, Tonga", "Jan 19, 2021"));
+        earthquakes.add(new Earthquake("4.7", "74 km SE of Lebedinyy, Russia", "Jan 18, 2021"));
+        earthquakes.add(new Earthquake("5.2", "South Sandwich Islands region", "Jan 17, 2021"));
+        earthquakes.add(new Earthquake("4.6", "Fiji region", "Jan 19, 2021"));
+        earthquakes.add(new Earthquake("4.5", "70 km NNE of Hihifo, Tonga", "Jan 19, 2021"));
+        earthquakes.add(new Earthquake("4.7", "74 km SE of Lebedinyy, Russia", "Jan 18, 2021"));
 
         // Find a reference to the {@link ListView} in the layout
         ListView earthquakeListView = (ListView) findViewById(R.id.list);
 
         // Create a new {@link ArrayAdapter} of earthquakes
-        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
-                this, android.R.layout.simple_list_item_1, earthquakes);
+        EarthquakeAdapter adapter = new EarthquakeAdapter(this, earthquakes);
 
         // Set the adapter on the {@link ListView}
         // so the list can be populated in the user interface

app/src/main/java/com/example/quakereport/EarthquakeAdapter.java

@@ -0,0 +1,53 @@
+package com.example.quakereport;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.util.List;
+
+public class EarthquakeAdapter extends ArrayAdapter<Earthquake> {
+
+    public EarthquakeAdapter(@NonNull Context context, @NonNull List<Earthquake> objects) {
+        super(context, 0, objects);
+    }
+
+    @NonNull
+    @Override
+    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
+        View itemView = convertView;
+        Earthquake earthquake;
+        ViewHolder holder;
+
+        if (null == itemView) {
+            itemView = LayoutInflater.from(getContext()).inflate(R.layout.earthquake_item, null);
+            holder = new ViewHolder();
+            holder.tvMag = itemView.findViewById(R.id.mag_text);
+            holder.tvPlace = itemView.findViewById(R.id.place_text);
+            holder.tvTime = itemView.findViewById(R.id.time_text);
+            itemView.setTag(holder);
+        } else {
+            holder = (ViewHolder) itemView.getTag();
+        }
+
+        earthquake = getItem(position);
+
+        holder.tvMag.setText(earthquake.getMag());
+        holder.tvPlace.setText(earthquake.getPlace());
+        holder.tvTime.setText(earthquake.getTime());
+
+        return itemView;
+    }
+
+    private static class ViewHolder {
+        private TextView tvMag;
+        private TextView tvPlace;
+        private TextView tvTime;
+    }
+}

app/src/main/res/layout/earthquake_item.xml

@@ -0,0 +1,31 @@
+<?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="wrap_content"
+    android:orientation="horizontal"
+    android:padding="@dimen/dp_16">
+
+    <TextView
+        android:id="@+id/mag_text"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        tools:text="8.0" />
+
+    <TextView
+        android:id="@+id/place_text"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="3"
+        tools:text="Wenchuan Sichuan" />
+
+    <TextView
+        android:id="@+id/time_text"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="2"
+        android:gravity="right"
+        tools:text="May 12, 2008" />
+
+</LinearLayout>