Android上机实验-3 高级组件的使用

1. package com.example.myapplication02;
2. 
3. public class BasePerson {
4. private int icno;
5. private String title;
6. private String content;
7. 
8. public int getIcno() {
9. return icno;
10.     }
11. 
12. public void setIcno(int icno) {
13. this.icno = icno;
14.     }
15. 
16. public String getTitle() {
17. return title;
18.     }
19. 
20. public void setTitle(String title) {
21. this.title = title;
22.     }
23. 
24. public String getContent() {
25. return content;
26.     }
27. 
28. public void setContent(String content) {
29. this.content = content;
30.     }
31. }

1. package com.example.myapplication02;
2. 
3. import android.content.Context;
4. import android.view.View;
5. import android.view.ViewGroup;
6. import android.widget.BaseAdapter;
7. import android.widget.ImageView;
8. import android.widget.TextView;
9. import androidx.recyclerview.widget.RecyclerView;
10. import java.util.List;
11. 
12. public class BaseAdapterL extends BaseAdapter {
13. private List<BasePerson> PList;
14. private Context context;
15. private int LyId;
16. 
17. public BaseAdapterL(List<BasePerson> PList, Context context, int LyId) {
18. this.PList = PList;
19. this.context = context;
20. this.LyId = LyId;
21.     }
22. 
23. @Override
24. public int getCount() {
25. return PList.size();
26.     }
27. 
28. @Override
29. public Object getItem(int i) {
30. return null;
31.     }
32. 
33. @Override
34. public long getItemId(int i) {
35. return 0;
36.     }
37. 
38. @Override
39. public View getView(int i, View view, ViewGroup viewGroup) {
40. ViewHolder holder = null;
41. if (view == null){
42.             holder = new ViewHolder();
43.             view = View.inflate(context,LyId,null);
44.             holder.imageView = view.findViewById(R.id.imageView);
45.             holder.textView2 = view.findViewById(R.id.textView2);
46.             holder.textView = view.findViewById(R.id.textView);
47.             view.setTag(holder);
48.         }else {
49.             holder = (ViewHolder) view.getTag();
50.         }
51.         holder.imageView.setImageResource(PList.get(i).getIcno());
52.         holder.textView2.setText(PList.get(i).getTitle());
53.         holder.textView.setText(PList.get(i).getContent());
54. return view;
55.     }
56. class ViewHolder{
57.         ImageView imageView;
58.         TextView textView;
59.         TextView textView2;
60.     }
61. }

1. package com.example.myapplication02;
2. 
3. import android.os.Bundle;
4. import android.widget.ListView;
5. import androidx.appcompat.app.AppCompatActivity;
6. import java.util.ArrayList;
7. import java.util.List;
8. 
9. public class BaseMain extends AppCompatActivity {
10. private ListView lv;
11. private List<BasePerson> list=new ArrayList<>();
12. @Override
13. protected void onCreate(Bundle savedInstanceState) {
14. super.onCreate(savedInstanceState);
15.         setContentView(R.layout.larrayadapter);
16.         lv=findViewById(R.id.lv);
17. BasePerson BP1 = new BasePerson();
18.         BP1.setIcno(R.drawable.shangqiu01);
19.         BP1.setTitle("2023年3月30日");
20.         BP1.setContent("个人爱好：好好学习，天天向上！");
21. BasePerson BP2 = new BasePerson();
22.         BP2.setIcno(R.drawable.luoyang01);
23.         BP2.setTitle("2023年3月30日");
24.         BP2.setContent("洛阳老君山！洛阳老君山！洛阳老君山！洛阳老君山！");
25. BasePerson BP3 = new BasePerson();
26.         BP3.setIcno(R.drawable.kaifeng01);
27.         BP3.setTitle("2023年3月30日");
28.         BP3.setContent("开封清明上河园！开封清明上河园！开封清明上河园！");
29. BasePerson BP4 = new BasePerson();
30.         BP4.setIcno(R.drawable.luoyang01);
31.         BP4.setTitle("2023年3月30日");
32.         BP4.setContent("洛阳老君山！洛阳老君山！洛阳老君山！洛阳老君山！");
33. BasePerson BP5 = new BasePerson();
34.         BP5.setIcno(R.drawable.kaifeng01);
35.         BP5.setTitle("2023年3月30日");
36.         BP5.setContent("开封清明上河园！开封清明上河园！开封清明上河园！");
37.         list.add(BP1);
38.         list.add(BP2);
39.         list.add(BP3);
40.         list.add(BP4);
41.         list.add(BP5);
42.         BaseAdapterL adapter1=new BaseAdapterL(list,BaseMain.this,R.layout.listadapter);
43.         lv.setAdapter(adapter1);
44.     }
45. }

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="match_parent"
4. android:layout_height="match_parent"
5. android:background="@drawable/p01">
6. 
7. <ListView
8. android:id="@+id/lv"
9. android:layout_width="match_parent"
10. android:layout_height="wrap_content"
11. android:entries="@array/son_name"></ListView>
12. </LinearLayout>

1. <?xml version="1.0" encoding="utf-8"?>
2. <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. xmlns:app="http://schemas.android.com/apk/res-auto"
4. xmlns:tools="http://schemas.android.com/tools"
5. android:layout_width="match_parent"
6. android:layout_height="match_parent">
7. 
8. <ImageView
9. android:id="@+id/imageView"
10. android:layout_width="115dp"
11. android:layout_height="92dp"
12. android:layout_margin="10dp"
13. android:adjustViewBounds="true"
14. android:maxWidth="100dp"
15. android:maxHeight="100dp"
16. app:layout_constraintBottom_toBottomOf="parent"
17. app:layout_constraintStart_toStartOf="parent"
18. app:layout_constraintTop_toTopOf="parent"
19. app:srcCompat="@drawable/kaifeng01" />
20. 
21. <TextView
22. android:id="@+id/textView"
23. android:layout_width="262dp"
24. android:layout_height="54dp"
25. android:layout_margin="10dp"
26. android:layout_marginStart="24dp"
27. android:text="TextView"
28. android:textSize="20dp"
29. app:layout_constraintBottom_toBottomOf="@+id/imageView"
30. app:layout_constraintEnd_toEndOf="parent"
31. app:layout_constraintHorizontal_bias="1.0"
32. app:layout_constraintStart_toEndOf="@+id/imageView"
33. app:layout_constraintTop_toTopOf="@+id/imageView"
34. app:layout_constraintVertical_bias="0.0" />
35. 
36. <TextView
37. android:id="@+id/textView2"
38. android:layout_width="126dp"
39. android:layout_height="19dp"
40. android:layout_marginStart="128dp"
41. android:text="TextView"
42. android:textSize="18dp"
43. app:layout_constraintBottom_toBottomOf="@+id/imageView"
44. app:layout_constraintEnd_toEndOf="parent"
45. app:layout_constraintStart_toEndOf="@+id/imageView"
46. app:layout_constraintTop_toBottomOf="@+id/textView"
47. app:layout_constraintVertical_bias="1.0" />
48. </androidx.constraintlayout.widget.ConstraintLayout>