Android简易电话簿

修改应用图标

打开AndroidManifest.xml，修改icon为minmip下保存的图标

记录登录次数

通过SharedPreferences保存一个变量count记录登录次数,每当进入一次电话簿时，count加1并显示到屏幕上

//记录登录次数
    private void login(){
        SharedPreferences sharedPreferences = getSharedPreferences("count",MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        //如果要寻找的变量不存在，那么就创建它，并且默认值
        int count = sharedPreferences.getInt("count",1);
        textView.setText("你好！先生，欢迎你的第"+count+"次登录，谢谢！");
        //每登录一次，count就加1
        editor.putInt("count",++count);
        editor.commit();//每次进行数据修改，都要执行commit()方法，提交已修改的结果
    }

修改联系人信息

通过listview绑定setOnItemClickListener，当点击某一个联系人时，弹出联系人的详细信息。修改信息，点击保存，信息更新。

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
                //自定义对话框，显示联系人详情
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                View view1 = View.inflate(MainActivity.this,R.layout.activity_contact_detail,null);
                //为对话框设置自定义的视图
                builder.setView(view1);
                //绑定控件
                ImageView imageView = view1.findViewById(R.id.imageView);
                final EditText editText1 = view1.findViewById(R.id.editText1);
                final EditText editText2 = view1.findViewById(R.id.editText2);
                final EditText editText3 = view1.findViewById(R.id.editText3);
                imageView.setImageResource((Integer) list.get(position).getImage());
                editText1.setText((String) list.get(position).getName());
                editText2.setText((String) list.get(position).getPhone());
                editText3.setText((String) list.get(position).getAddress());
                //添加按钮
                builder.setPositiveButton("保存", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        list.get(position).setName(editText1.getText().toString());
                        list.get(position).setPhone(editText2.getText().toString());
                        list.get(position).setAddress(editText3.getText().toString());
                        //更新数据
                        adapter.notifyDataSetChanged();
                        Toast.makeText(MainActivity.this,"修改信息成功！",Toast.LENGTH_SHORT).show();
                    }
                });
                builder.setNegativeButton("返回",null);
                //显示对话框
                builder.create().show();
            }
        });

删除联系人

通过listview绑定setOnItemLongClickListener，长按某一联系人，提示是否删除联系人

listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
               new AlertDialog.Builder(MainActivity.this).setTitle("提示")
                       .setMessage("你确定要删除 "+list.get(position).getName()+" 吗！")
                       .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                           @Override
                           public void onClick(DialogInterface dialog, int which) {
                               //将要删除的联系人的信息从list中移除
                               list.remove(position);
                               //更新数据
                                adapter.notifyDataSetChanged();
                                Toast.makeText(MainActivity.this,"删除成功！",Toast.LENGTH_SHORT).show();
                           }
                       })
                       .setNegativeButton("取消",null).create().show();
                /*
                因为android默认的优先响应ItemClickListener，所以当返回值为false时，
                ItemLongClickListener和ItemClickListener都会响应点击事件，因此应该
                返回true，提高ItemLongClickListener响应的优先级。
                */
               return true;
            }
        });

完整代码

定义联系人的类

public class Person {
    private Object image;
    private String name;
    private String phone;
    private String address;
    public Person(Object image,String name,String phone,String address){
        this.image = image;
        this.name = name;
        this.phone = phone;
        this.address = address;
    }

    public Object getImage() {
        return image;
    }

    public void setImage(Object image) {
        this.image = image;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

主界面

public class MainActivity extends AppCompatActivity {
    private List<Person> list;
    private ListView listView;
    private TextView textView;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = findViewById(R.id.listView);
        textView = findViewById(R.id.textView);
        //记录登录次数
        login();
        list = new ArrayList<>();
        //new四位联系人
       list.add(new Person(R.mipmap.guanyin,"观音","123","天庭"));
        list.add(new Person(R.mipmap.sunwukong,"悟空","234","花果山"));
        list.add(new Person(R.mipmap.tangseng,"唐僧","345","大唐"));
        list.add(new Person(R.mipmap.zhubajie,"八戒","456","高老庄"));
        //使用自定义适配器
        final CustomAdapter adapter = new CustomAdapter(this,list);
        listView.setAdapter(adapter);
        //设置监听器，当点击联系人列表的每一行时，显示联系人的详细信息
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
                //自定义对话框，显示联系人详情
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                View view1 = View.inflate(MainActivity.this,R.layout.activity_contact_detail,null);
                //为对话框设置自定义的视图
                builder.setView(view1);
                //绑定控件
                ImageView imageView = view1.findViewById(R.id.imageView);
                final EditText editText1 = view1.findViewById(R.id.editText1);
                final EditText editText2 = view1.findViewById(R.id.editText2);
                final EditText editText3 = view1.findViewById(R.id.editText3);
                imageView.setImageResource((Integer) list.get(position).getImage());
                editText1.setText((String) list.get(position).getName());
                editText2.setText((String) list.get(position).getPhone());
                editText3.setText((String) list.get(position).getAddress());
                //添加按钮
                builder.setPositiveButton("保存", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        list.get(position).setName(editText1.getText().toString());
                        list.get(position).setPhone(editText2.getText().toString());
                        list.get(position).setAddress(editText3.getText().toString());
                        //更新数据
                        adapter.notifyDataSetChanged();
                        Toast.makeText(MainActivity.this,"修改信息成功！",Toast.LENGTH_SHORT).show();
                    }
                });
                builder.setNegativeButton("返回",null);
                //显示对话框
                builder.create().show();
            }
        });
        //当长时间点击时，弹出对话框，提示是否要删除联系人
        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
               new AlertDialog.Builder(MainActivity.this).setTitle("提示")
                       .setMessage("你确定要删除 "+list.get(position).getName()+" 吗！")
                       .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                           @Override
                           public void onClick(DialogInterface dialog, int which) {
                               //将要删除的联系人的信息从list中移除
                               list.remove(position);
                               //更新数据
                                adapter.notifyDataSetChanged();
                                Toast.makeText(MainActivity.this,"删除成功！",Toast.LENGTH_SHORT).show();
                           }
                       })
                       .setNegativeButton("取消",null).create().show();
                /*
                因为android默认的优先响应ItemClickListener，所以当返回值为false时，
                ItemLongClickListener和ItemClickListener都会响应点击事件，因此应该
                返回true，提高ItemLongClickListener响应的优先级。
                */
               return true;
            }
        });
    }
    //记录登录次数
    private void login(){
        SharedPreferences sharedPreferences = getSharedPreferences("count",MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        //如果要寻找的变量不存在，那么就创建它，并且默认值
        int count = sharedPreferences.getInt("count",1);
        textView.setText("你好！先生，欢迎你的第"+count+"次登录，谢谢！");
        //每登录一次，count就加1
        editor.putInt("count",++count);
        editor.commit();//每次进行数据修改，都要执行commit()方法，提交已修改的结果
    }
}

通过重写BaseAdapter里的方法，实现自定义的adapter

public class CustomAdapter extends BaseAdapter {
    private Context context;
    private List<Person> list;
    public CustomAdapter(Context context,List<Person> list){
        this.context = context;
        this.list = list;
    }
    @Override
    //列表的长度
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    //获取每一行的view
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewItems viewItems = null;
        if (convertView == null){
            viewItems = new ViewItems();
            //获取自定义的布局
            convertView = LayoutInflater.from(context).inflate(R.layout.activity_contact_person,null);
            viewItems.imageView = convertView.findViewById(R.id.imageView);
            viewItems.textView = convertView.findViewById(R.id.textView);
            convertView.setTag(viewItems);
        }else {
            //如果布局不为空，直接使用getTag()获取
            viewItems = (ViewItems) convertView.getTag();
        }
        //为控件设置内容
        viewItems.imageView.setImageResource((Integer) list.get(position).getImage());
        viewItems.textView.setText((String) list.get(position).getName());
        return convertView;
    }
    //每一行所使用的控件
    public static class ViewItems{
        private ImageView imageView;
        private TextView textView;
    }
}

主界面布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/listView"
        android:layout_width="417dp"
        android:layout_height="624dp"
        android:layout_marginTop="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:textColor="@color/colorAccent"
        android:textSize="20sp"
        app:layout_constraintBottom_toTopOf="@+id/listView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.21" />
</androidx.constraintlayout.widget.ConstraintLayout>

联系人列表布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="409dp"
        android:layout_height="0dp"
        android:gravity="center"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            app:srcCompat="@mipmap/ic_launcher" />

        <TextView
            android:id="@+id/textView"
            android:layout_marginLeft="20sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:textColor="@color/colorPrimary"
            android:textSize="22sp" />
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

自定义对话框的布局，显示联系人详细信息

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:text="个人信息"
        android:textSize="25sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.194"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:srcCompat="@mipmap/ic_launcher" />

    <LinearLayout
        android:layout_width="311dp"
        android:layout_height="201dp"
        android:layout_marginStart="1dp"
        android:layout_marginLeft="1dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="1dp"
        android:layout_marginRight="1dp"
        android:orientation="vertical"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal" >

            <TextView
                android:id="@+id/textView3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:textSize="20sp"
                android:text="姓名" />

            <EditText
                android:id="@+id/editText1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="18dp"
                android:layout_weight="1"
                android:ems="10"
                android:inputType="textEmailAddress" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView4"
                android:layout_width="wrap_content"
                android:textSize="20sp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="电话" />

            <EditText
                android:id="@+id/editText2"
                android:layout_width="wrap_content"
                android:textSize="18dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:inputType="phone" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:layout_weight="1"
                android:text="地址" />

            <EditText
                android:id="@+id/editText3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="18dp"
                android:layout_weight="1"
                android:ems="10"
                android:inputType="textPostalAddress" />

        </LinearLayout>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>