实验四的界面是图书查询界面Ss.
java类代码：
import static com.example.myapplication.R.id.tt_hg;
import
android.content.
Intent;
import
android.content.SharedPreferences;
import
android.graphics.Color;
import
android.os.Bundle;
import
android.view.ContextMenu;
import
android.view.Menu;
import
android.view.MenuItem;
import
android.view.View;
import
android.widget.Button;
import
android.widget.EditText;
import
android.widget.LinearLayout;
import
android.widget.RadioButton;
import
android.widget.TableLayout;
import
android.widget.TableRow;
import
android.widget.Toast;
import
androidx.appcompat.app.AppCompat
Activity;
import
androidx.preference.PreferenceManager;
public class Ss extends AppCompat
Activity {
private EditText editId;
private EditText editName;
private EditText editAuthor;
private static final int item1 = Menu.FIRST;
private static final int item2 = Menu.FIRST + 1;
public void onResume(){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
String size = sp.getString("font_size","25");
EditText syqt = findViewById(R.id.edit_id);
syqt.setTextSize(Integer.valueOf(size));
EditText cxqt = findViewById(R.id.edit_name);
cxqt.setTextSize(Integer.valueOf(size));
EditText szqt = findViewById(R.id.edit_author);
szqt.setTextSize(Integer.valueOf(size));
RadioButton dfqt = findViewById(tt_hg);
dfqt.setTextSize(Integer.valueOf(size));
RadioButton dft = findViewById(R.id.tt_hu);
dft.setTextSize(Integer.valueOf(size));
Button dfttd = findViewById(R.id.btn_ff);
dfttd.setTextSize(Integer.valueOf(size));
Button dftqq = findViewById(R.id.btn_clar);
dftqq.setTextSize(Integer.valueOf(size));
Button dftww = findViewById(R.id.btn_back);
dftww.setTextSize(Integer.valueOf(size));
Button dftwwl = findViewById(R.id.ff_id1);
dftwwl.setTextSize(Integer.valueOf(size));
Button dftwws = findViewById(R.id.ff_id2);
dftwws.setTextSize(Integer.valueOf(size));
Button dftwwt = findViewById(R.id.ff_id3);
dftwwt.setTextSize(Integer.valueOf(size));
updateUI();
super.onResume();
}
private void updateUI() {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
String fontSize = sp.getString("font_size", "15");
int size = Integer.parseInt(fontSize);
String textColor = sp.getString("text_color", "#FF000000");
int color = Color.parseColor(textColor);
applyStyleToEditText(editId, size, color);
applyStyleToEditText(editName, size, color);
applyStyleToEditText(editAuthor, size, color);
}
private void applyStyleToEditText(EditText btn, int size, int color) {
btn.setTextSize(size);
btn.setTextColor(color);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ss);
// 初始化 EditText
editId = findViewById(R.id.edit_id);
editName = findViewById(R.id.edit_name);
editAuthor = findViewById(R.id.edit_author);//通过ID绑定视图对象
RadioButton ttHg = findViewById(R.id.tt_hg);
RadioButton ttHu = findViewById(R.id.tt_hu);
Button btnFf = findViewById(R.id.btn_ff);
LinearLayout ll = findViewById(R.id.table_layout);
registerForContextMenu(ll);
btnFf.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 在此处编写查询逻辑（示例：Toast提示）
// Toast.makeText(Ss.this, "查询按钮被点击，执行查询操作", Toast.LENGTH_SHORT).show();
}
});
// 1清空 - 属性事件响应（XML 按钮需添加
android:onClick="clearByAttribute"）
// 2清空 - 内部匿名类事件响应
findViewById(R.id.ff_id1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
clearFields();
}
});
// 3清空 - 监听器接口实现类事件响应
findViewById(R.id.ff_id2).setOnClickListener(new MyClickListener());
// 4清空 - 外部监听器接口实现类事件响应
findViewById(R.id.ff_id3).setOnClickListener(new ExternalClickListener(this));
Button btnBack = findViewById(R.id.btn_back);
btnBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new
Intent(Ss.this, Sy.class);
start
Activity(
intent);
finish();
}
});
}
// 1清空对应的属性事件响应方法
public void clearByAttribute(View view) {
clearFields();
}//当用户点击按钮就会被执行
// 清空文本框的公共方法
public void clearFields() {
if (editId != null) editId.setText("");
if (editName != null) editName.setText("");
if (editAuthor != null) editAuthor.setText("");
}
// 内部监听器接口实现类（3清空）
private class MyClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
clearFields();
}
}
// 外部监听器接口实现类（4清空）
@Override
public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo info) {
menu.add(0, 1, 0, "删除");
menu.add(0, 2, 0, "修改");
super.onCreateContextMenu(menu, view, info);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
if (item.getItemId() == 1) {
Toast.makeText(this, "您点击了删除", Toast.LENGTH_LONG).show();
} else if (item.getItemId() == 2) {
Toast.makeText(this, "您点击了修改", Toast.LENGTH_LONG).show();
}
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, item1, 0, "关于");
menu.add(0, item2, 0, "退出");
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case item1
:
Toast.makeText(Ss.this, "姓名：骆树涛。学号：2404224132", Toast.LENGTH_SHORT).show();
break;
case item2
:
this.finish();
break;
}
return true;
}
}
图书查询界面的ss.XML布局文件代码：
<?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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="图书编号"
android:textSize="20dp"/>
<EditText
android:id="@+id/edit_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="图书名称"
android:textSize="20dp"/>
<EditText
android:id="@+id/edit_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="图书作者"
android:textSize="20dp"/>
<EditText
android:id="@+id/edit_author"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="中文"
android:textSize="20dp"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="外文"
android:textSize="20dp"/>
</RadioGroup>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询"
android:textSize="20dp"/>
<Button
android:id="@+id/btn_clar"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="清空"
android:textSize="20dp"
android:onClick="clearByAttribute"/>
<Button
android:id="@+id/btn_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="返回"
android:textSize="20dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<Button
android:id="@+id/ff_id1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="清空"
android:textSize="20dp"/>
<Button
android:id="@+id/ff_id2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="清空"
android:textSize="20dp" />
<Button
android:id="@+id/ff_id3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="清空"
android:textSize="20dp"/>
</LinearLayout>
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:stretchColumns="*">
<TableRow>
<TextView
android:text="图书编号"
android:textSize="15dp"/>
<TextView
android:text="图书名称"
android:textSize="15dp"/>
<TextView
android:text="图书作者"
android:textSize="15dp"/>
<TextView
android:text="馆藏地点"
android:textSize="15dp"/>
</TableRow>
<TableRow
android:id="@+id/table_layout">
<TextView
android:text="10
01"
android:textSize="15dp"/>
<TextView
android:text="
Android"
android:textSize="15dp"/>
<TextView
android:text="张三"
android:textSize="15dp"/>
<TextView
android:text="5-423"
android:textSize="15dp"/>
</TableRow>
<TableRow>
<TextView
android:text="查询结果1条"
android:textSize="15dp"
android:layout_span="4"
android:layout_gravity="center"/>
</TableRow>
</TableLayout>
</LinearLayout>
实验六的代码如下
新增Xz.
JAVA类代码
import
android.content.
Intent;
import
android.content.SharedPreferences;
import
android.graphics.Color;
import
android.os.Bundle;
import
android.view.View;
import
android.widget.Button;
import
android.widget.EditText;
import
androidx.appcompat.app.AppCompat
Activity;
import
androidx.preference.PreferenceManager;
public class Xz extends AppCompat
Activity {
private EditText editBookId;
private EditText editBookName;
private EditText editBookAuthor;
private EditText editBookLocation;
public void onResume(){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
String size = sp.getString("font_size","25");
EditText syq = findViewById(R.id.edit_book_id);
syq.setTextSize(Integer.valueOf(size));
EditText cxq = findViewById(R.id.edit_book_name);
cxq.setTextSize(Integer.valueOf(size));
EditText szq = findViewById(R.id.edit_book_author);
szq.setTextSize(Integer.valueOf(size));
EditText dfq = findViewById(R.id.edit_book_location);
dfq.setTextSize(Integer.valueOf(size));
updateUI();
super.onResume();
}
private void updateUI() {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
String fontSize = sp.getString("font_size", "15");
int size = Integer.parseInt(fontSize);
String textColor = sp.getString("text_color", "#FF000000");
int color = Color.parseColor(textColor);
applyStyleToEditText(editBookId, size, color);
applyStyleToEditText(editBookName, size, color);
applyStyleToEditText(editBookAuthor, size, color);
applyStyleToEditText(editBookLocation, size, color);
}
private void applyStyleToEditText(EditText btn, int size, int color) {
btn.setTextSize(size);
btn.setTextColor(color);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.xz);
editBookId = findViewById(R.id.edit_book_id);
editBookName = findViewById(R.id.edit_book_name);
editBookAuthor = findViewById(R.id.edit_book_author);
editBookLocation = findViewById(R.id.edit_book_location);
Button btnAddBook = findViewById(R.id.btn_add_book);
btnAddBook.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String bookId = editBookId.getText().toString();
String bookName = editBookName.getText().toString();
String bookAuthor = editBookAuthor.getText().toString();
String bookLocation = editBookLocation.getText().toString();
Intent intent = new
Intent(Xz.this, Xq.class);
intent.putExtra("bookId", bookId);
intent.putExtra("bookName", bookName);
intent.putExtra("bookAuthor", bookAuthor);
intent.putExtra("bookLocation", bookLocation);
start
Activity(
intent);
}
});
}
}
新增的xz.XML布局文件代码
<?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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="图书编号"
android:textSize="20dp"/>
<EditText
android:id="@+id/edit_book_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="图书名称"
android:textSize="20dp"/>
<EditText
android:id="@+id/edit_book_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="图书作者"
android:textSize="20dp"/>
<EditText
android:id="@+id/edit_book_author"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="馆藏地点"
android:textSize="20dp"/>
<EditText
android:id="@+id/edit_book_location"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<Button
android:id="@+id/btn_add_book"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="新增"
android:textSize="20dp"
android:layout_gravity="center"/>
</LinearLayout>
详情Xq.
JAVA类代码
import
android.content.
Intent;
import
android.content.SharedPreferences;
import
android.graphics.Color;
import
android.os.Bundle;
import
android.view.ContextMenu;
import
android.view.Menu;
import
android.view.MenuItem;
import
android.view.View;
import
android.widget.EditText;
import
android.widget.TextView;
import
android.widget.Toast;
import
androidx.appcompat.app.AppCompat
Activity;
import
androidx.preference.PreferenceManager;
public class Xq extends AppCompat
Activity {
private static final int ITEM_HOME = Menu.FIRST;
public void onResume(){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
String size = sp.getString("font_size","25");
TextView syqw = findViewById(R.id.tv_book_id);
syqw.setTextSize(Integer.valueOf(size));
TextView cxqw = findViewById(R.id.tv_book_name);
cxqw.setTextSize(Integer.valueOf(size));
TextView szqw = findViewById(R.id.tv_book_author);
szqw.setTextSize(Integer.valueOf(size));
TextView dfqw = findViewById(R.id.tv_book_location);
dfqw.setTextSize(Integer.valueOf(size));
super.onResume();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.xq);
TextView tvBookId = findViewById(R.id.tv_book_id);
TextView tvBookName = findViewById(R.id.tv_book_name);
TextView tvBookAuthor = findViewById(R.id.tv_book_author);
TextView tvBookLocation = findViewById(R.id.tv_book_location);
Intent intent = get
Intent();
String bookId =
intent.getStringExtra("bookId");
String bookName =
intent.getStringExtra("bookName");
String bookAuthor =
intent.getStringExtra("bookAuthor");
String bookLocation =
intent.getStringExtra("bookLocation");
tvBookId.setText("图书编号：" + bookId);
tvBookName.setText("图书名称：" + bookName);
tvBookAuthor.setText("图书作者：" + bookAuthor);
tvBookLocation.setText("馆藏地点：" + bookLocation);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, ITEM_HOME, 0, "首页");
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case ITEM_HOME
:
Intent intent = new
Intent(Xq.this, Sy.class);
start
Activity(
intent);
finish();
return true;
default
:
return super.onOptionsItemSelected(item);
}
}
}
详情的xq.XML布局文件代码
<?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="16dp">
<TextView
android:id="@+id/tv_book_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
<TextView
android:id="@+id/tv_book_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
<TextView
android:id="@+id/tv_book_author"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
<TextView
android:id="@+id/tv_book_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
</LinearLayout>
首页Sy.
JAVA类代码
import
android.content.
Intent;
import
android.content.SharedPreferences;
import
android.graphics.Color;
import
android.os.Bundle;
import
android.view.Menu;
import
android.view.MenuItem;
import
android.view.View;
import
android.widget.Button;
import
android.widget.LinearLayout;
import
android.widget.Toast;
import
androidx.appcompat.app.AppCompat
Activity;
import
androidx.preference.PreferenceManager;
public class Sy extends AppCompat
Activity {
private Button btnAdd;
private Button btnSearch;
private Button btnSetting;
private static final int item1 = Menu.FIRST;
private static final int item2 = Menu.FIRST + 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sy);
btnAdd = findViewById(R.id.btn_add);
btnSearch = findViewById(R.id.btn_search);
btnSetting = findViewById(R.id.btn_setting);
btnSetting.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new
Intent(Sy.this, Settings
Activity.class);
start
Activity(
intent);
}
});
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new
Intent(Sy.this, Xz.class);
start
Activity(
intent);
}
});
btnSearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new
Intent(Sy.this, Ss.class);
start
Activity(
intent);
}
});
}
public void onResume(){
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
String size = sp.getString("font_size","25");
Button sy = findViewById(R.id.btn_add);
sy.setTextSize(Integer.valueOf(size));
Button cx = findViewById(R.id.btn_search);
cx.setTextSize(Integer.valueOf(size));
Button sz = findViewById(R.id.btn_setting);
sz.setTextSize(Integer.valueOf(size));
String bg = sp.getString("bg","c");
int pic_id = this.getResources().getIdentifier(bg,"drawable","com.example.myapplication");
LinearLayout bg_b = findViewById(R.id.bg_d);
bg_b.setBackgroundResource(pic_id);
updateUI();
super.onResume();
}
private void updateUI() {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
String fontSize = sp.getString("font_size", "15");
int size = Integer.parseInt(fontSize);
String textColor = sp.getString("text_color", "#FF000000");
int color = Color.parseColor(textColor);
applyStyleToButton(btnAdd, size, color);
applyStyleToButton(btnSearch, size, color);
applyStyleToButton(btnSetting, size, color);
}
private void applyStyleToButton(Button btn, int size, int color) {
btn.setTextSize(size);
btn.setTextColor(color);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, item1, 0, "关于");
menu.add(0, item2, 0, "退出");
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case item1
:
Toast.makeText(Sy.this, "姓名：骆树涛。学号：2404224132",
Toast.LENGTH_SHORT).show();
break;
case item2
:
finishAffinity();
break;
}
return true;
}
}
首页的sy.XML布局文件代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/bg_d"
xmlns
:android="http
://schemas.
android.com/apk/res/
android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btn_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="新增"
android:textSize="15dp"/>
<Button
android:id="@+id/btn_search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询"
android:textSize="15dp"/>
<Button
android:id="@+id/btn_setting"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="设置"
android:textSize="15dp"/>
</LinearLayout>
Settings
Activity.
Java设置类代码：
import
android.os.Bundle;
import
androidx.appcompat.app.AppCompat
Activity;
import
androidx.preference.PreferenceFragmentCompat;
public class Settings
Activity extends AppCompat
Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.se); // 加载容器布局
// 加载PreferenceFragment到
Activity中
getSupportFragmentManager()
.beginTransaction()
.replace(
android.R.id.content, new SettingsFragment())
.commit();
}
// 静态内部类：管理设置项的Fragment
public static class SettingsFragment extends PreferenceFragmentCompat {
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
// 从XML文件加载设置项（需创建res/xml/settings.xml）
setPreferencesFromResource(R.xml.settings, rootKey);
}
}
}
Se.XML布局文件代码：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns
:android="http
://schemas.
android.com/apk/res/
android"
android:id="@
android:id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
arry.XML的valuse代码：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- 颜色选项 -->
<string-array name="color_entries">
<item>黑色</item>
<item>红色</item>
<item>黄色</item>
<item>蓝色</item>
</string-array>
<string-array name="color_values">
<item>#FF000000</item> <!-- 黑色 -->
<item>#FFFF0000</item> <!-- 红色 -->
<item>#FFFFFF00</item> <!-- 黄色 -->
<item>#FF0000FF</item> <!-- 蓝色 -->
</string-array>
<!-- 背景图片选项（需在drawable目录准备对应图片） -->
<string-array name="bg">
<item>科技</item>
<item>书籍</item>
</string-array>
<string-array name="bg_hhg">
<item>a</item>
<item>b</item>
<item>c</item>
</string-array>
</resources>
sring.XML的xml代码：
<?xml version="1.0" encoding="utf-8"?>
<
PreferenceScreen xmlns
:android="http
://schemas.
android.com/apk/res/
android">
<!-- 字号设置 -->
<EditTextPreference
android:key="font_size"
android:title="字号设置"
android:summary="输入文字大小"
android:defaultValue="15"
android:inputType="number"/>
<!-- 颜色选择 -->
<ListPreference
android:key="text_color"
android:title="文字颜色"
android:summary="选择文字显示颜色"
android:defaultValue="black"
android:entries="@array/color_entries"
android:entryValues="@array/color_values"/>
<!-- 背景图片选择 -->
<ListPreference
android:key="bg"
android:title="首页背景"
android:summary="选择首页背景图片"
android:entries="@array/bg"
android:entryValues="@array/bg_hhg"/>
</
PreferenceScreen>
AndroidManifest.xml代码
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns
:android="http
://schemas.
android.com/apk/res/
android"
xmlns
:tools="http
://schemas.
android.com/tools">
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.MyApplication"
tools
:targetApi="31">
<meta-data
android:name="com.google.
android.actions"
android:resource="@layout/sy" />
<
activity
android:name=".Sy"
android:exported="true">
<
intent-filter>
<action
android:name="
android.
intent.action.MAIN" />
<category
android:name="
android.
intent.category.LAUNCHER" />
</
intent-filter>
</
activity>
<
activity android:name=".Xz" />
<
activity android:name=".Xq" />
<
activity android:name=".Ss" />
<
activity android:name=".Cada" />
<!-- 新增：注册设置活动 -->
<
activity
android:name=".Settings
Activity"
android:label="设置"
android:theme="@style/Theme.AppCompat.Light.DarkActionBar" />
<!-- <
activity-->
<!--
android:name=".Settings
Activity"-->
<!--
android:exported="true"-->
<!--
android:label="@string/app_name"-->
<!--
android:theme="@style/Theme.MyApplication"/>-->
<!-- <
intent-filter>-->
<!-- <action
android:name="
android.
intent.action.MAIN" />-->
<!-- <category
android:name="
android.
intent.category.LAUNCHER" />-->
<!-- </
intent-filter>-->
<!-- </
activity>-->
</application>
</manifest>
内部存储(Internal Storage)的Context中提供了相应的函数对文件进行操作，
实验7：基于文件存储的数据读写
在实验6的基础上，实现基于
Android系统文件存储的数据存储功能，具体要求如下：
(1)增加一个励志标题添加功能。在首页增加“设置标题”按钮，点击后进入励志标题编辑界面，励志标题文字保存在内部存储的文件中，文件名以
开发者自己的姓名拼音命名，例如“zhangsan.txt”。用户打开软件后，标题栏的标题文字从内部文件中读取并显示。
(2)修改图书新增功能。点击“新增”按钮后，用户输入的图书数据存储在外部文件中，文件名以
开发者自己的姓名拼音命名，例如“zhangsan.txt”。数据新增完毕后，自动跳到图书查询页面。
(3) 修改图书查询页面。打开图书查询界面后，界面中的那条图书信息从外部文件中读取，并显示在相应的位置。
以上内容的全部代码
本文详细介绍了在Android中如何使用PreferenceScreen来启动Activity，包括配置文件wireless_setting.xml中的具体写法，以及如何通过调整WirelessSetting.java中的onPreferenceTreeClick方法确保点击Preference时能够正确跳转。
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