企业网站源码自适应seo实战密码第三版

1、开发需求

需求：开发一个Android apk实现手机亮度控制

2、运行环境

Android studio最新版本

3、主要文件

app\src\main\AndroidManifest.xml
app\src\main\res\layout\activity_main.xml
app\src\main\java\com\example\sylon\MainActivity.java
代码路径：app\src\main\AndroidManifest.xml
需要修改权限

4、布局文件信息

路径：app\src\main\res\layout\activity_main.xml

<?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:id="@+id/main"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><SeekBarandroid:id="@+id/seekBar"android:layout_width="274dp"android:layout_height="32dp"android:layout_marginStart="27dp"android:layout_marginTop="38dp"android:layout_marginEnd="83dp"android:layout_marginBottom="24dp"android:maxHeight="5.0dp"android:minHeight="5.0dp"android:progressDrawable="@drawable/sb_bar"android:thumb="@drawable/sb_thumb"app:layout_constraintBottom_toTopOf="@+id/textview"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="0.037"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="1.0" /><TextViewandroid:id="@+id/textview"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="40dp"android:layout_marginTop="120dp"android:layout_marginEnd="30dp"android:layout_marginBottom="16dp"android:text="sylonbar"app:layout_constraintBottom_toBottomOf="parent"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="0.187" /></androidx.constraintlayout.widget.ConstraintLayout>

5、手机界面控制代码

路径：app\src\main\java\com\example\sylon\MainActivity.java

package com.example.sylon;
import android.os.Bundle;
import android.app.Activity;
import android.view.WindowManager;
import android.view.Window;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import android.content.Context;
import android.content.ContentResolver;
import android.provider.Settings;
import android.util.Log;/*
public class MouseSpeedChanger {private static final String TAG = "MouseSpeedChanger";// 修改鼠标速度的方法public static void setMouseSpeed(ContentResolver resolver, int speed) {if (speed >= 1 && speed <= 10) {// 将鼠标速度的值存储到系统设置中Settings.System.putInt(resolver, Settings.System.POINTER_SPEED, speed);// 通知系统设置已更改Uri uri = Settings.System.getUriFor(Settings.System.POINTER_SPEED);resolver.notifyChange(uri, null);Log.d(TAG, "Mouse speed set to: " + speed);} else {Log.e(TAG, "Invalid mouse speed value: " + speed);}}
}
*/
public class MainActivity extends AppCompatActivity {private SeekBar seekb_normal;private TextView txt_cur;private Context mContext;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//mContext = MainActivity.this;bindViews();}// 获取当前屏幕亮度值private int getCurrentBrightness() {int brightness = 0;try {brightness = Settings.System.getInt(getContentResolver(), Settings.System.POINTER_SPEED);} catch (Settings.SettingNotFoundException e) {e.printStackTrace(); // 捕获异常}return brightness;}// 设置新的屏幕亮度private void setBrightness(int brightness) {ContentResolver cResolver = getContentResolver();// 将进度值转换为0-255范围int newBrightness = brightness * 255 / 100;if (Settings.System.canWrite(this)) {Settings.System.putInt(cResolver, Settings.System.POINTER_SPEED, newBrightness);}// 更新当前窗口的亮度WindowManager.LayoutParams layoutParams = getWindow().getAttributes();layoutParams.screenBrightness = newBrightness / 255.0f; // 转换为0.0到1.0之间getWindow().setAttributes(layoutParams);}private void bindViews() {seekb_normal = (SeekBar) findViewById(R.id.seekBar);txt_cur = (TextView) findViewById(R.id.textview);int currentBrightness = getCurrentBrightness();seekb_normal.setProgress(currentBrightness*100/255);txt_cur.setText("当前亮度: " + currentBrightness*100/255);mContext = getApplicationContext();seekb_normal.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {setBrightness(progress);txt_cur.setText("当前亮度:" + progress + "  / 100 ");}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {Toast.makeText(mContext, "触碰SeekBar", Toast.LENGTH_SHORT).show();}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {Toast.makeText(mContext, "放开SeekBar", Toast.LENGTH_SHORT).show();}});}
}

6、debug

工具如果找不到，直接全局搜索。