极力推荐Android 开发大总结文章:欢迎收藏Android 开发技术文章大总结
本篇文章主要介绍 Android
开发中的部分知识点,通过阅读本篇文章,您将收获以下内容:
一、获取系统Settings 中的亮度
系统屏幕亮度值在(0~255)
之间,获取方法很简单,只需要调用以下方法即可。
/*** 1.获取系统默认屏幕亮度值 屏幕亮度值范围(0-255)* **/private int getScreenBrightness(Context context) {ContentResolver contentResolver = context.getContentResolver();int defVal = 125;return Settings.System.getInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS, defVal);}
修改屏幕亮度包含两种:APP
。Settings
中屏幕亮度,影响所有APP
.
二,修改APP界面屏幕亮度,不会影响其他APP
修改自身 APP
亮度很简单,只需要在Activity OnCreate
方法调用如下代码即可。
/*** 2.设置 APP界面屏幕亮度值方法* **/private void setAppScreenBrightness(int birghtessValue) {Window window = getWindow();WindowManager.LayoutParams lp = window.getAttributes();lp.screenBrightness = birghtessValue / 255.0f;window.setAttributes(lp);}
三、修改系统Settings 中屏幕亮度,影响所有APP
修改系统 Settings
中的屏幕亮度,由于会影响到所有APP
,需要申请修改Settings
的权限<uses-permission * android:name="android.permission.WRITE_SETTINGS"/>
,同时需要取消光感自动调节屏幕亮度的功能,设置为手动调节模式,否则光感传感器会随着光照强度的变化修改系统屏幕亮度,并且非系统签名的APP
,需要用户手动授权后才可以修改背光亮度。
关闭光感,设置手动调节背光模式实现方法如下:
/*** 3.关闭光感,设置手动调节背光模式** SCREEN_BRIGHTNESS_MODE_AUTOMATIC 自动调节屏幕亮度模式值为1** SCREEN_BRIGHTNESS_MODE_MANUAL 手动调节屏幕亮度模式值为0* **/public void setScreenManualMode(Context context) {ContentResolver contentResolver = context.getContentResolver();try {int mode = Settings.System.getInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS_MODE);if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {Settings.System.putInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);}} catch (Settings.SettingNotFoundException e) {e.printStackTrace();}}
非系统签名应用,引导用户手动授权修改Settings 权限
非系统签名应用,无法直接修改Settings
,需要引导用户手动授权。
引导用户手动授权
/*** 4.非系统签名应用,引导用户手动授权修改Settings 权限* **/private static final int REQUEST_CODE_WRITE_SETTINGS = 1000;private void allowModifySettings() {// Settings.System.canWrite(MainActivity.this)// 检测是否拥有写入系统 Settings 的权限if (!Settings.System.canWrite(MainActivity.this)) {AlertDialog.Builder builder = new AlertDialog.Builder(this,android.R.style.Theme_Material_Light_Dialog_Alert);builder.setTitle("请开启修改屏幕亮度权限");builder.setMessage("请点击允许开启");// 拒绝, 无法修改builder.setNegativeButton("拒绝",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this,"您已拒绝修系统Setting的屏幕亮度权限", Toast.LENGTH_SHORT).show();}});builder.setPositiveButton("去开启",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 打开允许修改Setting 权限的界面Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS, Uri.parse("package:"+ getPackageName()));startActivityForResult(intent,REQUEST_CODE_WRITE_SETTINGS);}});builder.setCancelable(false);builder.show();}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if (requestCode == REQUEST_CODE_WRITE_SETTINGS) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {// Settings.System.canWrite方法检测授权结果if (Settings.System.canWrite(getApplicationContext())) {// 5.调用修改Settings屏幕亮度的方法 屏幕亮度值 200ModifySettingsScreenBrightness(MainActivity.this, 200);Toast.makeText(this, "系统屏幕亮度值" + getScreenBrightness(this),Toast.LENGTH_SHORT).show();} else {Toast.makeText(MainActivity.this, "您已拒绝修系统Setting的屏幕亮度权限",Toast.LENGTH_SHORT).show();}}}}
修改Setting 中屏幕亮度值 实现
拥有系统签名的应用可以直接调用此方法修改系统屏幕亮度,非系统签名应用,只有用户授权后才可以修改。
/*** 5.修改Setting 中屏幕亮度值** 修改Setting的值需要动态申请权限 <uses-permission* android:name="android.permission.WRITE_SETTINGS"/>* **/private void ModifySettingsScreenBrightness(Context context,int birghtessValue) {// 首先需要设置为手动调节屏幕亮度模式setScreenManualMode(context);ContentResolver contentResolver = context.getContentResolver();Settings.System.putInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS, birghtessValue);}
四、完整代码实现
完整代码实现如下:
package com.example.test;import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//获取屏幕亮度getScreenBrightness(this);Toast.makeText(this, "系统屏幕亮度值" + getScreenBrightness(this),Toast.LENGTH_SHORT).show();// 设置APP 屏幕亮度后,系统Setting亮度将对此app 不生效setAppScreenBrightness(100);allowModifySettings();setContentView(R.layout.activity_main);}/*** 1.获取系统默认屏幕亮度值 屏幕亮度值范围(0-255)* **/private int getScreenBrightness(Context context) {ContentResolver contentResolver = context.getContentResolver();int defVal = 125;return Settings.System.getInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS, defVal);}/*** 2.设置 APP界面屏幕亮度值方法* **/private void setAppScreenBrightness(int birghtessValue) {Window window = getWindow();WindowManager.LayoutParams lp = window.getAttributes();lp.screenBrightness = birghtessValue / 255.0f;window.setAttributes(lp);}/*** 3.关闭光感,设置手动调节背光模式** SCREEN_BRIGHTNESS_MODE_AUTOMATIC 自动调节屏幕亮度模式值为1** SCREEN_BRIGHTNESS_MODE_MANUAL 手动调节屏幕亮度模式值为0* **/public void setScreenManualMode(Context context) {ContentResolver contentResolver = context.getContentResolver();try {int mode = Settings.System.getInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS_MODE);if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {Settings.System.putInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);}} catch (Settings.SettingNotFoundException e) {e.printStackTrace();}}/*** 4.非系统签名应用,引导用户手动授权修改Settings 权限* **/private static final int REQUEST_CODE_WRITE_SETTINGS = 1000;private void allowModifySettings() {// Settings.System.canWrite(MainActivity.this)// 检测是否拥有写入系统 Settings 的权限if (!Settings.System.canWrite(MainActivity.this)) {AlertDialog.Builder builder = new AlertDialog.Builder(this,android.R.style.Theme_Material_Light_Dialog_Alert);builder.setTitle("请开启修改屏幕亮度权限");builder.setMessage("请点击允许开启");// 拒绝, 无法修改builder.setNegativeButton("拒绝",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this,"您已拒绝修系统Setting的屏幕亮度权限", Toast.LENGTH_SHORT).show();}});builder.setPositiveButton("去开启",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 打开允许修改Setting 权限的界面Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS, Uri.parse("package:"+ getPackageName()));startActivityForResult(intent,REQUEST_CODE_WRITE_SETTINGS);}});builder.setCancelable(false);builder.show();}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if (requestCode == REQUEST_CODE_WRITE_SETTINGS) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {// Settings.System.canWrite方法检测授权结果if (Settings.System.canWrite(getApplicationContext())) {// 5.调用修改Settings屏幕亮度的方法 屏幕亮度值 200ModifySettingsScreenBrightness(MainActivity.this, 200);Toast.makeText(this, "系统屏幕亮度值" + getScreenBrightness(this),Toast.LENGTH_SHORT).show();} else {Toast.makeText(MainActivity.this, "您已拒绝修系统Setting的屏幕亮度权限",Toast.LENGTH_SHORT).show();}}}}/*** 5.修改Setting 中屏幕亮度值** 修改Setting的值需要动态申请权限 <uses-permission* android:name="android.permission.WRITE_SETTINGS"/>* **/private void ModifySettingsScreenBrightness(Context context,int birghtessValue) {// 首先需要设置为手动调节屏幕亮度模式setScreenManualMode(context);ContentResolver contentResolver = context.getContentResolver();Settings.System.putInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS, birghtessValue);}
}
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