概述
前言:
1.获取当前系统屏幕亮度
2.修改app屏幕亮度,仅对当前app有效。-可用在出示二维码界面,需要单个界面提高亮度时使用
3.修改系统屏幕亮度,所有app有效。Android 6.0 以上需要动态申请权限
实现:
1.权限
<uses-permission android:name="android.permission.WRITE_SETTINGS"
tools:ignore="ProtectedPermissions" />
2.动态申请
/**
* 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;
@RequiresApi(api = Build.VERSION_CODES.M)
private void initPermission() {
// Settings.System.canWrite(MainActivity.this)
// 检测是否拥有写入系统 Settings 的权限
if (!Settings.System.canWrite(MainActivity5.this)) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
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() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity5.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() {
@Override
public 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();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.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())) {
//授权通过
} else {
Toast.makeText(MainActivity5.this, "您已拒绝修系统Setting的屏幕亮度权限",
Toast.LENGTH_SHORT).show();
}
}
}
}
3.获取系统屏幕亮度(如果不需要修改系统屏幕亮度的话不需要申请权限)
/**
* 获取app屏幕亮度
*
* @param activity
* @return
*/
public static int getScreenBrightness(Activity activity) {
int value = 0;
ContentResolver cr = activity.getContentResolver();
try {
value = Settings.System.getInt(cr, Settings.System.SCREEN_BRIGHTNESS);
} catch (Settings.SettingNotFoundException e) {
}
return value;
}
4.设置app屏幕亮度(仅对当前app有效,不需要申请权限)
/**
* 设置app屏幕亮度
*
* @param activity
* @param value
*/
public static void setScreenBrightness(Activity activity, int value) {
WindowManager.LayoutParams params = activity.getWindow().getAttributes();
params.screenBrightness = value / 255f;
activity.getWindow().setAttributes(params);
}
5.修改系统屏幕亮度(Android 6.0 以上必须动态申请权限)
findViewById(R.id.mBtn_set_system).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//关闭光感
setScreenManualMode(MainActivity5.this);
//设置系统屏幕亮度
ModifySettingsScreenBrightness(MainActivity5.this, 100);
}
});
/**
* 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();
}
}
/**
* 修改Setting 中屏幕亮度值 亮度 0-255
* 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);
}
最后
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