Question

我正在寻找如何改变屏幕的亮度,我发现。这是一种非常好的解决方案,它运作良好,但只是在我很积极的时候。在我的申请被关闭后,亮度回到了我开始评估之前的同样价值。

我想能够改变像我从我的威力中宣传亮度时一样的光明。在来自甲状腺的植被中,有3个州。一个非常光明的黑暗,另一个黑暗。难道能够像有人在这种植被上那样改变光明吗?

Edit1: I created this and I added permision to my manifest but when the app is started I do not see any changes to the brightness, I tried with 10 with 100 and now with 200 but no changes any suggestions ?

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
android.provider.Settings.System.putInt(this.getContentResolver(),
        android.provider.Settings.System.SCREEN_BRIGHTNESS, 200);
}

Answer 1

完成这项工作的是:

Settings.System.putInt(this.getContentResolver(),
        Settings.System.SCREEN_BRIGHTNESS, 20);

WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness =0.2f;// 100 / 100.0f;
getWindow().setAttributes(lp);

startActivity(new Intent(this,RefreshScreen.class));

我提出的问题中的守则并不奏效,因为屏幕没有更新。因此,更新屏幕的一张黑板正在开始操练,而不是在制造这种 du活动时,叫finish(),这样亮度的改变就能够生效。

Answer 2

Use Tor-Morten s solution in that link, but also set the system brightness setting like so:

android.provider.Settings.System.putInt(getContext().getContentResolver(),
android.provider.Settings.System.SCREEN_BRIGHTNESS, bright);

Where bright is an integer ranging from 1 to 255.

Answer 3

I have solved this problem today.

由于你首先必须把许可输入贵国的Manifest.xml档案:

<uses-permission android:name="android.permission.WRITE_SETTINGS" />

档案中的确切位置如何?

<manifest>
    <uses-permission android:name="android.permission.WRITE_SETTINGS" />
    <application>
        <activity />
    </application>
</manifest>

这项许可规定,允许你改变影响其他应用的环境。

现在,你可以自动地把光明放开。

Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);  //this will set the automatic mode on
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);  //this will set the manual mode (set the automatic mode off)

自动模式现在是否变成或消失? 你们可以获取信息

int mode = -1;
try {
    mode = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE); //this will return integer (0 or 1)
} catch (Exception e) {}

因此,如果你想要手工改变光明,你就应该首先确定人工模式,然后才能改变光明。

注:SCREEN_BRLINESS_MODE_AUTOMATIC 1

注

您应利用这一方法。

if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
    //Automatic mode
} else {
    //Manual mode
}

而不是

if (mode == 1) {
    //Automatic mode
} else {
    //Manual mode
}

现在,你可以人工改变亮度

Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightness);  //brightness is an integer variable (0-255), but dont use 0

内容提要

try {
    int brightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);  //returns integer value 0-255
} catch (Exception e) {}

Now everything is set properly, but... you can t see the change yet. You need one more thing to see the change! Refresh the screen... so do this:

    try {
        int br = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);  //this will get the information you have just set...

        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.screenBrightness = (float) br / 255; //...and put it here
        getWindow().setAttributes(lp);
    } catch (Exception e) {}

页: 1

<uses-permission android:name="android.permission.WRITE_SETTINGS" />

Answer 4

Passing the context of the activity while setting up the parameters would also get the job done without any need to start another activity. The following worked for me-

WindowManager.LayoutParams lp = this.getWindow().getAttributes();
lp.screenBrightness =0.00001f;// i needed to dim the display
this.getWindow().setAttributes(lp);

i 在onSensorChanged(>) 方法中,每当显示物发生时,该仪器便会消散。

Answer 5

CompLEX EXAMPLE:

    try {
        //sets manual mode and brightnes 255
        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);  //this will set the manual mode (set the automatic mode off)
        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 255);  //this will set the brightness to maximum (255)

        //refreshes the screen
        int br = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.screenBrightness = (float) br / 255;
        getWindow().setAttributes(lp);

    } catch (Exception e) {}

友情链接