更改系统亮度时闪烁

Question

我的应用程序是一个简单的“Brightness Changer”，它还可以更改系统亮度（实现起来并不容易：D）。
我实际上设置了所有东西并且它工作正常......除了一个小烦人的事情......每次亮度改变屏幕首先“闪烁”到最高亮度（如100％光）并且在半秒左右后，它更改为正确的亮度。

示例：系统亮度应为 120：1. 更改为 255（最大值），半秒更改为 120。

这是我的两个类的代码。 Dummy 类用于“重置”（应用亮度更改所必需的。）

编辑：顺便说一句。我认为问题是“lp.screenBrightness = 100/100.0f;”在虚拟活动中。但没有它就行不通：/

---

test.java

public class Test extends Activity
{
    SeekBar seekbar;
    TextView value;
    TextView debug;
    Button button1;
    Button button2;
    Button button3;

    public void onCreate(Bundle savedInstanceState)
    {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        value = (TextView) findViewById(R.id.textview2);
        debug = (TextView) findViewById(R.id.textview3);
        seekbar = (SeekBar) findViewById(R.id.seekbar);
        button1 = (Button) findViewById(R.id.button1);
        button2 = (Button) findViewById(R.id.button2);
        button3 = (Button) findViewById(R.id.button3);

        seekbar.setOnSeekBarChangeListener( new OnSeekBarChangeListener()
        {
            public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser)
            {
                // TODO Auto-generated method stub
                int brightness = progress+1;
                double b = brightness/2.55;
                double c = Math.round(b*100)/100;
                int percent = (int) c;
                if (percent==0) {
                    value.setText("Lightlevel: !MIN!");
                }else if (percent==100){
                    value.setText("Lightlevel: !MAX!");
                }else{
                    value.setText("Lightlevel: "+percent+"%");
                }
                debug.setText("int brightness: "+brightness+" / double b:"+b+" / double c: "+c+" / int percent: "+percent);
                Settings.System.putInt(getContentResolver(),Settings.System.SCREEN_BRIGHTNESS, brightness);
            }

            public void onStartTrackingTouch(SeekBar seekBar)
            {
                // TODO Auto-generated method stub
                Intent in = new Intent(Test.this,DummyBrightnessActivity.class);
                startActivity(in);
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub

            }
        });


        button1.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Settings.System.putInt(getContentResolver(),Settings.System.SCREEN_BRIGHTNESS, 1);

                Intent in = new Intent(Test.this,DummyBrightnessActivity.class);
                startActivity(in);
            }

        });

        button2.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Settings.System.putInt(getContentResolver(),Settings.System.SCREEN_BRIGHTNESS, 127);

                Intent in = new Intent(Test.this,DummyBrightnessActivity.class);
                startActivity(in);
            }

        });

        button3.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Settings.System.putInt(getContentResolver(),Settings.System.SCREEN_BRIGHTNESS, 255);

                Intent in = new Intent(Test.this,DummyBrightnessActivity.class);
                startActivity(in);
            }

        });
    }
}

DummyBrightnessActivity.java

public class DummyBrightnessActivity extends Activity{

    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.dummy);

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

        Timer timer2 = new Timer();
        timer2.schedule(new TimerTask() {

           public void run() {

              finish();

           }

        }, 500);

    }
}

Answer 1

回答我自己的问题以备将来使用。

问题确实是lp.screenBrightness = 100/100.0f;。所以我在intent 中放了一些变量，它的正确值是brightness，所以我可以让它像lp.screenBrightness = brightness;。

我知道这有点短，但如果有人想了解更多，请在评论中提问。