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我的應用程序是一個簡單的「亮度轉換器」，這也改變系統亮度（什麼是不容易實現：D）。
我實際上設置了一切和它的工作正常...除了一個小煩人的事情...每次亮度改變屏幕首先「閃爍」到最高亮度（如100％的光），並在半秒鐘左右，它變成正確的亮度。閃存，同時更改系統亮度
示例：系統亮度應爲120：（最大）1.轉到255，adter半秒變化到120
這是我的兩個類的代碼。虛擬類用於「重置」（對於應用亮度變化所必需的）。
編輯：順便說一句。我認爲問題是「lp.screenBrightness = 100/100.0f;」在虛擬活動中。但它不會沒有它的工作：/
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);
}
}