我正在尝试在对话框中插入SeekBar以更改亮度。为此,我编写了这段代码。
public class Lum extends DialogFragment{
private SeekBar brightbar;
private int brightness;
private ContentResolver cResolver;
private Window window;
TextView txtPerc;
boolean stato;
Context context;
public android.app.Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the Builder class for convenient dialog construction
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.dialog_brightness, null);
builder.setView(view);
brightbar = (SeekBar) view.findViewById(R.id.brightbar);
txtPerc = (TextView) view.findViewById(R.id.txtPercentage);
//cResolver = getContentResolver();
//window = getWindow();
brightbar.setMax(255);
brightbar.setKeyProgressIncrement(1);
brightbar = (SeekBar) view.findViewById(R.id.brightbar);
txtPerc = (TextView) view.findViewById(R.id.txtPercentage);
cResolver = getContentResolver();
window = getWindow();
brightbar.setMax(255);
brightbar.setKeyProgressIncrement(1);
try {
brightness = Settings.System.getInt(context.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
} catch (SettingNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
float perc = (brightness /(float)255)*100;
txtPerc.setText((int)perc +" %");
brightbar.setProgress(brightness);
brightbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener()
{
public void onStopTrackingTouch(SeekBar seekBar)
{
Settings.System.putInt(context.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightness);
LayoutParams layoutpars = window.getAttributes();
layoutpars.screenBrightness = brightness / (float)255;
window.setAttributes(layoutpars);
}
public void onStartTrackingTouch(SeekBar seekBar)
{
}
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
brightness = progress;
float perc = (brightness /(float)255)*100;
txtPerc.setText((int)perc +" %");
}
});
builder.setTitle("Brightness")
.setPositiveButton("Close", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dismiss();
}
});
// Create the AlertDialog object and return it
return builder.create();
}
}
问题是我的IDE Eclipse在getContentResolver和getWindow中标记了错误,因为我正在处理DialogFragment而不是Activity。
在该类(class)中如何使用此说明?或者,如果您不能做到这一点,还有替代方法吗?提前致谢
最佳答案
http://developer.android.com/reference/android/content/Context.html#getContentResolver()getContentResolver()
需要上下文。
您有context.getContentResolver()
。使用getActivity().getContentResolver()
。
http://developer.android.com/reference/android/app/Activity.html#getWindow()
同样使用getActivity().getWindow()
getActivity()
返回此片段当前与之关联的 Activity 。