我正在尝试在对话框中插入SeekBar来改变亮度.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标记了getContentResolver和getWindow中的错误,因为我正在使用DialogFragment而不是Activity.
如何在本课程中使用此说明?或者,如果你不能这样做,还有另一种选择吗?提前致谢
解决方法
http://developer.android.com/reference/android/content/Context.html#getContentResolver()
getContentResolver()需要一个上下文.
你有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.