App开发的教程-滑动屏幕调整屏幕亮度.zip

package com.TestBrightness; import android.app.Activity; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import com.TestBrightness.manager.SystemManager; public class TestBrightness extends Activity implements OnClickListener{ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); SystemManager.init(this); showBrightnessSettingDialog(); } @Override public void onClick(View v) { showBrightnessSettingDialog(); } private int mOldBrightness; private int mCurrentBrightness = 0; private int mOldAutomatic; private boolean mAutomaticAvailable; /** * Brightness value for dim backlight */ private static final int BRIGHTNESS_DIM = 20; /** * Brightness value for fully on */ private static final int BRIGHTNESS_ON = 255; // Backlight range is from 0 - 255. Need to make sure that user // doesn't set the backlight to 0 and get stuck private static final int MINIMUM_BACKLIGHT = BRIGHTNESS_DIM + 10; private static final int MAXIMUM_BACKLIGHT = BRIGHTNESS_ON; private void showBrightnessSettingDialog(){ final SystemManager systemManager = SystemManager.getInstance(); final Builder builder = new AlertDialog.Builder(this); final View view = getLayoutInflater().inflate(R.layout.brightness_view, null); // set brightness seekbar final SeekBar brightnessBar = (SeekBar) view.findViewById(R.id.brightness_bar); brightnessBar.setMax(MAXIMUM_BACKLIGHT - MINIMUM_BACKLIGHT); int brightness = systemManager.getScreenBrightness(); int process = brightness - MINIMUM_BACKLIGHT; if (process<0) { process = 0; mOldBrightness = MINIMUM_BACKLIGHT; mCurrentBrightness = MINIMUM_BACKLIGHT; }else{ mOldBrightness = brightness; mCurrentBrightness = brightness; } brightnessBar.setProgress(process); // set automatic available checkbox final CheckBox autoBrightness = (CheckBox)view.findViewById(R.id.auto_brightness); mOldAutomatic = systemManager.getBrightnessMode(); mAutomaticAvailable = systemManager.isAutoBrightness(); autoBrightness.setChecked(mAutomaticAvailable); if(mAutomaticAvailable){ brightnessBar.setVisibility(View.GONE); }else{ brightnessBar.setVisibility(View.VISIBLE); } autoBrightness.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(final CompoundButton buttonView, final boolean isChecked) { mAutomaticAvailable = isChecked; if(isChecked){ brightnessBar.setVisibility(View.GONE); systemManager.startAutoBrightness(); //systemManager.setBrightness(MainActivity.this, systemManager.getScreenBrightness()); int process = systemManager.getScreenBrightness() - MINIMUM_BACKLIGHT; if (process<0) { process = 0; }// end if brightnessBar.setProgress(process); }else{ brightnessBar.setVisibility(View.VISIBLE); systemManager.stopAutoBrightness(); //systemManager.setBrightness(MainActivity.this, systemManager.getScreenBrightness()); int process = systemManager.getScreenBrightness() - MINIMUM_BACKLIGHT; if (process<0) { process = 0; }// end if brightnessBar.setProgress(process); } } }); brightnessBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(final SeekBar seekBar) { } @Override public void onStartTrackingTouch(final SeekBar seekBar) { } @Override public void onProgressChanged(final SeekBar seekBar, final int progress, final boolean fromUser) { mCurrentBrightness = progress + MINIMUM_BACKLIGHT; systemManager.setBrightness(TestBrightness.this, mCurrentBrightness); } }); builder.setTitle(R.string.brightness); builder.setView(view); builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){ @Override public void onClick(final DialogInterface dialog, final int which) { // set brightness if(mAutomaticAvailable){ systemManager.saveBrightness(systemManager.getScreenBrightness()); }else{ systemManager.saveBrightness(mCurrentBrightness); } } }); builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { @Override public void onClick(final DialogInterface dialog, final int which) { // recover brightness systemManager.setBrightness(TestBrightness.this, mOldBrightness); systemManager.saveBrightness(mOldBrightness); // recover automatic brightness mode systemManager.setBrightnessMode(mOldAutomatic); } }); builder.show(); } }