Toggle flashlight on Android via power button press sequence

TaskerFlashlightButton.prj.xml

<TaskerData sr="" dvi="1" tv="4.6u3m">
	<Profile sr="prof92" ve="2">
		<cdate>1426618335190</cdate>
		<clp>true</clp>
		<edate>1427251395506</edate>
		<id>92</id>
		<mid0>93</mid0>
		<nme>FlashlightButton</nme>
		<Event sr="con0" ve="2">
			<code>208</code>
			<pri>0</pri>
		</Event>
		<State sr="con1" ve="2">
			<code>40</code>
			<pin>true</pin>
			<Int sr="arg0" val="2"/>
			<Str sr="arg1" ve="3"/>
		</State>
	</Profile>
	<Project sr="proj0" ve="2">
		<cdate>1427144859127</cdate>
		<name>Flashlight Button</name>
		<pids>92</pids>
		<tids>100,101,94,93</tids>
		<Kid sr="Kid">
			<launchID>93</launchID>
			<pkg>com.glutanimate.flashlightbutton</pkg>
			<vnme>1.0</vnme>
			<vnum>2</vnum>
		</Kid>
		<Img sr="icon" ve="2">
			<nme>hl_aaa_ext_bulb</nme>
		</Img>
	</Project>
	<Task sr="task100">
		<cdate>1351255597661</cdate>
		<edate>1427498501108</edate>
		<id>100</id>
		<nme>FlashOn</nme>
		<pri>10</pri>
		<Action sr="act0" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3">pm</Str>
			<Str sr="arg1" ve="3">CONTEXT</Str>
			<Str sr="arg2" ve="3">getPackageManager
{PackageManager} ()</Str>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act1" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3">%hasflash</Str>
			<Str sr="arg1" ve="3">pm</Str>
			<Str sr="arg2" ve="3">hasSystemFeature
{boolean} (String)</Str>
			<Str sr="arg3" ve="3">android.hardware.camera.flash</Str>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act10" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3"/>
			<Str sr="arg1" ve="3">cam</Str>
			<Str sr="arg2" ve="3">setParameters
{} (android.hardware.Camera$Parameters)</Str>
			<Str sr="arg3" ve="3">params</Str>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act11" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3"/>
			<Str sr="arg1" ve="3">cam</Str>
			<Str sr="arg2" ve="3">startPreview
{} ()</Str>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act12" ve="7">
			<code>130</code>
			<Str sr="arg0" ve="3">FlashAutoOff</Str>
			<Int sr="arg1">
				<var>%priority-1</var>
			</Int>
			<Str sr="arg2" ve="3"/>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Int sr="arg5" val="0"/>
		</Action>
		<Action sr="act13" ve="7">
			<code>35</code>
			<Int sr="arg0" val="0"/>
			<Int sr="arg1" val="1"/>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
			<Int sr="arg4" val="0"/>
			<ConditionList sr="if">
				<Condition sr="c0" ve="3">
					<lhs>%FlashCtl</lhs>
					<op>0</op>
					<rhs>0</rhs>
				</Condition>
			</ConditionList>
		</Action>
		<Action sr="act14" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3"/>
			<Str sr="arg1" ve="3">cam</Str>
			<Str sr="arg2" ve="3">stopPreview
{} ()</Str>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act15" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3"/>
			<Str sr="arg1" ve="3">cam</Str>
			<Str sr="arg2" ve="3">release
{} ()</Str>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act16" ve="7">
			<code>137</code>
			<Int sr="arg0" val="0"/>
			<Str sr="arg1" ve="3">FlashAutoOff</Str>
		</Action>
		<Action sr="act2" ve="7">
			<code>37</code>
			<ConditionList sr="if">
				<Condition sr="c0" ve="3">
					<lhs>%hasflash</lhs>
					<op>1</op>
					<rhs>true</rhs>
				</Condition>
			</ConditionList>
		</Action>
		<Action sr="act3" ve="7">
			<code>548</code>
			<Str sr="arg0" ve="3">Flash unavailable</Str>
			<Int sr="arg1" val="0"/>
		</Action>
		<Action sr="act4" ve="7">
			<code>137</code>
			<Int sr="arg0" val="1"/>
			<Str sr="arg1" ve="3"/>
		</Action>
		<Action sr="act5" ve="7">
			<code>38</code>
		</Action>
		<Action sr="act6" ve="7">
			<code>549</code>
			<Str sr="arg0" ve="3">%FlashCtl</Str>
			<Int sr="arg1" val="0"/>
		</Action>
		<Action sr="act7" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3">cam</Str>
			<Str sr="arg1" ve="3">Camera</Str>
			<Str sr="arg2" ve="3">open
{Camera} ()</Str>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act8" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3">params</Str>
			<Str sr="arg1" ve="3">cam</Str>
			<Str sr="arg2" ve="3">getParameters
{android.hardware.Camera$Parameters} ()</Str>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
		<Action sr="act9" ve="7">
			<code>664</code>
			<Str sr="arg0" ve="3"/>
			<Str sr="arg1" ve="3">params</Str>
			<Str sr="arg2" ve="3">setFlashMode
{} (String)</Str>
			<Str sr="arg3" ve="3">torch</Str>
			<Str sr="arg4" ve="3"/>
			<Str sr="arg5" ve="3"/>
			<Str sr="arg6" ve="3"/>
			<Str sr="arg7" ve="3"/>
		</Action>
	</Task>
	<Task sr="task101">
		<cdate>1427145843081</cdate>
		<edate>1427498503240</edate>
		<id>101</id>
		<nme>FlashOff</nme>
		<pri>10</pri>
		<Action sr="act0" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%FlashCtl</Str>
			<Str sr="arg1" ve="3">0</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
	</Task>
	<Task sr="task93">
		<cdate>1426618354356</cdate>
		<edate>1427498494570</edate>
		<id>93</id>
		<nme>FlashlightControl</nme>
		<pri>10</pri>
		<Action sr="act0" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%CurrentTime</Str>
			<Str sr="arg1" ve="3">%TIMEMS</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
		<Action sr="act1" ve="7">
			<code>37</code>
			<ConditionList sr="if">
				<Condition sr="c0" ve="3">
					<lhs>%ScrLastActive</lhs>
					<op>12</op>
					<rhs></rhs>
				</Condition>
			</ConditionList>
		</Action>
		<Action sr="act10" ve="7">
			<code>61</code>
			<Int sr="arg0" val="25"/>
		</Action>
		<Action sr="act11" ve="7">
			<code>130</code>
			<Str sr="arg0" ve="3">FlashOff</Str>
			<Int sr="arg1">
				<var>%priority</var>
			</Int>
			<Str sr="arg2" ve="3"/>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Int sr="arg5" val="0"/>
		</Action>
		<Action sr="act12" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%FlashStatus</Str>
			<Str sr="arg1" ve="3">off</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
		<Action sr="act13" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%FirstInvocation</Str>
			<Str sr="arg1" ve="3">1</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
		<Action sr="act14" ve="7">
			<code>16</code>
		</Action>
		<Action sr="act15" ve="7">
			<code>43</code>
			<label>Make sure not to trigger twice in a row after 3 display toggles</label>
			<ConditionList sr="if">
				<Condition sr="c0" ve="3">
					<lhs>%FirstInvocation</lhs>
					<op>0</op>
					<rhs>1</rhs>
				</Condition>
			</ConditionList>
		</Action>
		<Action sr="act16" ve="7">
			<code>549</code>
			<Str sr="arg0" ve="3">%FirstInvocation</Str>
			<Int sr="arg1" val="0"/>
		</Action>
		<Action sr="act17" ve="7">
			<code>38</code>
		</Action>
		<Action sr="act18" ve="7">
			<code>38</code>
		</Action>
		<Action sr="act19" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%ScrLastActive</Str>
			<Str sr="arg1" ve="3">%TIMEMS</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
		<Action sr="act2" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%dScrActive</Str>
			<Str sr="arg1" ve="3">%CurrentTime-%ScrLastActive</Str>
			<Int sr="arg2" val="1"/>
			<Int sr="arg3" val="0"/>
		</Action>
		<Action sr="act3" ve="7">
			<code>37</code>
			<ConditionList sr="if">
				<bool0>And</bool0>
				<bool1>And</bool1>
				<Condition sr="c0" ve="3">
					<lhs>%dScrActive</lhs>
					<op>6</op>
					<rhs>1500</rhs>
				</Condition>
				<Condition sr="c1" ve="3">
					<lhs>%FlashStatus</lhs>
					<op>1</op>
					<rhs>on</rhs>
				</Condition>
				<Condition sr="c2" ve="3">
					<lhs>%FirstInvocation</lhs>
					<op>1</op>
					<rhs>1</rhs>
				</Condition>
			</ConditionList>
		</Action>
		<Action sr="act4" ve="7">
			<code>61</code>
			<Int sr="arg0" val="25"/>
		</Action>
		<Action sr="act5" ve="7">
			<code>130</code>
			<Str sr="arg0" ve="3">FlashOn</Str>
			<Int sr="arg1">
				<var>%priority-1</var>
			</Int>
			<Str sr="arg2" ve="3"/>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Int sr="arg5" val="0"/>
		</Action>
		<Action sr="act6" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%FlashStatus</Str>
			<Str sr="arg1" ve="3">on</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
		<Action sr="act7" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%FirstInvocation</Str>
			<Str sr="arg1" ve="3">1</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
		<Action sr="act8" ve="7">
			<code>16</code>
			<label>Turn off screen after flashlight toggle</label>
		</Action>
		<Action sr="act9" ve="7">
			<code>43</code>
			<ConditionList sr="if">
				<bool0>And</bool0>
				<Condition sr="c0" ve="3">
					<lhs>%dScrActive</lhs>
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				</Condition>
				<Condition sr="c1" ve="3">
					<lhs>%FirstInvocation</lhs>
					<op>1</op>
					<rhs>1</rhs>
				</Condition>
			</ConditionList>
		</Action>
	</Task>
	<Task sr="task94">
		<cdate>1426620544981</cdate>
		<edate>1427498506490</edate>
		<id>94</id>
		<nme>FlashAutoOff</nme>
		<pri>10</pri>
		<Action sr="act0" ve="7">
			<code>30</code>
			<Int sr="arg0" val="0"/>
			<Int sr="arg1" val="0"/>
			<Int sr="arg2" val="1"/>
			<Int sr="arg3" val="0"/>
			<Int sr="arg4" val="0"/>
		</Action>
		<Action sr="act1" ve="7">
			<code>130</code>
			<Str sr="arg0" ve="3">FlashOff</Str>
			<Int sr="arg1">
				<var>%priority</var>
			</Int>
			<Str sr="arg2" ve="3"/>
			<Str sr="arg3" ve="3"/>
			<Str sr="arg4" ve="3"/>
			<Int sr="arg5" val="0"/>
		</Action>
		<Action sr="act2" ve="7">
			<code>547</code>
			<Str sr="arg0" ve="3">%FlashStatus</Str>
			<Str sr="arg1" ve="3">off</Str>
			<Int sr="arg2" val="0"/>
			<Int sr="arg3" val="0"/>
		</Action>
	</Task>
</TaskerData>

Revision 0.1

Initial commit. A more detailed description of this profile and installation instructions may be found here.

Revision 0.2

The latest revision adds the following:

• a quick vibration to notify the user of the flashlight toggle
• screen now automatically turns off after the third power button press (requires device admin privileges for Tasker)

Other changes:

• interval reduced to 2.5s

Revision 0.3

• Replaced third-party Tesla plugin with Java call to enable flashlight (based on this method)
• Added a short refractory period after the button-press sequence that prevents accidentally triggering the flashlight toggle more than once
• reduced interval to 1.5s (profile seems to execute faster now)

Any interest in submitting this here: https://github.com/ProLoser/Tasker-Presets/ ?

Just wanted to say that this is working great on my GS4 (SCH-i545PP). I imported as a project and it works. The only issue I thought I had turned out to be caused by my tapping the power key too quickly.