am, cmd, dalvikvm, settings: add page (#5481)

pages/android/am.md

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+# am
+
+> Android activity manager.
+> More information: <https://developer.android.com/studio/command-line/adb#am>.
+
+- Start a specific activity:
+
+`am start -n {{com.android.settings/.Settings}}`
+
+- Start an activity and pass data to it:
+
+`am start -a {{android.intent.action.VIEW}} -d {{tel:123}}`
+
+- Start an activity matching a specific action and category:
+
+`am start -a {{android.intent.action.MAIN}} -c {{android.intent.category.HOME}}`
+
+- Convert an intent to an URI:
+
+`am to-uri -a {{android.intent.action.VIEW}} -d {{tel:123}}`

pages/android/cmd.md

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+# cmd
+
+> Android service manager.
+
+- List every running service:
+
+`cmd -l`
+
+- Call a specific service:
+
+`cmd {{alarm}}`
+
+- Call a service with arguments:
+
+`cmd {{vibrator}} {{vibrate 300}}`

pages/android/dalvikvm.md

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+# dalvikvm
+
+> Android Java virtual machine.
+> More information: <https://source.android.com/devices/tech/dalvik>.
+
+- Start a Java program:
+
+`dalvikvm -classpath {{path/to/file.jar}} {{classname}}`

pages/android/settings.md

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+# settings
+
+> Get information about the Android OS.
+
+- Display a list of settings in the `global` namespace:
+
+`settings list {{global}}`
+
+- Get the value of a specific setting:
+
+`settings get {{global}} {{airplane_mode_on}}`
+
+- Set the value of a setting:
+
+`settings put {{system}} {{screen_brightness}} {{42}}`
+
+- Delete a specific setting:
+
+`settings delete {{secure}} {{screensaver_enabled}}`