Write your own Android flashlight, support 5.0

The Android flashlight principle is simple, is to turn on the camera flash.

The core code is so much:

Turn on the camera

Set the Flash to open

Open Preview

Setting the camera's autofocus

Camera camera = Camera.open ();    Parameters mparameters = Camera.getparameters ();     Mparameters.setflashmode (Camera.Parameters.FLASH_MODE_TORCH);    Camera.setparameters (mparameters);    Camera.startpreview (); Camera.autofocus (New Autofocuscallback () {public void Onautofocus (Boolean success, Camera camera) {}});

These few steps are indispensable. I tried it on the internet before, and it never worked. Just because there's something missing. Open preview, some missing autofocus

Then it's set permissions.

<uses-permission android:name= "Android.permission.CAMERA"/>    <uses-permission android:name= "  Android.permission.FLASHLIGHT "/> <uses-feature android:name=" Android.hardware.camera "/> <uses-feature Android:name= "Android.hardware.camera.autofocus"/>    <uses-feature android:name= " Android.hardware.camera.flash "/>

Finally, the following complete activity is posted. My this is very simple, create the time to turn on the flashlight, the screen shows "Flashlight Open", press the Return key, close and exit the app.

Package Org.lhc.flashlight;import Android.app.activity;import Android.hardware.camera;import Android.hardware.camera.autofocuscallback;import Android.hardware.camera.parameters;import Android.os.Bundle; Import Android.util.log;import Android.view.keyevent;import Android.widget.textview;public class MainActivity Extends Activity {private camera camera = null; @Overrideprotected void OnCreate (Bundle savedinstancestate) { Super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); This.camera = Camera.open (); if ( This.camera = null) {Parameters mparameters = Camera.getparameters (); Mparameters.setflashmode ( Camera.Parameters.FLASH_MODE_TORCH); Camera.setparameters (mparameters); Camera.startpreview (); Camera.autofocus (new Autofocuscallback () {public void Onautofocus (Boolean success, Camera camera) {}}); TextView info = (TextView) This.findviewbyid (r.id.flashlight_info); Info.settext ("Flashlight Open");}} @Overridepublic boolean onKeyDown (int keycode, keyevent event) {if (keycode = = KeyeVent. Keycode_back) {if (This.camera! = null) {Parameters mparameters = Camera.getparameters (); Mparameters.setflashmode ( Camera.Parameters.FLASH_MODE_OFF); camera.setparameters (mparameters); Camera.stoppreview (); Camera.release ();} LOG.I ("Flashlight", "exit"); This.finish (); System.exit (0);} Return Super.onkeydown (KeyCode, event);}}

Reprint please indicate the source

Http://blog.csdn.net/redstarofsleep

Write your own Android flashlight, support 5.0