Camera Flash blinken lassen...?

1public void flash() { // FlashLight on
2 Runnable runnable = new Runnable() {
3
4
5 @Override
6 public void run() {
7 while (true) {
8 camera = null;
9 camera = Camera.open();
10 p = camera.getParameters();
11 p.setFlashMode(Parameters.FLASH_MODE_TORCH);
12 camera.setParameters(p);
13 camera.startPreview(); // Hier wird das Flashlight aktiviert
14 try {
15 Thread.sleep(20);
16 camera.stopPreview();
17 camera.release(); // Hier wieder deaktiviert
18 } catch (InterruptedException e) {
19 e.printStackTrace();
20 }
21
22 }
23 }
24 };
25 Thread thread = new Thread(runnable);
26 thread.start();
27
28 }

1package com.example.flashdance;
2
3import android.app.Activity;
4import android.content.Context;
5import android.content.pm.PackageManager;
6import android.hardware.Camera;
7import android.os.Bundle;
8import android.view.Menu;
9
10public class FlashDance extends Activity {
11 PackageManager packageManager;
12 static boolean haveFlashLight;
13 static final int millies = 1500;
14 Camera camera;
15
16 @Override
17 protected void onCreate(Bundle savedInstanceState) {
18 super.onCreate(savedInstanceState);
19 setContentView(R.layout.activity_flash_dance);
20 camera = null;
21 camera = Camera.open();
22 Camera.Parameters params = camera.getParameters();
23 params.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
24 camera.setParameters(params);
25 camera.startPreview();
26 }
27
28 @Override
29 public boolean onCreateOptionsMenu(Menu menu) {
30 getMenuInflater().inflate(R.menu.flash_dance, menu);
31 return true;
32 }
33
34 public boolean checkFlashLightAvailable(Context context) {
35 if (context.getPackageManager().hasSystemFeature(
36 PackageManager.FEATURE_CAMERA_FLASH)) {
37 return true;
38 } else {
39 return false;
40 }
41 }
42
43}

110-03 17:03:10.345: E/AndroidRuntime(31641): FATAL EXCEPTION: Thread-3030
210-03 17:03:10.345: E/AndroidRuntime(31641): java.lang.RuntimeException: Fail to connect to camera service
310-03 17:03:10.345: E/AndroidRuntime(31641): at android.hardware.Camera.native_setup(Native Method)
410-03 17:03:10.345: E/AndroidRuntime(31641): at android.hardware.Camera.<init>(Camera.java:348)
510-03 17:03:10.345: E/AndroidRuntime(31641): at android.hardware.Camera.open(Camera.java:325)
610-03 17:03:10.345: E/AndroidRuntime(31641): at com.example.flashdance.FlashDance.run(FlashDance.java:60)
710-03 17:03:10.345: E/AndroidRuntime(31641): at java.lang.Thread.run(Thread.java:856)