机器人:camera.getParameters()崩溃的应用程序 [英] android : camera.getParameters() crashes app
问题描述
我使用这个code使用摄像头LED作为手电筒,但它崩溃了服务启动时。使用Log.w()语句我发现它在参数停止= camera.getParameters();我已经包括了android.permission.CAMERA在我的清单。我不明白是什么原因造成飞机坠毁。我该如何解决这个问题?
公共类手电筒延伸服务{
私人摄像头摄像头;
私人参数参数;
私人最终的IBinder mBinder =新LocalBinder();
公共类LocalBinder扩展粘合剂{
手电筒的getService(){
返回Flashlight.this;
}
}
公众诠释onStartCommand(意向意图,诠释标志,诠释startId){
Log.w(1,camera.open);
Camera.open();
Log.w(1,camera.getParameters);
参数= camera.getParameters();
Log.w(1,我得到了摄像头参数);
名单<字符串> PLIST = camera.getParameters()getSupportedFlashModes()。
如果(pList.contains(Parameters.FLASH_MODE_TORCH)){
param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
}
否则,如果(pList.contains(Parameters.FLASH_MODE_ON)){
param.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
}
param.setFocusMode(Camera.Parameters.FOCUS_MODE_INFINITY);
尝试{
camera.setParameters(参数);
camera.start preVIEW();
}
赶上(例外五){
Toast.makeText(getApplicationContext(),您的设备不具备闪光灯的支持,Toast.LENGTH_SHORT).show();
}
返回START_STICKY;
}
@覆盖
公共无效的onDestroy(){
// TODO自动生成方法存根
super.onDestroy();
参数P = camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(对);
camera.stop preVIEW();
camera.release();
}
@覆盖
公众的IBinder onBind(意向意图){
返回mBinder;
}
}
这是LogCcat
12-15 15:44:32.037:W / 1(26304):camera.open
12-15 15:44:32.347:W / 1(26304):camera.getParameters
12-15 15:44:32.347:D / AndroidRuntime(26304):关闭虚拟机
12-15 15:44:32.347:W / dalvikvm(26304):主题ID = 1:螺纹退出与未捕获的异常(组= 0x40a9e228)
12-15 15:44:32.357:E / AndroidRuntime(26304):致命异常:主要
12-15 15:44:32.357:E / AndroidRuntime(26304):java.lang.RuntimeException的:无法启动服务com.bill.deuterh.Flashlight@40dd0978意图{CMP = com.bill.deuterh / .Flashlight}:显示java.lang.NullPointerException
12-15 15:44:32.357:E / AndroidRuntime(26304):在android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2738)
12-15 15:44:32.357:E / AndroidRuntime(26304):在android.app.ActivityThread.access $ 1900年(ActivityThread.java:139)
12-15 15:44:32.357:E / AndroidRuntime(26304):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1334)
12-15 15:44:32.357:E / AndroidRuntime(26304):在android.os.Handler.dispatchMessage(Handler.java:99)
12-15 15:44:32.357:E / AndroidRuntime(26304):在android.os.Looper.loop(Looper.java:154)
12-15 15:44:32.357:E / AndroidRuntime(26304):在android.app.ActivityThread.main(ActivityThread.java:4945)
12-15 15:44:32.357:E / AndroidRuntime(26304):在java.lang.reflect.Method.invokeNative(本机方法)
12-15 15:44:32.357:E / AndroidRuntime(26304):在java.lang.reflect.Method.invoke(Method.java:511)
12-15 15:44:32.357:E / AndroidRuntime(26304):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784)
12-15 15:44:32.357:E / AndroidRuntime(26304):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-15 15:44:32.357:E / AndroidRuntime(26304):在dalvik.system.NativeStart.main(本机方法)
12-15 15:44:32.357:E / AndroidRuntime(26304):由:显示java.lang.NullPointerException
12-15 15:44:32.357:E / AndroidRuntime(26304):在com.bill.deuterh.Flashlight.onStartCommand(Flashlight.java:32)
12-15 15:44:32.357:E / AndroidRuntime(26304):在android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2715)
12-15 15:44:32.357:E / AndroidRuntime(26304):10 ...更多
我终于想通了大量的试验结束error.i'm后公布正确的$ C $下获得parameteres,为其他用户解决这个问题
摄像头= Camera.open();
Camera.Parameters参数= camera.getParameters();
添加一个条件,以检查对象是空的第一:
摄像头= Camera.open();
如果(camera.getParameters()!= NULL){
Camera.Parameters参数= camera.getParameters();
}
i'm using this code to use the camera LED as flashlight but it crashes when the service starts. Using Log.w() statements i found it stops at param = camera.getParameters();. i have included the android.permission.CAMERA in my manifest. i don't understand what causes the crash. how can i fix this?
public class Flashlight extends Service {
private Camera camera;
private Parameters param;
private final IBinder mBinder = new LocalBinder();
public class LocalBinder extends Binder {
Flashlight getService() {
return Flashlight.this;
}
}
public int onStartCommand(Intent intent, int flags, int startId) {
Log.w("1","camera.open");
Camera.open();
Log.w("1","camera.getParameters");
param = camera.getParameters();
Log.w("1","i got camera parameters");
List<String> pList = camera.getParameters().getSupportedFlashModes();
if(pList.contains(Parameters.FLASH_MODE_TORCH)){
param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
}
else if(pList.contains(Parameters.FLASH_MODE_ON)){
param.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
}
param.setFocusMode(Camera.Parameters.FOCUS_MODE_INFINITY);
try{
camera.setParameters(param);
camera.startPreview();
}
catch (Exception e){
Toast.makeText(getApplicationContext(), "Your device does not have flash light support", Toast.LENGTH_SHORT).show();
}
return START_STICKY;
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Parameters p=camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
camera.stopPreview();
camera.release();
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
}
this is the LogCcat
12-15 15:44:32.037: W/1(26304): camera.open
12-15 15:44:32.347: W/1(26304): camera.getParameters
12-15 15:44:32.347: D/AndroidRuntime(26304): Shutting down VM
12-15 15:44:32.347: W/dalvikvm(26304): threadid=1: thread exiting with uncaught exception (group=0x40a9e228)
12-15 15:44:32.357: E/AndroidRuntime(26304): FATAL EXCEPTION: main
12-15 15:44:32.357: E/AndroidRuntime(26304): java.lang.RuntimeException: Unable to start service com.bill.deuterh.Flashlight@40dd0978 with Intent { cmp=com.bill.deuterh/.Flashlight }: java.lang.NullPointerException
12-15 15:44:32.357: E/AndroidRuntime(26304): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2738)
12-15 15:44:32.357: E/AndroidRuntime(26304): at android.app.ActivityThread.access$1900(ActivityThread.java:139)
12-15 15:44:32.357: E/AndroidRuntime(26304): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1334)
12-15 15:44:32.357: E/AndroidRuntime(26304): at android.os.Handler.dispatchMessage(Handler.java:99)
12-15 15:44:32.357: E/AndroidRuntime(26304): at android.os.Looper.loop(Looper.java:154)
12-15 15:44:32.357: E/AndroidRuntime(26304): at android.app.ActivityThread.main(ActivityThread.java:4945)
12-15 15:44:32.357: E/AndroidRuntime(26304): at java.lang.reflect.Method.invokeNative(Native Method)
12-15 15:44:32.357: E/AndroidRuntime(26304): at java.lang.reflect.Method.invoke(Method.java:511)
12-15 15:44:32.357: E/AndroidRuntime(26304): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-15 15:44:32.357: E/AndroidRuntime(26304): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-15 15:44:32.357: E/AndroidRuntime(26304): at dalvik.system.NativeStart.main(Native Method)
12-15 15:44:32.357: E/AndroidRuntime(26304): Caused by: java.lang.NullPointerException
12-15 15:44:32.357: E/AndroidRuntime(26304): at com.bill.deuterh.Flashlight.onStartCommand(Flashlight.java:32)
12-15 15:44:32.357: E/AndroidRuntime(26304): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2715)
12-15 15:44:32.357: E/AndroidRuntime(26304): ... 10 more
i finally figured it out after a lot of trial end error.i'm posting the correct code for getting the parameteres, for other users with this problem
camera = Camera.open();
Camera.Parameters param = camera.getParameters();
Add a condition to check if the object is null first:
camera = Camera.open();
if (camera.getParameters()!=null) {
Camera.Parameters param = camera.getParameters();
}
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