Android 4.4摄像头捕获,无预览/UI
我试图在Nexus5Android4.4.3上触发一个照片捕获,而不触发任何UI或预览。我在这个网站和其他网站上看到了几种方法,但它们似乎是特定于设备的,或者与最新版本的Android不兼容。我是Android开发的新手,所以我可能缺少一些基本的东西,我非常感谢提供的任何帮助 这是我的密码:Android 4.4摄像头捕获,无预览/UI,android,user-interface,camera,preview,Android,User Interface,Camera,Preview,我试图在Nexus5Android4.4.3上触发一个照片捕获,而不触发任何UI或预览。我在这个网站和其他网站上看到了几种方法,但它们似乎是特定于设备的,或者与最新版本的Android不兼容。我是Android开发的新手,所以我可能缺少一些基本的东西,我非常感谢提供的任何帮助 这是我的密码: package com.example.omnisense; import java.io.File; import java.io.FileOutputStream; import java.io.IO
package com.example.omnisense;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.content.Context;
import android.content.Intent;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.Size;
import android.os.Environment;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class Sensor_Camera {
private Camera mCamera;
private Context context;
private SurfaceView sv;
private Parameters parameters;
private int width;
private int height;
private Size size;
public Sensor_Camera(Context c_){
context = c_;
sv = new SurfaceView(context);
if (Camera.getNumberOfCameras() >= 2) {
mCamera = Camera.open(CameraInfo.CAMERA_FACING_FRONT);
} else {
mCamera = Camera.open();
}
}
public void takePicture() {
try {
mCamera.setPreviewDisplay(sv.getHolder());
parameters = mCamera.getParameters();
size = parameters.getPictureSize();
width = size.width;
height = size.height;
// Default picture format is NV21
mCamera.setParameters(parameters);
mCamera.startPreview();
mCamera.takePicture(null, null, mCall);
} catch (IOException e) {
e.printStackTrace();
}
}
private Camera.PictureCallback mCall = new Camera.PictureCallback() {
@Override
public void onPictureTaken(final byte[] data, Camera camera) {
// Do Stuff
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
};
}
以下是我发现的与此相关的问题/答案/博客帖子:
以下是相关的logcat输出:
06-09 01:25:22.831: D/Main(20056): onClick
06-09 01:25:22.831: D/Main(20056): testButton Click
06-09 01:25:23.111: D/Camera(20056): app passed NULL surface
06-09 01:25:23.121: D/AndroidRuntime(20056): Shutting down VM
06-09 01:25:23.121: W/dalvikvm(20056): threadid=1: thread exiting with uncaught exception (group=0x41d2bba8)
06-09 01:25:23.121: E/AndroidRuntime(20056): FATAL EXCEPTION: main
06-09 01:25:23.121: E/AndroidRuntime(20056): Process: com.example.omnisense, PID: 20056
06-09 01:25:23.121: E/AndroidRuntime(20056): java.lang.RuntimeException: takePicture failed
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.hardware.Camera.native_takePicture(Native Method)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.hardware.Camera.takePicture(Camera.java:1244)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.hardware.Camera.takePicture(Camera.java:1189)
06-09 01:25:23.121: E/AndroidRuntime(20056): at com.example.omnisense.Sensor_Camera.takePicture(Sensor_Camera.java:60)
06-09 01:25:23.121: E/AndroidRuntime(20056): at com.example.omnisense.MainActivity.testButtonPress(MainActivity.java:172)
06-09 01:25:23.121: E/AndroidRuntime(20056): at com.example.omnisense.MainActivity$2.onClick(MainActivity.java:235)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.view.View.performClick(View.java:4438)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.view.View$PerformClick.run(View.java:18422)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.os.Handler.handleCallback(Handler.java:733)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.os.Handler.dispatchMessage(Handler.java:95)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.os.Looper.loop(Looper.java:136)
06-09 01:25:23.121: E/AndroidRuntime(20056): at android.app.ActivityThread.main(ActivityThread.java:5017)
06-09 01:25:23.121: E/AndroidRuntime(20056): at java.lang.reflect.Method.invokeNative(Native Method)
06-09 01:25:23.121: E/AndroidRuntime(20056): at java.lang.reflect.Method.invoke(Method.java:515)
06-09 01:25:23.121: E/AndroidRuntime(20056): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-09 01:25:23.121: E/AndroidRuntime(20056): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-09 01:25:23.121: E/AndroidRuntime(20056): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:133)
06-09 01:25:23.121: E/AndroidRuntime(20056): at dalvik.system.NativeStart.main(Native Method)
在我的主要活动中,该类与以下代码一起使用:
Sensor_Camera sense_camera = new Sensor_Camera(this);
sense_camera.takePicture();
我已经为相机添加了使用权限和使用功能。我不确定问题出在哪里,尽管我认为这与使用空的SurfaceView有关。是否有任何解决方法,或者在4.4中是不可能的
如果有任何关于我的代码我应该张贴,请让我知道!提前感谢您提供的所有帮助。查看,您正在使用postview回调,他们会注意到
当缩放、完全处理后的后视图
图像可用注意:并非所有硬件都支持此功能
听起来您的设备可能不支持此功能,因此您可能需要使用jpeg回调函数作为第四个可选参数。谢谢您的建议。我试试这个。