Android的错误而Camera.open（） [英] Android Error while Camera.open()

问题描述

我只是想尝试在Android上使用我的摄影机。我不知道我能得到错误日志，但我得到一个错误，当我调用函数Camera.open（）。

使用IM的SDK例如code，但它没有工作。

我也尝试了设置mCamera发布之前为null。是的，我已经设置好的权限在manifest.xml

它没有与模拟器的作品，即使我的HTC

 包com.example.android.apis.graphics;进口android.app.Activity;
进口android.content.Context;
进口android.hardware.Camera;
进口android.os.Bundle;
进口android.view.SurfaceHolder;
进口android.view.SurfaceView;
进口android.view.Window;
进口java.io.IOException异常;
公共类相机preVIEW延伸活动{
    私人preVIEW米preVIEW;@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;    //隐藏窗口的标题。
    requestWindowFeature（Window.FEATURE_NO_TITLE）;    //创建我们的preVIEW查看和设置它作为我们活动的内容。
    米preVIEW =新的preVIEW（本）;
    的setContentView（M preVIEW）;
}}
类preVIEW延伸SurfaceView实现SurfaceHolder.Callback {
    SurfaceHolder mHolder;
    相机mCamera;
preVIEW（上下文的背景下）{
    超级（上下文）;    //安装SurfaceHolder.Callback所以我们得到通知时，
    //创建下垫面和销毁。
    mHolder = getHolder（）;
    mHolder.addCallback（本）;
    mHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）;
}公共无效surfaceCreated（SurfaceHolder持有人）{
    //表面有被创建，获取摄像机，并告诉它在哪里
    //绘制。
    mCamera = Camera.open（）;
    尝试{
       mCamera.set previewDisplay（支架）;
    }赶上（IOException异常除外）{
        mCamera.release（）;
        mCamera = NULL;
        // TODO：在此处增加更多的异常处理逻辑
    }
}公共无效surfaceDestroyed（SurfaceHolder持有人）{
    //当我们回到地面就会被破坏，因此停止preVIEW。
    //因为CameraDevice对象不是共享资源，这是非常
    //重要的是释放它当活动被暂停。
    mCamera.stop preVIEW（）;
    mCamera.release（）;
    mCamera = NULL;
}公共无效surfaceChanged（SurfaceHolder架，INT格式，诠释W，INT高）{
    //现在，尺寸是已知的，设置相机参数，并开始
    //将preVIEW。
    Camera.Parameters参数= mCamera.getParameters（）;
    parameters.set previewSize（W，H）;
    mCamera.setParameters（参数）;
    mCamera.start preVIEW（）;
}}
 

解决方案

看一看在接受的答案<一提供的code href=\"http://stackoverflow.com/questions/7942378/android-camera-will-not-work-start$p$pview-fails\">here.它应该帮助您开始。

编辑：嗯，你logcat的错误建议你不要在你的清单文件以下行（结束下面的一个＆LT; /用途＆gt; 元素：

 ＆LT;使用许可权的android：NAME =android.permission.CAMERA/＆GT;
＆LT;使用特征的android：NAME =android.hardware.camera/＆GT;
 

i just wanna try to Access my Camera on Android. I dont know how i can get error logs, but i get an error when i call the function Camera.open().

Im using the SDK example Code, but it didnt works.

I also tried out to set mCamera to null before releasing. And yes i have setted the permission in the manifest.xml

it didnt works with the emulator even with my htc

package com.example.android.apis.graphics;

import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import java.io.IOException;


public class CameraPreview extends Activity {    
    private Preview mPreview;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Hide the window title.
    requestWindowFeature(Window.FEATURE_NO_TITLE);

    // Create our Preview view and set it as the content of our activity.
    mPreview = new Preview(this);
    setContentView(mPreview);
}

}


class Preview extends SurfaceView implements SurfaceHolder.Callback {
    SurfaceHolder mHolder;
    Camera mCamera;


Preview(Context context) {
    super(context);

    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

public void surfaceCreated(SurfaceHolder holder) {
    // The Surface has been created, acquire the camera and tell it where
    // to draw.
    mCamera = Camera.open();
    try {
       mCamera.setPreviewDisplay(holder);
    } catch (IOException exception) {
        mCamera.release();
        mCamera = null;
        // TODO: add more exception handling logic here
    }
}

public void surfaceDestroyed(SurfaceHolder holder) {
    // Surface will be destroyed when we return, so stop the preview.
    // Because the CameraDevice object is not a shared resource, it's very
    // important to release it when the activity is paused.
    mCamera.stopPreview();
    mCamera.release();
    mCamera = null;
}

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    // Now that the size is known, set up the camera parameters and begin
    // the preview.
    Camera.Parameters parameters = mCamera.getParameters();
    parameters.setPreviewSize(w, h);
    mCamera.setParameters(parameters);
    mCamera.startPreview();
}

}

解决方案

Have a look at the code provided in the accepted answer here. It should help get you started.

Edit: Ah, your logcat error suggests that you don't have one of the following lines in your manifest file (below the end </application> element:

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

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