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();
}

}

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" />