android 简单的原生Camera实现

此文为本人原创，作者：AIIK01   转载请标明~~

              废话不多说直接上代码：

主Activity：

package com.android.txz.basiccamera;


import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;


import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.FrameLayout;


import com.android.txz.basiccamera.util.Helper;
import com.android.txz.basiccamera.view.CameraPreview;


public class CameraActivity extends Activity {


private final static  String  TAG=CameraActivity.class.getSimpleName();
public static final int MEDIA_TYPE_IMAGE = 1;
    public static final int MEDIA_TYPE_VIDEO = 2;
    
    
    private Camera mCamera;
    private CameraPreview mPreview;
    private MediaRecorder mMediaRecorder;
    private boolean isRecording = false;
    
    


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //remove systemui
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        //remove actionbar
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        //keep the screen on 
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        
        setContentView(R.layout.activity_main);
        
        // Create an instance of Camera
        mCamera = new Helper().getCameraInstance();


        // Create our Preview view and set it as the content of our activity.
        mPreview = new CameraPreview(this, mCamera);
        FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
        preview.addView(mPreview);
        
     // Add a listener to the Capture button
        Button captureButton = (Button) findViewById(R.id.button_capture);
        captureButton.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // get an image from the camera
                    mCamera.takePicture(null, null, mPicture);
                    mCamera.startPreview();
                }
            }
        );
        
        final Button  recorderButton=(Button) findViewById(R.id.button_recorder);
        /*recorderButton.setOnClickListener(
           new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   if (isRecording) {
                       // stop recording and release camera
                       mMediaRecorder.stop();  // stop the recording
                       releaseMediaRecorder(); // release the MediaRecorder object
                       mCamera.lock();         // take camera access back from MediaRecorder


                       // inform the user that recording has stopped
                       //setCaptureButtonText("Capture");
                      
                       isRecording = false;
                   } else {
                       // initialize video camera
                       if (prepareVideoRecorder()) {
                           // Camera is available and unlocked, MediaRecorder is prepared,
                           // now you can start recording
                           mMediaRecorder.start();
                           //mCamera.startPreview();
                           // inform the user that recording has started
                           recorderButton.setText("Stop");
                           isRecording = true;
                       } else {
                           // prepare didn't work, release the camera
                           releaseMediaRecorder();
                           //mCamera.startPreview();
                           // inform user
                       }
                   }
               }
           }
        );*/
    }
    
    @Override
    protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    //mCamera.startPreview();
    }
    
    
    private static PictureCallback mPicture = new PictureCallback() {


        @Override
        public void onPictureTaken(byte[] data, Camera camera) {


            File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
            if (pictureFile == null){
                Log.d(TAG, "Error creating media file, check storage permissions");
                return;
            }
            try {
                FileOutputStream fos = new FileOutputStream(pictureFile);
                fos.write(data);
                fos.close();
            } catch (FileNotFoundException e) {
                Log.d(TAG, "File not found: " + e.getMessage());
            } catch (IOException e) {
                Log.d(TAG, "Error accessing file: " + e.getMessage());
            }
        }
    };
    
    




    /** Create a file Uri for saving an image or video */
    private static Uri getOutputMediaFileUri(int type){
          return Uri.fromFile(getOutputMediaFile(type));
    }


    /** Create a File for saving an image or video */
    private static File getOutputMediaFile(int type){
        // To be safe, you should check that the SDCard is mounted
        // using Environment.getExternalStorageState() before doing this.


        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                  Environment.DIRECTORY_PICTURES), "MyCameraApp");
        // This location works best if you want the created images to be shared
        // between applications and persist after your app has been uninstalled.


        // Create the storage directory if it does not exist
        if (! mediaStorageDir.exists()){
            if (! mediaStorageDir.mkdirs()){
                Log.d("MyCameraApp", "failed to create directory");
                return null;
            }
        }


        // Create a media file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new java.util.Date());
        File mediaFile;
        if (type == MEDIA_TYPE_IMAGE){
            mediaFile = new File(mediaStorageDir.getPath() + File.separator +
            "IMG_"+ timeStamp + ".jpg");
        } else if(type == MEDIA_TYPE_VIDEO) {
            mediaFile = new File(mediaStorageDir.getPath() + File.separator +
            "VID_"+ timeStamp + ".mp4");
        } else {
            return null;
        }


        return mediaFile;
    }
    
    private boolean prepareVideoRecorder(){


        mCamera = new Helper().getCameraInstance();
        mMediaRecorder = new MediaRecorder();


        // Step 1: Unlock and set camera to MediaRecorder
        mCamera.unlock();
        mMediaRecorder.setCamera(mCamera);


        // Step 2: Set sources
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);


        // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
        mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));


        // Step 4: Set output file
        mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());


        // Step 5: Set the preview output
        mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());


        // Step 6: Prepare configured MediaRecorder
        try {
            mMediaRecorder.prepare();
        } catch (IllegalStateException e) {
            Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage());
            releaseMediaRecorder();
            return false;
        } catch (IOException e) {
            Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
            releaseMediaRecorder();
            return false;
        }
        return true;
    }
    
    @Override
    protected void onPause() {
        super.onPause();
        //releaseMediaRecorder();       // if you are using MediaRecorder, release it first
        releaseCamera();              // release the camera immediately on pause event
    }


    private void releaseMediaRecorder(){
        if (mMediaRecorder != null) {
            mMediaRecorder.reset();   // clear recorder configuration
            mMediaRecorder.release(); // release the recorder object
            mMediaRecorder = null;
            mCamera.lock();           // lock camera for later use
        }
    }


    private void releaseCamera(){
        if (mCamera != null){
            mCamera.release();        // release the camera for other applications
            mCamera = null;
        }
    }


}

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
  <FrameLayout
    android:id="@+id/camera_preview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    />
  <LinearLayout 
      android:orientation="vertical"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      >
  <Button
    android:id="@+id/button_capture"
    android:text="Capture"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    
    />
  <Button
    android:id="@+id/button_recorder"
    android:text="Recorder"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    />
  </LinearLayout>
</LinearLayout>

辅助类：

package com.android.txz.basiccamera.util;


import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;


public class Helper {
     
/** A safe way to get an instance of the Camera object. */
public static Camera getCameraInstance(){
   Camera c = null;
   try {
       c = Camera.open(); // attempt to get a Camera instance
   }
   catch (Exception e){
       // Camera is not available (in use or does not exist)
   }
   return c; // returns null if camera is unavailable
}

/** Check if this device has a camera */
private boolean checkCameraHardware(Context context) {
   if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
       // this device has a camera
       return true;
   } else {
       // no camera on this device
       return false;
   }
}
}

控件：

package com.android.txz.basiccamera.view;


import java.io.IOException;


import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;


/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {

    private SurfaceHolder mHolder;
    private Camera mCamera;
    private final static String TAG=CameraPreview.class.getSimpleName();


    public CameraPreview(Context context, Camera camera) {
        super(context);
        mCamera = camera;
        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        // deprecated setting, but required on Android versions prior to 3.0
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }


    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, now tell the camera where to draw the preview.
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.startPreview();
        } catch (IOException e) {
            Log.d(TAG, "Error setting camera preview: " + e.getMessage());
        }
    }


    public void surfaceDestroyed(SurfaceHolder holder) {
        // empty. Take care of releasing the Camera preview in your activity.
    }


    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.


        if (mHolder.getSurface() == null){
          // preview surface does not exist
          return;
        }


        // stop preview before making changes
        try {
            mCamera.stopPreview();
        } catch (Exception e){
          // ignore: tried to stop a non-existent preview
        }


        // set preview size and make any resize, rotate or
        // reformatting changes here


        // start preview with new settings
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();


        } catch (Exception e){
            Log.d(TAG, "Error starting camera preview: " + e.getMessage());
        }
    }
}

主配置文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.txz.basiccamera"
    android:versionCode="1"
    android:versionName="1.0" >


    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />


    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity android:name=".CameraActivity"
          android:label="@string/app_name"


          android:screenOrientation="landscape">
          <!-- configure this activity to use landscape orientation -->


          <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
   </activity>
   </application>
   
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-feature android:name="android.hardware.camera" />
</manifest>