Android 自定义Camera 随笔

 

一、权限

 

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" android:required="false" />     这个false, 可以防止不让没有摄像头的设备安装
<uses-feature android:name="android.hardware.camera.autofocus" />  

        <activity
            android:name="com.smarttpanorama.ui.CaptureActivity"
            android:label="@string/app_name"
            android:screenOrientation="landscape">  设置横屏

 

 

 

 

 

二、布局文件

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
  <FrameLayout
	    android:id="@+id/FrameCaptureView"
	    android:layout_width="fill_parent"
	    android:layout_height="fill_parent"/>          这是用于放Camera的Frame框架
    
    <LinearLayout
        android:id="@+id/LinearCaptureLeft"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:background="@color/black"
        android:orientation="vertical">
        <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="fill_parent"
	        android:layout_weight="1.2">
	        <ImageView
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="fill_parent"
	            android:background="@drawable/camera_top_left"/>
        </LinearLayout>
        <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="fill_parent"
	        android:layout_weight="0.3"
	        android:gravity="left">

            <ImageView
                android:layout_width="@dimen/camera_h"
                android:layout_height="fill_parent"
                android:background="@drawable/camera_left_edge" />

	     </LinearLayout>
	      <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="fill_parent"
	        android:layout_weight="1.11"
	        android:gravity="center">

	          <Button
	              android:id="@+id/BtnCaptureLeft"
	              android:layout_width="@dimen/camera_h"
	              android:layout_height="@dimen/camera_h"
	              android:background="@drawable/btn_camera" />

         </LinearLayout>
    </LinearLayout>
 
    <LinearLayout
        android:id="@+id/LinearCaptureRight"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_alignParentRight="true"
        android:background="@color/black"
        android:orientation="vertical"
        android:gravity="right">
        
           <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="fill_parent"
	        android:layout_weight="1.2">
	        <ImageView
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="fill_parent"
	            android:background="@drawable/camera_top_right"/>
        </LinearLayout>
         <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="fill_parent"
	        android:layout_weight="0.3">
	        <ImageView
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="fill_parent"
	            android:background="@drawable/camera_right_edge" />
	     </LinearLayout>
	      <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="fill_parent"
	        android:layout_weight="1.11"
	        android:gravity="center">
	         <Button
	            android:id="@+id/BtnCaptureRight"
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="@dimen/camera_h"
	            android:background="@drawable/btn_camera" />
         </LinearLayout>
    </LinearLayout>

    
    
<!--     <com.smarttpapers.shoot4video.customview.CameraPreview
        android:id="@+id/preview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_toRightOf="@id/LinearCaptureLeft"
        android:layout_toLeftOf="@id/LinearCaptureRight"
        android:keepScreenOn="true" /> -->

    
    
    <!--
	    android:layout_toRightOf="@id/LinearCaptureLeft"
        android:layout_toLeftOf="@id/LinearCaptureRight"-->
      <ImageView
            android:id="@+id/IvCaptureLogo"
            android:layout_width="@dimen/logo_w"
            android:layout_height="@dimen/logo_h"
            android:layout_marginTop="5dip"
            android:layout_marginRight="@dimen/logo_margin_right"
            android:layout_alignParentTop="true"
            android:layout_alignParentRight="true"
            android:background="@drawable/logo_smartteye" />
      <ImageView
          android:id="@+id/IvCaptureAngel"
            android:layout_width="@dimen/angel_w"
            android:layout_height="@dimen/angel_h"
            android:layout_marginTop="10dip"
            android:layout_marginLeft="@dimen/angel_margin_left"
            android:background="@drawable/camera_angel" />
      
      
      <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:gravity="center"
	        android:layout_marginLeft="@dimen/logo_margin_right"
	        android:layout_marginBottom="8dip"
	        android:layout_alignParentBottom="true">
	         <Button
	            android:id="@+id/BtnCapture180"
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="@dimen/camera_btn_h"
	            android:background="@drawable/btn"
	            android:text="180°"
	            android:textSize="@dimen/camera_text_size" />
	         <Button
	            android:id="@+id/BtnCaptureFile"
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="@dimen/camera_btn_h"
	            android:layout_marginLeft="10dip"
	            android:background="@drawable/btn"
	            android:text="File"  
	            android:textSize="@dimen/camera_text_size" />
	         
	         
         </LinearLayout>

      
         <LinearLayout
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:gravity="center"
	        android:layout_marginRight="@dimen/logo_margin_right"
	        android:layout_alignParentBottom="true"
	        android:layout_marginBottom="8dip"
	        android:layout_alignParentRight="true">
	        
	         <Button
	            android:id="@+id/BtnCaptureSave"
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="@dimen/camera_btn_h"
	            android:background="@drawable/btn"
	            android:text="Save"  
	            android:textSize="@dimen/camera_text_size" />
	         <Button
	            android:id="@+id/BtnCaptureEdit"
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="@dimen/camera_btn_h"
	            android:layout_marginLeft="10dip"
	            android:background="@drawable/btn"
	            android:text="Edit"  
	            android:textSize="@dimen/camera_text_size" />
	         <Button
	            android:id="@+id/BtnCaptureMerge"
	            android:layout_width="@dimen/camera_h"
	            android:layout_height="@dimen/camera_btn_h"
	            android:layout_marginLeft="10dip"
	            android:background="@drawable/btn"
	            android:text="Merge"  
	            android:textSize="@dimen/camera_text_size" />
	         
         </LinearLayout>
</RelativeLayout>

 

三、创建CameraPriview类,继承自SurfaceView。

 

 

 

 

package com.smarttpanorama.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;

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback{
	private SurfaceHolder mHolder;
	private Camera mCamera;
	
	@SuppressWarnings("deprecation")
	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);
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		// 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());
        }
    }


	@Override
	public void surfaceCreated(SurfaceHolder holder) {
        if(null != mCamera)
		  {
		
			// The Surface has been created, now tell the camera where to draw the preview.
	        	
	            try {
                	mCamera.setPreviewDisplay(holder);//通过surfaceview显示取景画面
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
	        	
	        	
	            mCamera.startPreview();
	     
		  }

	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {

		  if(null != mCamera)
		  {
			   mCamera.setPreviewCallback(null); //!!这个必须在前,不然退出出错
			   mCamera.stopPreview(); 
			   mCamera.release();
			   mCamera = null;
		  }
	}


}

 

注意:在OnDestroy里已经写过release()释放过程。在Activity的Onpause里就不要再写一遍了,否则会出现 method called  after release()错误

 

三、CaptureActivity.java

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;
import com.smarttpanorama.tools.Constant;
import com.smarttpanorama.view.CameraPreview;
import com.smarttpapers.smarttpanorama.R;

public class CaptureActivity extends Activity {

	public static final int MEDIA_TYPE_IMAGE = 1;
//	public static final int MEDIA_TYPE_VIDEO = 2;

	
    private Camera mCamera;
    private CameraPreview mPreview;
  
    private Button BtnCapureLeft;
    private Button BtnCapureRight;
    
    private static int picCount = 0;
    
    //将拍照结果存入文件
    private PictureCallback mPicture = new PictureCallback() {

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

	    	//得到文件名
	        File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
	        if (pictureFile == null){
	            Log.d("TAG", "Error creating media file, check storage permissions");
	            return;
	        }

	        //写入文件
	        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());
	        }
	        
	        
	        //显示在上边
	    }
	};
    
    
	@SuppressLint("NewApi")
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_capture);
        
        findViews();
        if(checkCameraHardware(this) == false){
        	Toast.makeText(this, "no camera on this device", Toast.LENGTH_LONG)
        		.show();
        }else{
	        // Create an instance of Camera
//	        mCamera = Constant.getCameraInstance(); //正常情况下这样调用。每种设备默认摄像头不同。但是现在默认要得到后置摄像头
        	
        	
	        //切换前后摄像头
            int cameraCount = 0;
            CameraInfo cameraInfo = new CameraInfo();
            cameraCount = Camera.getNumberOfCameras();//得到摄像头的个数

            Log.w("摄像头数量",cameraCount+"");
            
            
            for(int i = 0; i < cameraCount; i++) {
                Camera.getCameraInfo(i, cameraInfo);//得到每一个摄像头的信息
              
                //代表摄像头的方位,CAMERA_FACING_FRONT前置      CAMERA_FACING_BACK后置
                    if(cameraInfo.facing  == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                    	 Log.w("摄像头","前置");
//                    	 mCamera.setPreviewCallback(null); //!!这个必须在前,不然退出出错
//                        mCamera.stopPreview();//停掉原来摄像头的预览
//                        mCamera.release();//释放资源
//                        mCamera = null;//取消原来摄像头
                          mCamera = Camera.open(i);//打开当前选中的摄像头
//                        try {
//                        	mCamera.setPreviewDisplay(holder);//通过surfaceview显示取景画面
//                        } catch (IOException e) {
//                            // TODO Auto-generated catch block
//                            e.printStackTrace();
//                        }
//                        mCamera.startPreview();//开始预览
                        break;
                    }

            }
        	
        	
        	
        	
	        // Create our Preview view and set it as the content of our activity.
	        mPreview = new CameraPreview(this, mCamera);
//	        mPreview = new CameraPreview(this);
	        FrameLayout preview = (FrameLayout) findViewById(R.id.FrameCaptureView);
	        preview.addView(mPreview);
	        
	        SetListener();
        }
    }

	@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    
    @Override
    protected void onPause() {
        super.onPause();
    }
    
	
	
	private void captureAndStartShowPic(){
		

		  if(null != mCamera)
		  {
			mCamera.autoFocus(new AutoFocusCallback() {//自动对焦
	            @Override
	            public void onAutoFocus(boolean success, Camera camera) {
	                if(success) {
//	                   	//设置参数,并拍照
//	                    Parameters params = camera.getParameters();
//	                    params.setPictureFormat(PixelFormat.JPEG);//图片格式
//	                    params.setPreviewSize(800, 480);//图片大小
//	                    camera.setParameters(params);//将参数设置到我的camera
	                    camera.takePicture(null, null, mPicture);//将拍摄到的照片给自定义的对象
	                }
	            }
	        });
			
			 // get an image from the camera
//	         mCamera.takePicture(null, null, mPicture);
	        
//	        Intent intent = new Intent();
//	        intent.setClass(this, ShowPicActivity.class);
//	        startActivity(intent);
		  }
	}
	

    
    /** 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;
        }
    }
    
    /** 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_DCIM), "Camera");
                  Environment.DIRECTORY_PICTURES), "SmarttEye");
        
        
        // 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("Camera", "failed to create directory");
                return null;
            }
        }

        // Create a media file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        File mediaFile;
        if (type == MEDIA_TYPE_IMAGE){
        	String FileName = mediaStorageDir.getPath() + File.separator +
                    "IMG_"+ timeStamp + ".jpg";
        	if(picCount % 2 == 0){
        		Constant.FIRST_FILE_NAME = FileName;
        	}else{
        		Constant.SECOND_FILE_NAME = FileName;
        	}
            mediaFile = new File(FileName);
            
//        } else if(type == MEDIA_TYPE_VIDEO) {
//            mediaFile = new File(mediaStorageDir.getPath() + File.separator +
//            "VID_"+ timeStamp + ".mp4");
        } else {
            return null;
        }

        return mediaFile;
    }
    
    
    private void SetListener() {
    	// Add a listener to the Capture button
		BtnCapureLeft.setOnClickListener(
    	    new View.OnClickListener() {
    	        @Override
    	        public void onClick(View v) {
    	        	picCount++;
    	        	
    	        	captureAndStartShowPic();
    	            
    	        }
    	    }
    	);
		
		BtnCapureRight.setOnClickListener(
    	    new View.OnClickListener() {
    	        @Override
    	        public void onClick(View v) {
    	        	picCount++;
    	        	
    	        	captureAndStartShowPic();
    	        }
    	    }
    	);
	}
    
    private void findViews() {
		BtnCapureLeft = (Button) findViewById(R.id.BtnCaptureLeft);
		BtnCapureRight = (Button) findViewById(R.id.BtnCaptureRight);
	}
}

 

 

 

在这个程序中。默认使用后置摄像头。所以注释掉了一部分代码。如果程序中需要手动切换摄像头。需要先release()掉之前的摄像头。再启动另一个。

前置后置摄像头的交换,要放在Activity里。否则在CameraPreview里切换了摄像头。之前的已经release掉了。Activity里再进行操作  就会报错(猜测)

 

 四、保存的路径

 

         File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
//           	  Environment.DIRECTORY_DCIM), "Camera");   这个路径 是系统拍照保存的路径。在根路经DCIM\Camera
                  Environment.DIRECTORY_PICTURES), "SmarttEye");   这个是获取系统图片存放的路径。在根目录的“pictures”处

注意有些程序,在自定义camera拍完后,显示在图库中有延迟

 

五、拍照  得到的data  在这里。取到ImageView里边的时候。可以使用data。但是很多文章里,写会很费内存

 

 private PictureCallback mPicture = new PictureCallback() {

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

	    //得到文件名
        File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
	        if (pictureFile == null){
	            Log.d("TAG", "Error creating media file, check storage permissions");
	            return;
	        }

	        //写入文件
        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());
	        }
	        
	        
	        //显示在上边
    }
	};

 

 

 

 

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Android 自定义Camera 随笔

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