Android高清拍照

来源：互联网发布：黑马程序员javaee视频编辑：程序博客网时间：2024/04/26 08:58
拍照可以调用系统的相机进行拍照，拍完保存到相应的SD卡目录。最近要用到拍照这个功能，首先试了下调用相机拍照，保存到相应目录，然后用imageview显示的时候感觉，很模糊。可能是图片被压缩的太狠了。所以自己使用Camera写了一个拍照的功能，拍出来的还挺清晰的，不过文件有点大一张图片差不多1.7M。如果想拍高清图可以使用下面的代码。
代码很简单，我就不做过多解释了。
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package com.example.testsimple;  
  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.util.Date;  
  
import android.os.AsyncTask;  
import android.os.Bundle;  
import android.os.Environment;  
import android.app.Activity;  
import android.content.Intent;  
import android.graphics.Bitmap;  
import android.graphics.BitmapFactory;  
import android.graphics.PixelFormat;  
import android.hardware.Camera;  
import android.text.format.DateFormat;  
import android.util.Log;  
import android.view.KeyEvent;  
import android.view.Menu;  
import android.view.SurfaceHolder;  
import android.view.SurfaceView;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.ImageView;  
  
public class MainActivity extends Activity {  
  
    private SurfaceView surfaceView;    
    private SurfaceHolder surfaceHolder;    
    private Camera camera;    
    private File picture;    
    private Button btnSave;    
    private final static String TAG = "CameraActivity";    
    private ImageView open_picIcon;  
      
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
       /* Intent intent=new Intent(MainActivity.this,MyCameraActivity.class);  
        startActivity(intent);  
        finish();*/  
        setupViews();  
    }  
  
    private void setupViews(){    
        surfaceView = (SurfaceView) findViewById(R.id.camera_preview); // Camera interface to instantiate components    
        surfaceHolder = surfaceView.getHolder(); // Camera interface to instantiate components    
        surfaceHolder.addCallback(surfaceCallback); // Add a callback for the SurfaceHolder    
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    
            
        btnSave = (Button) findViewById(R.id.save_pic);  
        open_picIcon=(ImageView) findViewById(R.id.open_picIcon);  
            
        btnSave.setOnClickListener(new OnClickListener() {    
                
            @Override    
            public void onClick(View v) {  
                surfaceView.setVisibility(View.VISIBLE);  
                open_picIcon.setVisibility(View.GONE);  
                takePic();    
            }    
        });    
    }    
        
    @Override    
    public boolean onKeyDown(int keyCode, KeyEvent event) {    
        if (keyCode == KeyEvent.KEYCODE_CAMERA    
                || keyCode == KeyEvent.KEYCODE_SEARCH) {    
            takePic();    
            return true;    
        }    
        return super.onKeyDown(keyCode, event);    
    }    
    
    private void takePic() {    
    
        camera.stopPreview();// stop the preview    
    
        camera.takePicture(null, null, pictureCallback); // picture    
    }    
    
    // Photo call back    
    Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {    
        //@Override    
        public void onPictureTaken(byte[] data, Camera camera) {    
            new SavePictureTask().execute(data);    
            camera.startPreview();    
        }    
    };    
    
    // save pic    
    class SavePictureTask extends AsyncTask<byte[], String, String> {    
        @Override    
        protected String doInBackground(byte[]... params) {    
            String fname = DateFormat.format("yyyyMMddhhmmss", new Date()).toString()+".jpg";    
                
            Log.i(TAG, "fname="+fname+";dir="+Environment.getExternalStorageDirectory());    
            //picture = new File(Environment.getExternalStorageDirectory(),fname);// create file    
                
            picture = new File(Environment.getExternalStorageDirectory()+"/images/"+fname);    
           File file= picture.getParentFile();  
           if(!file.exists())  
                     file.mkdir();  
            try {    
                FileOutputStream fos = new FileOutputStream(picture.getPath()); // Get file output stream    
                fos.write(params[0]); // Written to the file    
                fos.close();     
            } catch (Exception e) {    
                e.printStackTrace();    
            }    
            return null;    
        }    
        @Override  
        protected void onPostExecute(String result) {  
            // TODO Auto-generated method stub  
            super.onPostExecute(result);  
              
            Bitmap bitmap=getDiskBitmap(picture.getPath());  
            surfaceView.setVisibility(View.GONE);  
            open_picIcon.setVisibility(View.VISIBLE);  
            open_picIcon.setImageBitmap(bitmap);  
        }  
          
    }    
    private Bitmap getDiskBitmap(String pathString)    
    {    
        Bitmap bitmap = null;    
        try    
        {    
            File file = new File(pathString);    
            if(file.exists())    
            {    
                bitmap = BitmapFactory.decodeFile(pathString);    
            }    
        } catch (Exception e)    
        {    
            // TODO: handle exception    
        }    
            
            
        return bitmap;    
    }    
    // SurfaceHodler Callback handle to open the camera, off camera and photo size changes    
    SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {    
    
        public void surfaceCreated(SurfaceHolder holder) {    
            Log.i(TAG, "surfaceCallback====");    
            camera = Camera.open(); // Turn on the camera    
            try {    
                camera.setPreviewDisplay(holder); // Set Preview    
            } catch (IOException e) {    
                camera.release();// release camera    
                camera = null;    
            }    
        }    
    
        public void surfaceChanged(SurfaceHolder holder, int format, int width,    
                int height) {    
            Log.i(TAG,"====surfaceChanged");    
            Camera.Parameters parameters = camera.getParameters(); // Camera parameters to obtain    
            parameters.setPictureFormat(PixelFormat.JPEG);// Setting Picture Format    
//          parameters.set("rotation", 180); // Arbitrary rotation    
            camera.setDisplayOrientation(0);    
            parameters.setPreviewSize(400, 300); // Set Photo Size    
            camera.setParameters(parameters); // Setting camera parameters    
            camera.startPreview(); // Start Preview    
        }    
    
        public void surfaceDestroyed(SurfaceHolder holder) {    
            Log.i(TAG,"====surfaceDestroyed");    
            camera.stopPreview();// stop preview    
            camera.release(); // Release camera resources    
            camera = null;    
        }    
    };    
}  
拍完以后自动保存到SD卡中的images目录下
下面是图片存放路径
1.8M 确实有点大，不过是高清图片，哈哈。
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