Android开发之拍照功能实现

参考链接：http://www.linuxidc.com/Linux/2013-11/92892p3.htm

原文链接：http://blog.csdn.net/tangcheng_ok/article/details/7036871

增加使用相机和写入权限：

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

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

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

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

主程序代码：

package com.example.carejulygpsmap;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Date;  

import android.app.Activity;

import android.content.pm.ActivityInfo;

import android.graphics.PixelFormat;

import android.hardware.Camera;

import android.os.AsyncTask;

import android.os.Bundle;

import android.os.Environment;

import android.text.format.DateFormat;

import android.util.Log;

import android.view.KeyEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.view.Window;

import android.view.View.OnClickListener;

import android.widget.Button; 

import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.provider.MediaStore;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

public class CareJulyActivity extends ActionBarActivity {

    private final static String TAG = "CameraActivity";

    private SurfaceView surfaceView;

    private SurfaceHolder surfaceHolder;

    private Camera camera;

    private File picture;

    private Button btnSave;  

    private static final int NONE = 0;

    private static final int PHOTO_GRAPH = 1;// 拍照

    private static final int PHOTO_ZOOM = 2; // 缩放

    private static final int PHOTO_RESOULT = 3;// 结果

    private static final String IMAGE_UNSPECIFIED = "image/*";

    private ImageView imageView = null;

    private Button btnPhone = null;

    private Button btnTakePicture = null;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        this.requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.activity_care_july);

        setupViews();

//        imageView = (ImageView) findViewById(R.id.imageView);

//        btnPhone = (Button) findViewById(R.id.btnPhone);

//        btnPhone.setOnClickListener(onClickListener);

//        btnTakePicture = (Button) findViewById(R.id.btnTakePicture);

//        btnTakePicture.setOnClickListener(onClickListener);

	}

//	@Override//src

//	protected void onCreate(Bundle savedInstanceState) {

//		super.onCreate(savedInstanceState);

//		setContentView(R.layout.activity_care_july);

//	}

	@Override//src

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.care_july, menu);

		return true;

	}

	@Override//src

	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);

	}

	//CamCap

    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);  

        btnSave.setOnClickListener(new OnClickListener() {  

            @Override

            public void onClick(View v) {

                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

    //保存图片，不过保存的图片较小，保存在根目录 的wishchin文件夹里面

    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()+"/wishchin/"+fname);  

            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;

        }

    }  

    // 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;

        }

    };

}

界面代码：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >  

    <android.view.SurfaceView

        android:id="@+id/camera_preview"

        android:layout_width="462dp"

        android:layout_height="534dp"

        android:layout_alignParentTop="true"

        android:layout_centerInParent="true"

        android:layout_gravity="center_vertical|center_horizontal" />

    <Button

        android:id="@+id/save_pic"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="txt_save" />  

</LinearLayout>

巴特西

Android开发之拍照功能实现

最新文章

热门文章