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;@Overrideprotected 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//srcpublic 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//srcpublic 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);}//CamCapprivate 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.SurfaceViewandroid: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>

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