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> 
