android从相机和相册中获取图片

之前做项目时有用到拍照获取图片这个功能，针对项目抽取出来了主要的代码，其中一些是来自于网上其他朋友的，在此说明！好废话不多说了。。。

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.simpletakepicture.MainActivity" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="拍照"
android:id="@+id/take_picture_btn"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="相册"
android:id="@+id/album_choice_btn"
android:layout_toRightOf="@+id/take_picture_btn"
/>
<ImageView
android:layout_width="200dp"
android:layout_height="400dp"
android:layout_centerInParent="true"
android:id="@+id/image_preview"
android:src="@drawable/ic_launcher"
/>

</RelativeLayout>

MainActivity

package com.example.simpletakepicture;

import java.io.File;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

/**
*
* @author wangyangzi
* 拍照获取图片和从相册选择获取图片。不管怎样获取都会封装成一个PhotoInfo对象，包含了图片的sdcard路径，缩略图
* 为的就是上传到服务器时方便查找，通过File转Base64格式上传。本例子不包含上传功能,部分代码来自网上
*
*/
public class MainActivity extends ActionBarActivity {

private Button takePictureBtn;
private Button albumChoiceBtn;
private ImageView previewImg;

private static final int TAKE_PICTURE = 0;
private static final int CHOOSE_PICTURE = 1;
private static final int SCALE = 5;
private static final String tempPhotoDir = Environment.getExternalStorageDirectory().getAbsolutePath() + "/wyz/";

private String photoName;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

takePictureBtn = (Button) this.findViewById(R.id.take_picture_btn);
albumChoiceBtn = (Button) this.findViewById(R.id.album_choice_btn);
previewImg = (ImageView) this.findViewById(R.id.image_preview);

//拍照
takePictureBtn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
Intent tpIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File dir = new File(tempPhotoDir);
if (!dir.exists()) {
dir.mkdirs();
}
//将图片保存进原始目录
photoName = String.valueOf(System.currentTimeMillis());
tpIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(tempPhotoDir + photoName + ".png")));
startActivityForResult(tpIntent, TAKE_PICTURE);
}
else {
Toast.makeText(MainActivity.this, "请确认已经插入SD卡", Toast.LENGTH_LONG).show();
}

}
});
//相册选择
albumChoiceBtn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");//相片类型
startActivityForResult(intent, CHOOSE_PICTURE);
}
});
}

//获取相机或相册的照片
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
PhotoInfo photoInfo = new PhotoInfo();
Bitmap bitmap = null;
String photoPath = "";
try{
if(resultCode != RESULT_CANCELED){
if (requestCode == CHOOSE_PICTURE) {
//照片的原始资源地址
Uri originalUri = data.getData();
//使用ContentProvider通过URI获取原始图片
Bitmap photo = MediaStore.Images.Media.getBitmap(getContentResolver(), originalUri);
if (photo != null) {
//为防止原始图片过大导致内存溢出，这里先缩小原图显示，然后释放原始Bitmap占用的内存
bitmap = ImageTools.zoomBitmap(photo, photo.getWidth() / SCALE, photo.getHeight() / SCALE);
//释放原始图片占用的内存，防止out of memory异常发生
photo.recycle();
//获取相册图片的SDCard路径
photoPath = ImageTools.getRealFilePath(this,originalUri);
}
} else if (requestCode == TAKE_PICTURE ) {
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmapOptions.inSampleSize = 8;
int degree = ImageTools.readPictureDegree(tempPhotoDir + photoName + ".png");
bitmap = BitmapFactory.decodeFile(tempPhotoDir + photoName + ".png",bitmapOptions);
bitmap = ImageTools.rotaingImageView(degree, bitmap);
photoPath = tempPhotoDir + photoName + ".png";
}
//构建PhotoInfo对象,此对象可以保存进adapter，用于后续业务处理...
photoInfo.setThumbnail(bitmap);
photoInfo.setPhotoSDCardPath(photoPath);
//预览图片
previewPhoto(photoInfo);
}
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 预览图片
* @param photoInfo
*/
private void previewPhoto(PhotoInfo photoInfo){
Toast.makeText(this, "获得图片>>" + photoInfo.getPhotoSDCardPath(), Toast.LENGTH_SHORT).show();
previewImg.setImageBitmap(photoInfo.getThumbnail());
}

}

ImageTools

package com.example.simpletakepicture;

import java.io.IOException;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;
import android.provider.MediaStore;

public class ImageTools {
public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = ((float) width / w);
float scaleHeight = ((float) height / h);
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
return newbmp;
}

public static int readPictureDegree(String path) {
int degree = 0;
try {
ExifInterface exifInterface = new ExifInterface(path);
int orientation = exifInterface.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
degree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
degree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
degree = 270;
break;
}
} catch (IOException e) {
e.printStackTrace();
}
return degree;
}

public static Bitmap rotaingImageView(int angle, Bitmap bitmap) {
// 旋转图片 动作
Matrix matrix = new Matrix();
matrix.postRotate(angle);
// 创建新的图片
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), matrix, true);
return resizedBitmap;
}

public static String getRealFilePath(final Context context, final Uri uri) {
if (null == uri)
return null;
final String scheme = uri.getScheme();
String data = null;
if (scheme == null)
data = uri.getPath();
else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
data = uri.getPath();
} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
Cursor cursor = context.getContentResolver().query(uri,
new String[] { MediaStore.Images.ImageColumns.DATA }, null,
null, null);
if (null != cursor) {
if (cursor.moveToFirst()) {
int index = cursor
.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
if (index > -1) {
data = cursor.getString(index);
}
}
cursor.close();
}
}
return data;
}
}

PhotoInfo

package com.example.simpletakepicture;

import android.graphics.Bitmap;

public class PhotoInfo {
//图片的真实路径
private String photoSDCardPath;
//显示在页面中的缩略图
private Bitmap thumbnail;

public Bitmap getThumbnail() {
return thumbnail;
}

public void setThumbnail(Bitmap thumbnail) {
this.thumbnail = thumbnail;
}

public String getPhotoSDCardPath() {
return photoSDCardPath;
}

public void setPhotoSDCardPath(String photoSDCardPath) {
this.photoSDCardPath = photoSDCardPath;
}
}

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