android 拍照保存/压缩显示及从相册选取照片

该代码为转载的，出处，下面有。

主界面代码

package com.ryantang.picture;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
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.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;

public class MainActivity extends Activity {
    
    private static final int TAKE_PICTURE = 0;
    private static final int CHOOSE_PICTURE = 1;
    
    private static final int SCALE = 5;//照片缩小比例
    private ImageView iv_image = null;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("Demo作者：@唐韧_Ryan");
        
        iv_image = (ImageView) this.findViewById(R.id.img);
        
        this.findViewById(R.id.btn).setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                showPicturePicker(MainActivity.this);
            }
        });
        
        this.findViewById(R.id.btn2).setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            switch (requestCode) {
            case TAKE_PICTURE:
                //将保存在本地的图片取出并缩小后显示在界面上
                Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+"/image.jpg");
                Bitmap newBitmap = ImageTools.zoomBitmap(bitmap, bitmap.getWidth() / SCALE, bitmap.getHeight() / SCALE);
                //由于Bitmap内存占用较大，这里需要回收内存，否则会报out of memory异常
                bitmap.recycle();
                
                //将处理过的图片显示在界面上，并保存到本地
//                iv_image.setImageBitmap(newBitmap);
                String dir = Environment.getExternalStorageDirectory()
                        .getAbsolutePath();
                String filename = String.valueOf(System.currentTimeMillis());
                ImageTools.savePhotoToSDCard(newBitmap, dir, filename);
                String path = dir + "/"+filename + ".png";
                Bitmap bitmap1 = BitmapFactory.decodeFile(path);
                iv_image.setImageBitmap(bitmap1);
                break;

            case CHOOSE_PICTURE:
                ContentResolver resolver = getContentResolver();
                //照片的原始资源地址
                Uri originalUri = data.getData(); 
                try {
                    //使用ContentProvider通过URI获取原始图片
                    Bitmap photo = MediaStore.Images.Media.getBitmap(resolver, 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 smallBitmap = 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();
                        
                        iv_image.setImageBitmap(smallBitmap);
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }  
                break;
            
            default:
                break;
            }
        }
    }
    
    public void showPicturePicker(Context context){
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle("图片来源");
        builder.setNegativeButton("取消", null);
        builder.setItems(new String[]{"拍照","相册"}, new DialogInterface.OnClickListener() {
            
            @Override
            public void onClick(DialogInterface dialog, int which) {
                switch (which) {
                case TAKE_PICTURE:
                    Intent openCameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    Uri imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"image.jpg"));
                    //指定照片保存路径（SD卡），image.jpg为一个临时文件，每次拍照后这个图片都会被替换
                    openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                    startActivityForResult(openCameraIntent, TAKE_PICTURE);
                    break;
                    
                case CHOOSE_PICTURE:
                    Intent openAlbumIntent = new Intent(Intent.ACTION_GET_CONTENT);
                    openAlbumIntent.setType("image/*");
                    startActivityForResult(openAlbumIntent, CHOOSE_PICTURE);
                    break;

                default:
                    break;
                }
            }
        });
        builder.create().show();
    }
}

主界面布局文件

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

    <LinearLayout
        android:id="@+id/btn_layout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btn"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Choose picture" />

        <Button
            android:visibility="gone"
            android:id="@+id/btn2"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Crop picture" />
    </LinearLayout>

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn_layout" />

</RelativeLayout>

工具类代码

package com.ryantang.picture;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

/**
 * Tools for handler picture
 * 
 * @author Ryan.Tang
 * 
 */
public final class ImageTools {

    /**
     * Transfer drawable to bitmap
     * 
     * @param drawable
     * @return
     */
    public static Bitmap drawableToBitmap(Drawable drawable) {
        int w = drawable.getIntrinsicWidth();
        int h = drawable.getIntrinsicHeight();

        Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                : Bitmap.Config.RGB_565;
        Bitmap bitmap = Bitmap.createBitmap(w, h, config);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, w, h);
        drawable.draw(canvas);
        return bitmap;
    }

    /**
     * Bitmap to drawable
     * 
     * @param bitmap
     * @return
     */
    public static Drawable bitmapToDrawable(Bitmap bitmap) {
        return new BitmapDrawable(bitmap);
    }

    /**
     * Input stream to bitmap
     * 
     * @param inputStream
     * @return
     * @throws Exception
     */
    public static Bitmap inputStreamToBitmap(InputStream inputStream)
            throws Exception {
        return BitmapFactory.decodeStream(inputStream);
    }

    /**
     * Byte transfer to bitmap
     * 
     * @param byteArray
     * @return
     */
    public static Bitmap byteToBitmap(byte[] byteArray) {
        if (byteArray.length != 0) {
            return BitmapFactory
                    .decodeByteArray(byteArray, 0, byteArray.length);
        } else {
            return null;
        }
    }

    /**
     * Byte transfer to drawable
     * 
     * @param byteArray
     * @return
     */
    public static Drawable byteToDrawable(byte[] byteArray) {
        ByteArrayInputStream ins = null;
        if (byteArray != null) {
            ins = new ByteArrayInputStream(byteArray);
        }
        return Drawable.createFromStream(ins, null);
    }

    /**
     * Bitmap transfer to bytes
     * 
     * @param byteArray
     * @return
     */
    public static byte[] bitmapToBytes(Bitmap bm) {
        byte[] bytes = null;
        if (bm != null) {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
            bytes = baos.toByteArray();
        }
        return bytes;
    }

    /**
     * Drawable transfer to bytes
     * 
     * @param drawable
     * @return
     */
    public static byte[] drawableToBytes(Drawable drawable) {
        BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
        Bitmap bitmap = bitmapDrawable.getBitmap();
        byte[] bytes = bitmapToBytes(bitmap);
        ;
        return bytes;
    }

    /**
     * Base64 to byte[]
//     */
//    public static byte[] base64ToBytes(String base64) throws IOException {
//        byte[] bytes = Base64.decode(base64);
//        return bytes;
//    }
//
//    /**
//     * Byte[] to base64
//     */
//    public static String bytesTobase64(byte[] bytes) {
//        String base64 = Base64.encode(bytes);
//        return base64;
//    }

    /**
     * Create reflection images
     * 
     * @param bitmap
     * @return
     */
    public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
        final int reflectionGap = 4;
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        Matrix matrix = new Matrix();
        matrix.preScale(1, -1);

        Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, h / 2, w,
                h / 2, matrix, false);

        Bitmap bitmapWithReflection = Bitmap.createBitmap(w, (h + h / 2),
                Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmapWithReflection);
        canvas.drawBitmap(bitmap, 0, 0, null);
        Paint deafalutPaint = new Paint();
        canvas.drawRect(0, h, w, h + reflectionGap, deafalutPaint);

        canvas.drawBitmap(reflectionImage, 0, h + reflectionGap, null);

        Paint paint = new Paint();
        LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
                bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,
                0x00ffffff, TileMode.CLAMP);
        paint.setShader(shader);
        // Set the Transfer mode to be porter duff and destination in
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
        // Draw a rectangle using the paint with our linear gradient
        canvas.drawRect(0, h, w, bitmapWithReflection.getHeight()
                + reflectionGap, paint);

        return bitmapWithReflection;
    }

    /**
     * Get rounded corner images
     * 
     * @param bitmap
     * @param roundPx
     *            5 10
     * @return
     */
    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, w, h);
        final RectF rectF = new RectF(rect);
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;
    }

    /**
     * Resize the bitmap
     * 
     * @param bitmap
     * @param width
     * @param height
     * @return
     */
    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;
    }

    /**
     * Resize the drawable
     * @param drawable
     * @param w
     * @param h
     * @return
     */
    public static Drawable zoomDrawable(Drawable drawable, int w, int h) {
        int width = drawable.getIntrinsicWidth();
        int height = drawable.getIntrinsicHeight();
        Bitmap oldbmp = drawableToBitmap(drawable);
        Matrix matrix = new Matrix();
        float sx = ((float) w / width);
        float sy = ((float) h / height);
        matrix.postScale(sx, sy);
        Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,
                matrix, true);
        return new BitmapDrawable(newbmp);
    }
    
    /**
     * Get images from SD card by path and the name of image
     * @param photoName
     * @return
     */
    public static Bitmap getPhotoFromSDCard(String path,String photoName){
        Bitmap photoBitmap = BitmapFactory.decodeFile(path + "/" +photoName +".png");
        if (photoBitmap == null) {
            return null;
        }else {
            return photoBitmap;
        }
    }
    
    /**
     * Check the SD card 
     * @return
     */
    public static boolean checkSDCardAvailable(){
        return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
    }
    
    /**
     * Get image from SD card by path and the name of image
     * @param fileName
     * @return
     */
    public static boolean findPhotoFromSDCard(String path,String photoName){
        boolean flag = false;
        
        if (checkSDCardAvailable()) {
            File dir = new File(path);
            if (dir.exists()) {
                File folders = new File(path);
                File photoFile[] = folders.listFiles();
                for (int i = 0; i < photoFile.length; i++) {
                    String fileName = photoFile[i].getName().split("\\.")[0];
                    if (fileName.equals(photoName)) {
                        flag = true;
                    }
                }
            }else {
                flag = false;
            }
//            File file = new File(path + "/" + photoName  + ".jpg" );
//            if (file.exists()) {
//                flag = true;
//            }else {
//                flag = false;
//            }
            
        }else {
            flag = false;
        }
        return flag;
    }
    
    /**
     * Save image to the SD card 
     * @param photoBitmap
     * @param photoName
     * @param path
     */
    public static void savePhotoToSDCard(Bitmap photoBitmap,String path,String photoName){
        if (checkSDCardAvailable()) {
            File dir = new File(path);
            if (!dir.exists()){
                dir.mkdirs();
            }
            
            File photoFile = new File(path , photoName + ".png");
            FileOutputStream fileOutputStream = null;
            try {
                fileOutputStream = new FileOutputStream(photoFile);
                if (photoBitmap != null) {
                    if (photoBitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream)) {
                        fileOutputStream.flush();
//                        fileOutputStream.close();
                    }
                }
            } catch (FileNotFoundException e) {
                photoFile.delete();
                e.printStackTrace();
            } catch (IOException e) {
                photoFile.delete();
                e.printStackTrace();
            } finally{
                try {
                    fileOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        } 
    }
    
    /**
     * Delete the image from SD card
     * @param context
     * @param path
     * file:///sdcard/temp.jpg
     */
    public static void deleteAllPhoto(String path){
        if (checkSDCardAvailable()) {
            File folder = new File(path);
            File[] files = folder.listFiles();
            for (int i = 0; i < files.length; i++) {
                files[i].delete();
            }
        }
    }
    
    public static void deletePhotoAtPathAndName(String path,String fileName){
        if (checkSDCardAvailable()) {
            File folder = new File(path);
            File[] files = folder.listFiles();
            for (int i = 0; i < files.length; i++) {
                if (files[i].getName().split("\\.")[0].equals(fileName)) {
                    files[i].delete();
                }
            }
        }
    }

}

mainfest.xml 代码如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ryantang.picture"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.ryantang.picture.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>