主程序

package com.test.myphotoshop;

import android.support.v7.app.ActionBarActivity;

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

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.audiofx.EnvironmentalReverb;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements OnClickListener{
    public static final int TAKE_PHOTO=1;
    public static final int CROP_PHOTO=2;
    private Button mButtonTakePhoto;
    private Button mChooseFromAlbum;
    private ImageView mPicture;
    private Uri imageUri;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButtonTakePhoto=(Button) findViewById(R.id.button_take_photo);
        mChooseFromAlbum=(Button) findViewById(R.id.button_choose_photo);
        mChooseFromAlbum.setOnClickListener(this);
        mPicture=(ImageView) findViewById(R.id.picture);
        mButtonTakePhoto.setOnClickListener(this);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
        case TAKE_PHOTO:
            if(resultCode==RESULT_OK){
                Intent intent =new Intent("com.android.camera.action.CROP");
                intent.setDataAndType(imageUri, "image/*");
                intent.putExtra("scale", true);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, CROP_PHOTO);
            }

            break;
        case CROP_PHOTO:
            if(resultCode==RESULT_OK){
                try {
                    Bitmap bitmap=BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                    mPicture.setImageBitmap(bitmap);
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        default:
            break;
        }
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button_take_photo:
            File outputImage=new File(Environment.getExternalStorageDirectory(),"tempImage.jpg");
            try {

                if(outputImage.exists()){
                    outputImage.delete();
                }
                outputImage.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
            imageUri=Uri.fromFile(outputImage);
            Intent intent =new Intent("android.media.action.IMAGE_CAPTURE");
            intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
            //啓動相機程序
            startActivityForResult(intent, TAKE_PHOTO);
            break;
        case R.id.button_choose_photo:
            File outputImage2 =new File(Environment.getExternalStorageDirectory(),"output_image.jpg");

            try {
                if(outputImage2.exists()){
                    outputImage2.delete();
                }
                outputImage2.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
            imageUri=Uri.fromFile(outputImage2);
            Intent intent2=new Intent("android.intent.action.GET_CONTENT");
            intent2.setType("image/*");
            intent2.putExtra("crop", true);
            intent2.putExtra("scale", true);
            intent2.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            startActivityForResult(intent2, CROP_PHOTO);
            break;
        default:
            break;
        }
    }

}

佈局文件

<LinearLayout 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:orientation="vertical">

    <Button
        android:id="@+id/button_take_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Take Photo" />
    <Button
        android:id="@+id/button_choose_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Choose From Album" />
    <ImageView 
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"/>

</LinearLayout>

權限

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

圖片壓縮代碼

主要是第一個方法，其他兩個方法不用管，下面兩個圖片壓縮方法是google提供的，想要壓縮圖片是隻要把圖片的路徑傳入即可。

//這個方法是自己寫的，直接傳入想壓縮的圖片的路徑，然後把圖片壓縮後，直接保存。
private void zipImage(String savePath) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(savePath, options);
        //設置圖片的格式
        options.inSampleSize = computeInitialSampleSize(options, 480, 480 * 960);
        options.inJustDecodeBounds = false;
        Bitmap bitmap = BitmapFactory.decodeFile(savePath, options);
        try {
            FileOutputStream fos = new FileOutputStream(savePath);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        bitmap.recycle();
        bitmap = null;
        System.gc();
    }
    public int computeSampleSize(BitmapFactory.Options options,
                                 int minSideLength, int maxNumOfPixels) {
        int initialSize = computeInitialSampleSize(options, minSideLength,
                maxNumOfPixels);
        int roundedSize;
        if (initialSize <= 8) {
            roundedSize = 1;
            while (roundedSize < initialSize) {
                roundedSize <<= 1;
            }
        } else {
            roundedSize = (initialSize + 7) / 8 * 8;
        }
        return roundedSize;
    }

    private int computeInitialSampleSize(BitmapFactory.Options options,
                                         int minSideLength, int maxNumOfPixels) {
        double w = options.outWidth;
        double h = options.outHeight;
        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math
                .sqrt(w * h / maxNumOfPixels));
        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(
                Math.floor(w / minSideLength), Math.floor(h / minSideLength));
        if (upperBound < lowerBound) {
            // return the larger one when there is no overlapping zone.
            return lowerBound;
        }
        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;
        } else if (minSideLength == -1) {
            return lowerBound;
        } else {
            return upperBound;
        }
    }

最終版本

主程序

package com.test.myphotoshop;

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

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.audiofx.EnvironmentalReverb;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements OnClickListener {
    public static final int TAKE_PHOTO = 1;
    public static final int CROP_PHOTO = 2;
    public static final int TEACHER_PHOTO = 3;
    public static final int CHOOSE_PHOTO=4;
    private Button mButtonTakePhoto;
    private Button mChooseFromAlbum;
    private Button mTeacherPhoto;
    private ImageView mPicture;
    private File newfile;
    private Uri imageUri;
    private Uri dataPhoto;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButtonTakePhoto = (Button) findViewById(R.id.button_take_photo);
        mChooseFromAlbum = (Button) findViewById(R.id.button_choose_photo);
        mChooseFromAlbum.setOnClickListener(this);
        mPicture = (ImageView) findViewById(R.id.picture);
        mButtonTakePhoto.setOnClickListener(this);
        mTeacherPhoto = (Button) findViewById(R.id.button_Teacher_photo);
        mTeacherPhoto.setOnClickListener(this);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
        case TAKE_PHOTO:
            if (resultCode == RESULT_OK) {
                Intent intent = new Intent("com.android.camera.action.CROP");
                intent.setDataAndType(imageUri, "image/*");
                intent.putExtra("scale", true);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, CROP_PHOTO);
            }
            break;
        case CROP_PHOTO:
            if (resultCode == RESULT_OK) {
                try {
                    Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                    mPicture.setImageBitmap(bitmap);
                } catch (FileNotFoundException e) {

                    e.printStackTrace();
                }
            }
        case TEACHER_PHOTO:
            if (resultCode == 8) {
            ImageZip.zipImage(newfile.getAbsolutePath());
            mPicture.setImageURI(Uri.fromFile(newfile));
            }
            break;
        case CHOOSE_PHOTO:
            if (resultCode == RESULT_OK) {
             dataPhoto=data.getData();
            String[] proj={MediaStore.Images.Media.DATA};
            Cursor actualimagecursor=managedQuery(dataPhoto, proj, null, null, null);
            int actual_image_column_index=actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            actualimagecursor.moveToFirst();
            String img_path=actualimagecursor.getString(actual_image_column_index);
            File file =new File(img_path);
            ImageZip.zipImage(file.getAbsolutePath());
            mPicture.setImageURI(Uri.fromFile(file));
            }
            break;
        default:
            break;
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button_take_photo:
            File outputImage = new File(Environment.getExternalStorageDirectory(), "tempImage.jpg");
            try {

                if (outputImage.exists()) {
                    outputImage.delete();
                }
                outputImage.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
            imageUri = Uri.fromFile(outputImage);
            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
            intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            // 啓動相機程序
            startActivityForResult(intent, TAKE_PHOTO);
            break;
        case R.id.button_choose_photo:
            Intent intent2 = new Intent("android.intent.action.GET_CONTENT");
            intent2.setType("image/*");
            startActivityForResult(intent2, CHOOSE_PHOTO);
            break;
        case R.id.button_Teacher_photo:
            Intent intent3 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            newfile = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg");
            if (!newfile.exists()) {
                try {
                    newfile.createNewFile();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            setResult(8);
            intent3.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(newfile));
            startActivityForResult(intent3, TEACHER_PHOTO);
            break;
        default:
            break;
        }
    }

}

壓縮圖片的程序

package com.test.myphotoshop;

import java.io.FileOutputStream;
import java.io.IOException;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class ImageZip {
    public static void zipImage(String savePath) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(savePath, options);
        options.inSampleSize = computeInitialSampleSize(options, 480, 480 * 960);
        options.inJustDecodeBounds = false;
        Bitmap bitmap = BitmapFactory.decodeFile(savePath, options);
        try {
            FileOutputStream fos = new FileOutputStream(savePath);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        bitmap.recycle();
        bitmap = null;
        System.gc();
    }
    public static int computeSampleSize(BitmapFactory.Options options,
                                 int minSideLength, int maxNumOfPixels) {
        int initialSize = computeInitialSampleSize(options, minSideLength,
                maxNumOfPixels);
        int roundedSize;
        if (initialSize <= 8) {
            roundedSize = 1;
            while (roundedSize < initialSize) {
                roundedSize <<= 1;
            }
        } else {
            roundedSize = (initialSize + 7) / 8 * 8;
        }
        return roundedSize;
    }

    public static int computeInitialSampleSize(BitmapFactory.Options options,
                                         int minSideLength, int maxNumOfPixels) {
        double w = options.outWidth;
        double h = options.outHeight;
        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math
                .sqrt(w * h / maxNumOfPixels));
        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(
                Math.floor(w / minSideLength), Math.floor(h / minSideLength));
        if (upperBound < lowerBound) {
            // return the larger one when there is no overlapping zone.
            return lowerBound;
        }
        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;
        } else if (minSideLength == -1) {
            return lowerBound;
        } else {
            return upperBound;
        }
    }
}

佈局文件

<LinearLayout 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:orientation="vertical" >

    <Button
        android:id="@+id/button_take_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Take Photo" />

    <Button
        android:id="@+id/button_choose_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Choose From Album" />

    <Button
        android:id="@+id/button_Teacher_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Teacher Photo" />

    <ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" />

</LinearLayout>

調用攝像頭和相冊，從相冊中選擇(含有google發佈的圖片壓縮以及自己的圖片截取)

主程序

佈局文件

權限

圖片壓縮代碼

主要是第一個方法，其他兩個方法不用管，下面兩個圖片壓縮方法是google提供的，想要壓縮圖片是隻要把圖片的路徑傳入即可。

最終版本

主程序

壓縮圖片的程序

佈局文件

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調用攝像頭和相冊，從相冊中選擇(含有google發佈的圖片壓縮以及自己的圖片截取)

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