Android 图片裁剪功能实现详解(类似QQ自定义头像裁剪)


下面直接来看下主控制类代码,如下:

    package com.xiaoma.piccut.demo;  
     
    import java.io.File;  
    import android.app.Activity;  
    import android.app.AlertDialog;  
    import android.content.DialogInterface;  
    import android.content.Intent;  
    import android.graphics.Bitmap;  
    import android.graphics.drawable.BitmapDrawable;  
    import android.graphics.drawable.Drawable;  
    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.Button;  
    import android.widget.ImageButton;  
    import android.widget.ImageView;  
    /**  
     * @Title: PicCutDemoActivity.java  
     * @Package com.xiaoma.piccut.demo  
     * @Description: 图片裁剪功能测试  
     * @author XiaoMa  
     */ 
    public class PicCutDemoActivity extends Activity implements OnClickListener {  
     
        private ImageButton ib = null;  
        private ImageView iv = null;  
        private Button btn = null;  
        private String tp = null;  
          
     
        /** Called when the activity is first created. */ 
        @Override 
        public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main);  
            //初始化  
            init();  
        }  
          
        /**  
         * 初始化方法实现  
         */ 
        private void init() {  
            ib = (ImageButton) findViewById(R.id.imageButton1);  
            iv = (ImageView) findViewById(R.id.imageView1);  
            btn = (Button) findViewById(R.id.button1);  
            ib.setOnClickListener(this);  
            iv.setOnClickListener(this);  
            btn.setOnClickListener(this);  
        }  
     
          
        /**  
         * 控件点击事件实现  
         *   
         * 因为有朋友问不同控件的背景图裁剪怎么实现,  
         * 我就在这个地方用了三个控件,只为了自己记录学习  
         * 大家觉得没用的可以跳过啦  
         */ 
        @Override 
        public void onClick(View v) {  
            switch (v.getId()) {  
            case R.id.imageButton1:  
                ShowPickDialog();  
                break;  
            case R.id.imageView1:  
                ShowPickDialog();  
                break;  
            case R.id.button1:  
                ShowPickDialog();  
                break;  
     
            default:  
                break;  
            }  
        }  
     
        /**  
         * 选择提示对话框  
         */ 
        private void ShowPickDialog() {  
            new AlertDialog.Builder(this)  
                    .setTitle("设置头像...")  
                    .setNegativeButton("相册", new DialogInterface.OnClickListener() {  
                        public void onClick(DialogInterface dialog, int which) {  
                            dialog.dismiss();  
                            /**  
                             * 刚开始,我自己也不知道ACTION_PICK是干嘛的,后来直接看Intent源码,  
                             * 可以发现里面很多东西,Intent是个很强大的东西,大家一定仔细阅读下  
                             */ 
                            Intent intent = new Intent(Intent.ACTION_PICK, null);  
                              
                            /**  
                             * 下面这句话,与其它方式写是一样的效果,如果:  
                             * intent.setData(MediaStore.Images.Media.EXTERNAL_CONTENT_URI);  
                             * intent.setType(""image/*");设置数据类型  
                             * 如果朋友们要限制上传到服务器的图片类型时可以直接写如:"image/jpeg 、 image/png等的类型"  
                             * 这个地方小马有个疑问,希望高手解答下:就是这个数据URI与类型为什么要分两种形式来写呀?有什么区别?  
                             */ 
                            intent.setDataAndType(  
                                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI,  
                                    "image/*");  
                            startActivityForResult(intent, 1);  
     
                        }  
                    })  
                    .setPositiveButton("拍照", new DialogInterface.OnClickListener() {  
                        public void onClick(DialogInterface dialog, int whichButton) {  
                            dialog.dismiss();  
                            /**  
                             * 下面这句还是老样子,调用快速拍照功能,至于为什么叫快速拍照,大家可以参考如下官方  
                             * 文档,you_sdk_path/docs/guide/topics/media/camera.html  
                             * 我刚看的时候因为太长就认真看,其实是错的,这个里面有用的太多了,所以大家不要认为  
                             * 官方文档太长了就不看了,其实是错的,这个地方小马也错了,必须改正  
                             */  
                            Intent intent = new Intent(  
                                    MediaStore.ACTION_IMAGE_CAPTURE);  
                            //下面这句指定调用相机拍照后的照片存储的路径  
                            intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri  
                                    .fromFile(new File(Environment  
                                            .getExternalStorageDirectory(),  
                                            "xiaoma.jpg")));  
                            startActivityForResult(intent, 2);  
                        }  
                    }).show();  
        }  
     
        @Override 
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
            switch (requestCode) {  
            // 如果是直接从相册获取  
            case 1:  
                startPhotoZoom(data.getData());  
                break;  
            // 如果是调用相机拍照时  
            case 2:  
                File temp = new File(Environment.getExternalStorageDirectory()  
                        + "/xiaoma.jpg");  
                startPhotoZoom(Uri.fromFile(temp));  
                break;  
            // 取得裁剪后的图片  
            case 3:  
                /**  
                 * 非空判断大家一定要验证,如果不验证的话,  
                 * 在剪裁之后如果发现不满意,要重新裁剪,丢弃  
                 * 当前功能时,会报NullException,小马只  
                 * 在这个地方加下,大家可以根据不同情况在合适的  
                 * 地方做判断处理类似情况  
                 *   
                 */ 
                if(data != null){  
                    setPicToView(data);  
                }  
                break;  
            default:  
                break;  
     
            }  
            super.onActivityResult(requestCode, resultCode, data);  
        }  
          
        /**  
         * 裁剪图片方法实现  
         * @param uri  
         */ 
        public void startPhotoZoom(Uri uri) {  
            /*  
             * 至于下面这个Intent的ACTION是怎么知道的,大家可以看下自己路径下的如下网页  
             * yourself_sdk_path/docs/reference/android/content/Intent.html  
             * 直接在里面Ctrl+F搜:CROP ,之前小马没仔细看过,其实安卓系统早已经有自带图片裁剪功能,  
             * 是直接调本地库的,小马不懂C C++  这个不做详细了解去了,有轮子就用轮子,不再研究轮子是怎么  
             * 制做的了...吼吼  
             */ 
            Intent intent = new Intent("com.android.camera.action.CROP");  
            intent.setDataAndType(uri, "image/*");  
            //下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪  
            intent.putExtra("crop", "true");  
            // aspectX aspectY 是宽高的比例  
            intent.putExtra("aspectX", 1);  
            intent.putExtra("aspectY", 1);  
            // outputX outputY 是裁剪图片宽高  
            intent.putExtra("outputX", 150);  
            intent.putExtra("outputY", 150);  
            intent.putExtra("return-data", true);  
            startActivityForResult(intent, 3);  
        }  
          
        /**  
         * 保存裁剪之后的图片数据  
         * @param picdata  
         */  
        private void setPicToView(Intent picdata) {  
            Bundle extras = picdata.getExtras();  
            if (extras != null) {  
                Bitmap photo = extras.getParcelable("data");  
                Drawable drawable = new BitmapDrawable(photo);  
                  
                /**  
                 * 下面注释的方法是将裁剪之后的图片以Base64Coder的字符方式上  
                 * 传到服务器,QQ头像上传采用的方法跟这个类似  
                 */ 
                  
                /*ByteArrayOutputStream stream = new ByteArrayOutputStream();  
                photo.compress(Bitmap.CompressFormat.JPEG, 60, stream);  
                byte[] b = stream.toByteArray();  
                // 将图片流以字符串形式存储下来  
                  
                tp = new String(Base64Coder.encodeLines(b));  
                这个地方大家可以写下给服务器上传图片的实现,直接把tp直接上传就可以了,  
                服务器处理的方法是服务器那边的事了,吼吼  
                  
                如果下载到的服务器的数据还是以Base64Coder的形式的话,可以用以下方式转换  
                为我们可以用的图片类型就OK啦...吼吼  
                Bitmap dBitmap = BitmapFactory.decodeFile(tp);  
                Drawable drawable = new BitmapDrawable(dBitmap);  
                */ 
                ib.setBackgroundDrawable(drawable);  
                iv.setBackgroundDrawable(drawable);  
            }  
        }  
     
    } 


下面来看下裁剪中用到的类,大家详细看下头注释:

    package com.xiaoma.piccut.demo;  
     
     
     
     
    /**  
     * 下面这些注释是下载这个类的时候本来就有的,本来要删除的,但看了下竟然是license,吼吼,  
     * 好东西,留在注释里,以备不时之用,大家有需要加license的可以到下面的网址找哦  
     */ 
     
    //EPL, Eclipse Public License, V1.0 or later, http://www.eclipse.org/legal  
    //LGPL, GNU Lesser General Public License, V2.1 or later, http://www.gnu.org/licenses/lgpl.html  
    //GPL, GNU General Public License, V2 or later, http://www.gnu.org/licenses/gpl.html  
    //AL, Apache License, V2.0 or later, http://www.apache.org/licenses  
    //BSD, BSD License, http://www.opensource.org/licenses/bsd-license.php  
    /**  
    * A Base64 encoder/decoder.  
    *  
    * <p>  
    * This class is used to encode and decode data in Base64 format as described in RFC 1521.  
    *  
    * <p>  
    * Project home page: <a href="http://www.source-code.biz/base64coder/java/">www.source-code.biz/base64coder/java</a><br>  
    * Author: Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland<br>  
    * Multi-licensed: EPL / LGPL / GPL / AL / BSD.  
    */ 
     
    /**  
     * 这个类在上面注释的网址中有,大家可以自行下载下,也可以直接用这个,  
     * 公开的Base64Coder类(不用深究它是怎么实现的,  
     * 还是那句话,有轮子直接用轮子),好用的要死人了...  
     * 小马也很无耻的引用了这个网址下的东东,吼吼...  
    * @Title: Base64Coder.java  
    * @Package com.xiaoma.piccut.demo  
    * @Description: TODO  
    * @author XiaoMa  
     */ 
     
    public class Base64Coder {  
     
    //The line separator string of the operating system.  
    private static final String systemLineSeparator = System.getProperty("line.separator");  
     
    //Mapping table from 6-bit nibbles to Base64 characters.  
    private static char[]    map1 = new char[64];  
    static {  
       int i=0;  
       for (char c='A'; c<='Z'; c++) map1[i++] = c;  
       for (char c='a'; c<='z'; c++) map1[i++] = c;  
       for (char c='0'; c<='9'; c++) map1[i++] = c;  
       map1[i++] = '+'; map1[i++] = '/'; }  
     
    //Mapping table from Base64 characters to 6-bit nibbles.  
    private static byte[]    map2 = new byte[128];  
    static {  
       for (int i=0; i<map2.length; i++) map2[i] = -1;  
       for (int i=0; i<64; i++) map2[map1[i]] = (byte)i; }  
     
    /**  
    * Encodes a string into Base64 format.  
    * No blanks or line breaks are inserted.  
    * @param s  A String to be encoded.  
    * @return   A String containing the Base64 encoded data.  
    */ 
    public static String encodeString (String s) {  
    return new String(encode(s.getBytes())); }  
     
    /**  
    * Encodes a byte array into Base 64 format and breaks the output into lines of 76 characters.  
    * This method is compatible with <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>.  
    * @param in  An array containing the data bytes to be encoded.  
    * @return    A String containing the Base64 encoded data, broken into lines.  
    */ 
    public static String encodeLines (byte[] in) {  
    return encodeLines(in, 0, in.length, 76, systemLineSeparator); }  
     
    /**  
    * Encodes a byte array into Base 64 format and breaks the output into lines.  
    * @param in            An array containing the data bytes to be encoded.  
    * @param iOff          Offset of the first byte in <code>in</code> to be processed.  
    * @param iLen          Number of bytes to be processed in <code>in</code>, starting at <code>iOff</code>.  
    * @param lineLen       Line length for the output data. Should be a multiple of 4.  
    * @param lineSeparator The line separator to be used to separate the output lines.  
    * @return              A String containing the Base64 encoded data, broken into lines.  
    */ 
    public static String encodeLines (byte[] in, int iOff, int iLen, int lineLen, String lineSeparator) {  
    int blockLen = (lineLen*3) / 4;  
    if (blockLen <= 0) throw new IllegalArgumentException();  
    int lines = (iLen+blockLen-1) / blockLen;  
    int bufLen = ((iLen+2)/3)*4 + lines*lineSeparator.length();  
    StringBuilder buf = new StringBuilder(bufLen);  
    int ip = 0;  
    while (ip < iLen) {  
       int l = Math.min(iLen-ip, blockLen);  
       buf.append (encode(in, iOff+ip, l));  
       buf.append (lineSeparator);  
       ip += l; }  
    return buf.toString(); }  
     
    /**  
    * Encodes a byte array into Base64 format.  
    * No blanks or line breaks are inserted in the output.  
    * @param in  An array containing the data bytes to be encoded.  
    * @return    A character array containing the Base64 encoded data.  
    */ 
    public static char[] encode (byte[] in) {  
    return encode(in, 0, in.length); }  
     
    /**  
    * Encodes a byte array into Base64 format.  
    * No blanks or line breaks are inserted in the output.  
    * @param in    An array containing the data bytes to be encoded.  
    * @param iLen  Number of bytes to process in <code>in</code>.  
    * @return      A character array containing the Base64 encoded data.  
    */ 
    public static char[] encode (byte[] in, int iLen) {  
    return encode(in, 0, iLen); }  
     
    /**  
    * Encodes a byte array into Base64 format.  
    * No blanks or line breaks are inserted in the output.  
    * @param in    An array containing the data bytes to be encoded.  
    * @param iOff  Offset of the first byte in <code>in</code> to be processed.  
    * @param iLen  Number of bytes to process in <code>in</code>, starting at <code>iOff</code>.  
    * @return      A character array containing the Base64 encoded data.  
    */ 
    public static char[] encode (byte[] in, int iOff, int iLen) {  
    int oDataLen = (iLen*4+2)/3;       // output length without padding  
    int oLen = ((iLen+2)/3)*4;         // output length including padding  
    char[] out = new char[oLen];  
    int ip = iOff;  
    int iEnd = iOff + iLen;  
    int op = 0;  
    while (ip < iEnd) {  
       int i0 = in[ip++] & 0xff;  
       int i1 = ip < iEnd ? in[ip++] & 0xff : 0;  
       int i2 = ip < iEnd ? in[ip++] & 0xff : 0;  
       int o0 = i0 >>> 2;  
       int o1 = ((i0 &   3) << 4) | (i1 >>> 4);  
       int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);  
       int o3 = i2 & 0x3F;  
       out[op++] = map1[o0];  
       out[op++] = map1[o1];  
       out[op] = op < oDataLen ? map1[o2] : '='; op++;  
       out[op] = op < oDataLen ? map1[o3] : '='; op++; }  
    return out; }  
     
    /**  
    * Decodes a string from Base64 format.  
    * No blanks or line breaks are allowed within the Base64 encoded input data.  
    * @param s  A Base64 String to be decoded.  
    * @return   A String containing the decoded data.  
    * @throws   IllegalArgumentException If the input is not valid Base64 encoded data.  
    */ 
    public static String decodeString (String s) {  
    return new String(decode(s)); }  
     
    /**  
    * Decodes a byte array from Base64 format and ignores line separators, tabs and blanks.  
    * CR, LF, Tab and Space characters are ignored in the input data.  
    * This method is compatible with <code>sun.misc.BASE64Decoder.decodeBuffer(String)</code>.  
    * @param s  A Base64 String to be decoded.  
    * @return   An array containing the decoded data bytes.  
    * @throws   IllegalArgumentException If the input is not valid Base64 encoded data.  
    */ 
    public static byte[] decodeLines (String s) {  
    char[] buf = new char[s.length()+3];  
    int p = 0;  
    for (int ip = 0; ip < s.length(); ip++) {  
       char c = s.charAt(ip);  
       if (c != ' ' && c != '\r' && c != '\n' && c != '\t')  
          buf[p++] = c; }  
       while ((p % 4) != 0)  
           buf[p++] = '0';  
          
    return decode(buf, 0, p); }  
     
    /**  
    * Decodes a byte array from Base64 format.  
    * No blanks or line breaks are allowed within the Base64 encoded input data.  
    * @param s  A Base64 String to be decoded.  
    * @return   An array containing the decoded data bytes.  
    * @throws   IllegalArgumentException If the input is not valid Base64 encoded data.  
    */ 
    public static byte[] decode (String s) {  
    return decode(s.toCharArray()); }  
     
    /**  
    * Decodes a byte array from Base64 format.  
    * No blanks or line breaks are allowed within the Base64 encoded input data.  
    * @param in  A character array containing the Base64 encoded data.  
    * @return    An array containing the decoded data bytes.  
    * @throws    IllegalArgumentException If the input is not valid Base64 encoded data.  
    */ 
    public static byte[] decode (char[] in) {  
    return decode(in, 0, in.length); }  
     
    /**  
    * Decodes a byte array from Base64 format.  
    * No blanks or line breaks are allowed within the Base64 encoded input data.  
    * @param in    A character array containing the Base64 encoded data.  
    * @param iOff  Offset of the first character in <code>in</code> to be processed.  
    * @param iLen  Number of characters to process in <code>in</code>, starting at <code>iOff</code>.  
    * @return      An array containing the decoded data bytes.  
    * @throws      IllegalArgumentException If the input is not valid Base64 encoded data.  
    */ 
    public static byte[] decode (char[] in, int iOff, int iLen) {  
    if (iLen%4 != 0) throw new IllegalArgumentException ("Length of Base64 encoded input string is not a multiple of 4.");  
    while (iLen > 0 && in[iOff+iLen-1] == '=') iLen--;  
    int oLen = (iLen*3) / 4;  
    byte[] out = new byte[oLen];  
    int ip = iOff;  
    int iEnd = iOff + iLen;  
    int op = 0;  
    while (ip < iEnd) {  
       int i0 = in[ip++];  
       int i1 = in[ip++];  
       int i2 = ip < iEnd ? in[ip++] : 'A';  
       int i3 = ip < iEnd ? in[ip++] : 'A';  
       if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)  
          throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");  
       int b0 = map2[i0];  
       int b1 = map2[i1];  
       int b2 = map2[i2];  
       int b3 = map2[i3];  
       if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)  
          throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");  
       int o0 = ( b0       <<2) | (b1>>>4);  
       int o1 = ((b1 & 0xf)<<4) | (b2>>>2);  
       int o2 = ((b2 &   3)<<6) |  b3;  
       out[op++] = (byte)o0;  
       if (op<oLen) out[op++] = (byte)o1;  
       if (op<oLen) out[op++] = (byte)o2; }  
    return out; }  
     
    //Dummy constructor.  
    private Base64Coder() {}  
     
    } // end class Base64Coder 


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