本文实例讲述了Android裁剪图像实现方法。分享给大家供大家参考，具体如下：

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.** 
* This class is used to encode and decode data in Base64 format as described in RFC 1521.** 
* Project home page: www.source-code.biz/base64coder/java* Author: Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland
* 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; iin to be processed.* @param iLen     Number of bytes to be processed in in, starting at iOff.* @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 in.* @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 in to be processed.* @param iLen Number of bytes to process in in, starting at iOff.* @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 paddingint oLen = ((iLen+2)/3)*4;     // output length including paddingchar[] 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 sun.misc.BASE64Decoder.decodeBuffer(String).* @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 in to be processed.* @param iLen Number of characters to process in in, starting at iOff.* @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    
更多关于Android相关内容感兴趣的读者可查看本站专题：《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android多媒体操作技巧汇总(音频,视频,录音等)》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》
  
希望本文所述对大家Android程序设计有所帮助。
                                                                                                    







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