Android裁剪图像实现方法示例

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);
    }
  }
}

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: www.source-code.biz/base64coder/java
* 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 sun.misc.base64encoder.encodebuffer(byte[]).
* @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