Android裁剪图像实现方法示例

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.
*
* <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

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