Android裁剪圖像實現方法示例

本文實例講述了Android裁剪圖像實現方法。分享給大家供大家參考，具體如下：

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: 圖片裁剪功能測試
 * @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();
  }
  /**
   * 初始化方法實現
   */
  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);
  }
  /**
   * 控件點擊事件實現
   *
   * 因為有朋友問不同控件的背景圖裁剪怎麼實現，
   * 我就在這個地方用了三個控件，只為了自己記錄學習
   * 大家覺得沒用的可以跳過啦
   */
  @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;
    }
  }
  /**
   * 選擇提示對話框
   */
  private void ShowPickDialog() {
    new AlertDialog.Builder(this)
    .setTitle("設置頭像...")
    .setNegativeButton("相冊", new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int which) {
      dialog.dismiss();
      /**
       * 剛開始，我自己也不知道ACTION_PICK是干嘛的，後來直接看Intent源碼，
       * 可以發現裡面很多東西，Intent是個很強大的東西，大家一定仔細閱讀下
       */
      Intent intent = new Intent(Intent.ACTION_PICK, null);
      /**
       * 下面這句話，與其它方式寫是一樣的效果，如果：
       * intent.setData(MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
       * intent.setType(""image/*");設置數據類型
       * 如果朋友們要限制上傳到服務器的圖片類型時可以直接寫如："image/jpeg 、 image/png等的類型"
       * 這個地方小馬有個疑問，希望高手解答下：就是這個數據URI與類型為什麼要分兩種形式來寫呀？有什麼區別？
       */
      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();
      /**
       * 下面這句還是老樣子，調用快速拍照功能，至於為什麼叫快速拍照，大家可以參考如下官方
       * 文檔，you_sdk_path/docs/guide/topics/media/camera.html
       * 我剛看的時候因為太長就認真看，其實是錯的，這個裡面有用的太多了，所以大家不要認為
       * 官方文檔太長了就不看了，其實是錯的，這個地方小馬也錯了，必須改正
       */
      Intent intent = new Intent(
        MediaStore.ACTION_IMAGE_CAPTURE);
      //下面這句指定調用相機拍照後的照片存儲的路徑
      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) {
    // 如果是直接從相冊獲取
    case 1:
      startPhotoZoom(data.getData());
      break;
    // 如果是調用相機拍照時
    case 2:
      File temp = new File(Environment.getExternalStorageDirectory()
          + "/xiaoma.jpg");
      startPhotoZoom(Uri.fromFile(temp));
      break;
    // 取得裁剪後的圖片
    case 3:
      /**
       * 非空判斷大家一定要驗證，如果不驗證的話，
       * 在剪裁之後如果發現不滿意，要重新裁剪，丟棄
       * 當前功能時，會報NullException，小馬只
       * 在這個地方加下，大家可以根據不同情況在合適的
       * 地方做判斷處理類似情況
       *
       */
      if(data != null){
        setPicToView(data);
      }
      break;
    default:
      break;
    }
    super.onActivityResult(requestCode, resultCode, data);
  }
  /**
   * 裁剪圖片方法實現
   * @param uri
   */
  public void startPhotoZoom(Uri uri) {
    /*
     * 至於下面這個Intent的ACTION是怎麼知道的，大家可以看下自己路徑下的如下網頁
     * yourself_sdk_path/docs/reference/android/content/Intent.html
     * 直接在裡面Ctrl+F搜：CROP ，之前小馬沒仔細看過，其實安卓系統早已經有自帶圖片裁剪功能,
     * 是直接調本地庫的，小馬不懂C C++ 這個不做詳細了解去了，有輪子就用輪子，不再研究輪子是怎麼
     * 制做的了...吼吼
     */
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image/*");
    //下面這個crop=true是設置在開啟的Intent中設置顯示的VIEW可裁剪
    intent.putExtra("crop", "true");
    // aspectX aspectY 是寬高的比例
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    // outputX outputY 是裁剪圖片寬高
    intent.putExtra("outputX", 150);
    intent.putExtra("outputY", 150);
    intent.putExtra("return-data", true);
    startActivityForResult(intent, 3);
  }
  /**
   * 保存裁剪之後的圖片數據
   * @param picdata
   */
  private void setPicToView(Intent picdata) {
    Bundle extras = picdata.getExtras();
    if (extras != null) {
      Bitmap photo = extras.getParcelable("data");
      Drawable drawable = new BitmapDrawable(photo);
      /**
       * 下面注釋的方法是將裁剪之後的圖片以Base64Coder的字符方式上
       * 傳到服務器，QQ頭像上傳采用的方法跟這個類似
       */
      /*ByteArrayOutputStream stream = new ByteArrayOutputStream();
      photo.compress(Bitmap.CompressFormat.JPEG, 60, stream);
      byte[] b = stream.toByteArray();
      // 將圖片流以字符串形式存儲下來
      tp = new String(Base64Coder.encodeLines(b));
      這個地方大家可以寫下給服務器上傳圖片的實現，直接把tp直接上傳就可以了，
      服務器處理的方法是服務器那邊的事了，吼吼
      如果下載到的服務器的數據還是以Base64Coder的形式的話，可以用以下方式轉換
      為我們可以用的圖片類型就OK啦...吼吼
      Bitmap dBitmap = BitmapFactory.decodeFile(tp);
      Drawable drawable = new BitmapDrawable(dBitmap);
      */
      ib.setBackgroundDrawable(drawable);
      iv.setBackgroundDrawable(drawable);
    }
  }
}

下裁剪中用到的類，大家詳細看下頭注釋：

package com.xiaoma.piccut.demo;
/**
 * 下面這些注釋是下載這個類的時候本來就有的，本來要刪除的，但看了下竟然是license，吼吼，
 * 好東西，留在注釋裡，以備不時之用，大家有需要加license的可以到下面的網址找哦
 */
//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.
*/
/**
 * 這個類在上面注釋的網址中有，大家可以自行下載下，也可以直接用這個，
 * 公開的Base64Coder類（不用深究它是怎麼實現的，
 * 還是那句話，有輪子直接用輪子），好用的要死人了...
 * 小馬也很無恥的引用了這個網址下的東東，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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希望本文所述對大家Android程序設計有所幫助。