Androidトリミング画像の実現方法の例


この例は、Android裁断画像の実現方法を説明する。皆さんに参考にしてあげます。具体的には以下の通りです。

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:         
 * @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);
    //   
    init();
  }
  /**
   *        
   */
  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);
  }
  /**
   *         
   *
   *                     ,
   *              ,         
   *             
   */
  @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;
    }
  }
  /**
   *        
   */
  private void ShowPickDialog() {
    new AlertDialog.Builder(this)
    .setTitle("    ...")
    .setNegativeButton("  ", new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int which) {
      dialog.dismiss();
      /**
       *    ,       ACTION_PICK    ,     Intent  ,
       *           ,Intent        ,         
       */
      Intent intent = new Intent(Intent.ACTION_PICK, null);
      /**
       *      ,            ,  :
       * intent.setData(MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
       * intent.setType(""image/*");      
       *                           :"image/jpeg 、 image/png    "
       *           ,       :      URI               ?     ?
       */
      intent.setDataAndType(
        MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
        "image/*");
      startActivityForResult(intent, 1);
     }
    })
    .setPositiveButton("  ", new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int whichButton) {
      dialog.dismiss();
      /**
       *          ,        ,          ,          
       *   ,you_sdk_path/docs/guide/topics/media/camera.html
       *               ,     ,          ,        
       *            ,     ,         ,    
       */
      Intent intent = new Intent(
        MediaStore.ACTION_IMAGE_CAPTURE);
      //                     
      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) {
    //           
    case 1:
      startPhotoZoom(data.getData());
      break;
    //           
    case 2:
      File temp = new File(Environment.getExternalStorageDirectory()
          + "/xiaoma.jpg");
      startPhotoZoom(Uri.fromFile(temp));
      break;
    //         
    case 3:
      /**
       *            ,       ,
       *             ,     ,  
       *      ,  NullException,   
       *        ,              
       *            
       *
       */
      if(data != null){
        setPicToView(data);
      }
      break;
    default:
      break;
    }
    super.onActivityResult(requestCode, resultCode, data);
  }
  /**
   *         
   * @param uri
   */
  public void startPhotoZoom(Uri uri) {
    /*
     *       Intent ACTION      ,                
     * yourself_sdk_path/docs/reference/android/content/Intent.html
     *      Ctrl+F :CROP ,         ,                  ,
     *         ,    C C++           ,       ,         
     *     ...  
     */
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image/*");
    //    crop=true       Intent      VIEW   
    intent.putExtra("crop", "true");
    // aspectX aspectY       
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    // outputX outputY        
    intent.putExtra("outputX", 150);
    intent.putExtra("outputY", 150);
    intent.putExtra("return-data", true);
    startActivityForResult(intent, 3);
  }
  /**
   *            
   * @param picdata
   */
  private void setPicToView(Intent picdata) {
    Bundle extras = picdata.getExtras();
    if (extras != null) {
      Bitmap photo = extras.getParcelable("data");
      Drawable drawable = new BitmapDrawable(photo);
      /**
       *                  Base64Coder      
       *      ,QQ              
       */
      /*ByteArrayOutputStream stream = new ByteArrayOutputStream();
      photo.compress(Bitmap.CompressFormat.JPEG, 60, stream);
      byte[] b = stream.toByteArray();
      //               
      tp = new String(Base64Coder.encodeLines(b));
                           ,   tp        ,
                       ,  
                     Base64Coder     ,         
                  OK ...  
      Bitmap dBitmap = BitmapFactory.decodeFile(tp);
      Drawable drawable = new BitmapDrawable(dBitmap);
      */
      ib.setBackgroundDrawable(drawable);
      iv.setBackgroundDrawable(drawable);
    }
  }
}

裁断に使うクラスは、頭のコメントをよく見てください。

package com.xiaoma.piccut.demo;
/**
 *                     ,      ,       license,  ,
 *    ,     ,      ,      license           
 */
//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.
*/
/**
 *              ,         ,        ,
 *    Base64Coder (           ,
 *      ,        ),       ...
 *                   ,  ...
* @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 != '
' && 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
Android関連の内容についてもっと興味がある読者は、当駅のテーマを調べてもいいです。「Androidパターンと画像処理技術のまとめ」、「Android開発入門と上級教程」、「Androidデバッグ技術とよくある問題解決方法のまとめ」、「Androidマルチメディア操作技術まとめ(オーディオ、ビデオ、録音など)」、「Android基本コンポーネントの使い方のまとめ」、「AndroidビューViewテクニックのまとめ」、「Androidレイアウトlayout技巧まとめ」および「Androidコントロールの使い方のまとめ
ここで述べたように、皆さんのAndroidプログラムの設計に役に立ちます。