Android裁剪映像實現方法樣本_Android

本文執行個體講述了Android裁剪映像實現方法。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);  }  /**   * 控制項點擊事件實現   *   * 因為有朋友問不同控制項的背景圖裁剪怎麼實現，   * 我就在這個地方用了三個控制項，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;    }  }  /**   * 選擇提示對話方塊   */  private void ShowPickDialog() {    new AlertDialog.Builder(this)    .setTitle("設定頭像...")    .setNegativeButton("相簿", new DialogInterface.OnClickListener() {     public void onClick(DialogInterface dialog, int which) {      dialog.dismiss();      /**       * 剛開始，我自己也不知道ACTION_PICK是幹嘛的，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/*");設定資料類型       * 如果朋友們要限制上傳到伺服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：就是這個資料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儲存的路徑      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) {    // 如果是直接從相簿擷取    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內建圖片裁剪功能,     * 是直接調本地庫的，小馬不懂C C++ 這個不做詳細瞭解去了，有輪子就用輪子，不再研究輪子是怎麼     * 製做的了...吼吼     */    Intent intent = new Intent("com.android.camera.action.CROP");    intent.setDataAndType(uri, "image/*");    //下面這個crop=true是設定在開啟的Intent中設定顯示的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);  }  /**   * 儲存裁剪之後的圖片資料   * @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的字元方式上       * 傳到伺服器，QQ頭像上傳採用的方法跟這個類似       */      /*ByteArrayOutputStream stream = new ByteArrayOutputStream();      photo.compress(Bitmap.CompressFormat.JPEG, 60, stream);      byte[] b = stream.toByteArray();      // 將圖片流以字串形式儲存下來      tp = new String(Base64Coder.encodeLines(b));      這個地方大家可以寫下給伺服器上傳圖片的實現，直接把tp直接上傳就可以了，      伺服器處理的方法是伺服器那邊的事了，吼吼      如果下載到的伺服器的資料還是以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 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 <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程式設計有所協助。