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Android應用開發教程之二十五：自定義圖片剪輯頭像設置

編輯：關於android開發

　　很早就有有看到有朋友在討論QQ頭像的裁剪上傳是怎麼實現的，吼吼，之前小馬也沒做過，好奇之下學習下，發現以前項目中有類型的功能，結合官方文檔裡面的解釋，就更好玩了，急急忙忙寫51裡的，今天聽變3主題曲，重新記錄在WorePress裡，記錄編程的過程，希望能與更多的朋友交流學習，文章中的截圖是動態的，我暈………….貌似WorePress不支持Gif還是怎麼了，今天不動了，jekyll也不支持，啊啊啊啊……想看動態效果看下51：http://mzh3344258.blog.51cto.com/blog/1823534/808837 不看的跳過，如果覺得有用，請記得分享出去，只求能讓更多開發的朋友學習使用，小馬先謝謝了，一樣的，先看下效果圖（效果圖小馬不解釋了，直接流水寫下去，小馬是直接在模擬器裡寫的，能在真機上使用，因為很簡單），再看代碼是怎麼實現的：

　　一：主布局界面

　　二：點擊控件觸發事件後效果圖

Android應用開發教程之二十五：自定義圖片剪輯頭像設置

　　三：拍照完之後效果圖

Android應用開發教程之二十五：自定義圖片剪輯頭像設置

　　四：裁剪界面效果圖

Android應用開發教程之二十五：自定義圖片剪輯頭像設置

　　五：點擊相冊後返回的圖片效果圖

Android應用開發教程之二十五：自定義圖片剪輯頭像設置

　　六：裁剪完從相冊PICK的保存後的效果圖

Android應用開發教程之二十五：自定義圖片剪輯頭像設置

　　下面直接來看下主控制類代碼，如下：

Java代碼

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);
}
}
}

下面來看下裁剪中用到的類，大家詳細看下頭注釋：

Java代碼

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: <a href="http://www.source-code.biz/base64coder/java/">www.source-code.biz/base64coder/java</a><br>
* 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 <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>.
* @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

最後，小DEMO源碼此下載：http://mzh3344258.blog.51cto.com/blog/1823534/808837 （頁面最下方小Demo源碼即是），有需要的朋友可以下載下來，共同交流學習。

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