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;

public class PicCutDemoActivity extends Activity implements OnClickListener {
  private ImageButton ib = null;
  private ImageView iv = null;
  private Button btn = null;
  private String tp = null;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //初始化
    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("设置头像...")
    .setNegativeButton("相册", new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int which) {
      dialog.dismiss();
      
      Intent intent = new Intent(Intent.ACTION_PICK, null);
      
      intent.setDataAndType(
        MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
        "image
      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:
      
      if(data != null){
        setPicToView(data);
      }
      break;
    default:
      break;
    }
    super.onActivityResult(requestCode, resultCode, data);
  }
  
  public void startPhotoZoom(Uri uri) {
    
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image
  private void setPicToView(Intent picdata) {
    Bundle extras = picdata.getExtras();
    if (extras != null) {
      Bitmap photo = extras.getParcelable("data");
      Drawable drawable = new BitmapDrawable(photo);
      
      
      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;

//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


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; }

public static String encodeString (String s) {
return new String(encode(s.getBytes())); }

public static String encodeLines (byte[] in) {
return encodeLines(in, 0, in.length, 76, systemLineSeparator); }

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(); }

public static char[] encode (byte[] in) {
return encode(in, 0, in.length); }

public static char[] encode (byte[] in, int iLen) {
return encode(in, 0, iLen); }

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; }

public static String decodeString (String s) {
return new String(decode(s)); }

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); }

public static byte[] decode (String s) {
return decode(s.toCharArray()); }

public static byte[] decode (char[] in) {
return decode(in, 0, in.length); }

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

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android多媒体操作技巧汇总(音频,视频,录音等)》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。

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