之前介绍过一个截图的办法(http://www.cnblogs.com/tianzhijiexian/p/3900241.html),这里再分享个开源项目。它也是截图,但是效果不是很好,首先还是对于小图片没有进行考虑,然后裁剪框也没有正对图片的大小做适配。虽然其代码比较简单,但我还是不推荐用这个做复杂的裁剪。然而里面有个“裁剪框不动,图片可缩放”的效果还是很实用的。因此,我还是来介绍一下。
首先还是导入项目,然后在项目中新建一个类,主要是用来继承Application。便于以后保存到sd卡中
package com.kale.cropimagetest; import android.app.Application; /** * @author:Jack Tony * @tips :在application标签下要有这个内部类的名字 * 如:android:name="com.kale.cropimagetest.DemoApp" * <application android:name="com.kale.cropimagetest.DemoApp" android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > * @date :2014-8-9 */ public class App extends Application { private static App instance; @Override public void onCreate() { super.onCreate(); instance = this; } public static App getInstance() { return instance; } }
写好后,在manifest中的application中写上这个类
android:name="com.kale.cropimagetest.App"
<application android:allowBackup="true" android:name="com.kale.cropimagetest.App" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" >
……
然后在建立一个类,用来保存截图。根据实际需要可以自行修改
package com.kale.cropimagetest; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.RandomAccessFile; import android.graphics.Bitmap; import android.os.Environment; /** * * 与文件相关的类,主要负责文件的读写 * * @author 杨龙辉 2012.04.07 * */ /** * @author:Jack Tony * @tips : 需要有读取sd卡的权限 * @date :2014-8-9 */ public final class FileUtil { // ------------------------------ 手机系统相关 ------------------------------ public static final String NEWLINE = System.getProperty("line.separator");// 系统的换行符 public static final String APPROOT = "UMMoka";// 程序的根目录 public static final String ASSERT_PATH="file:///android_asset";//apk的assert目录 public static final String RES_PATH="file:///android_res";//apk的assert目录 //----------------------------------存放文件的路径后缀------------------------------------ public static final String CACHE_IMAGE_SUFFIX=File.separator + APPROOT+ File.separator + "images" + File.separator; public static final String CACHE_VOICE_SUFFIX=File.separator + APPROOT+ File.separator + "voice" + File.separator; public static final String CACHE_MATERIAL_SUFFIX=File.separator + APPROOT + File.separator + "material" + File.separator; public static final String LOG_SUFFIX=File.separator + APPROOT + File.separator + "Log" + File.separator; // ------------------------------------数据的缓存目录------------------------------------------------------- public static String SDCARD_PAHT ;// SD卡路径 public static String LOCAL_PATH ;// 本地路径,即/data/data/目录下的程序私有目录 public static String CURRENT_PATH = "";// 当前的路径,如果有SD卡的时候当前路径为SD卡,如果没有的话则为程序的私有目录 static { init(); } public static void init() { SDCARD_PAHT = Environment.getExternalStorageDirectory().getPath();// SD卡路径 LOCAL_PATH = App.getInstance().getApplicationContext().getFilesDir().getAbsolutePath();// 本地路径,即/data/data/目录下的程序私有目录 if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) { CURRENT_PATH = SDCARD_PAHT; } else { CURRENT_PATH = LOCAL_PATH; } } /** * 得到与当前存储路径相反的路径(当前为/data/data目录,则返回/sdcard目录;当前为/sdcard,则返回/data/data目录) * @return */ public static String getDiffPath() { if(CURRENT_PATH.equals(SDCARD_PAHT)) { return LOCAL_PATH; } return SDCARD_PAHT; } public static String getDiffPath(String pathIn) { return pathIn.replace(CURRENT_PATH, getDiffPath()); } // ------------------------------------文件的相关方法-------------------------------------------- /** * 将数据写入一个文件 * * @param destFilePath * 要创建的文件的路径 * @param data * 待写入的文件数据 * @param startPos * 起始偏移量 * @param length * 要写入的数据长度 * @return 成功写入文件返回true,失败返回false */ public static boolean writeFile(String destFilePath, byte[] data, int startPos, int length) { try { if (!createFile(destFilePath)) { return false; } FileOutputStream fos = new FileOutputStream(destFilePath); fos.write(data, startPos, length); fos.flush(); if (null != fos) { fos.close(); fos = null; } return true; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return false; } /** * 从一个输入流里写文件 * * @param destFilePath * 要创建的文件的路径 * @param in * 要读取的输入流 * @return 写入成功返回true,写入失败返回false */ public static boolean writeFile(String destFilePath, InputStream in) { try { if (!createFile(destFilePath)) { return false; } FileOutputStream fos = new FileOutputStream(destFilePath); int readCount = 0; int len = 1024; byte[] buffer = new byte[len]; while ((readCount = in.read(buffer)) != -1) { fos.write(buffer, 0, readCount); } fos.flush(); if (null != fos) { fos.close(); fos = null; } if (null != in) { in.close(); in = null; } return true; } catch (IOException e) { e.printStackTrace(); } return false; } public static boolean appendFile(String filename,byte[]data,int datapos,int datalength) { try { createFile(filename); RandomAccessFile rf= new RandomAccessFile(filename, "rw"); rf.seek(rf.length()); rf.write(data, datapos, datalength); if(rf!=null) { rf.close(); } } catch (Exception e) { e.printStackTrace(); } return true; } /** * 读取文件,返回以byte数组形式的数据 * * @param filePath * 要读取的文件路径名 * @return */ public static byte[] readFile(String filePath) { try { if (isFileExist(filePath)) { FileInputStream fi = new FileInputStream(filePath); return readInputStream(fi); } } catch (FileNotFoundException e) { e.printStackTrace(); } return null; } /** * 从一个数量流里读取数据,返回以byte数组形式的数据。 * </br></br> * 需要注意的是,如果这个方法用在从本地文件读取数据时,一般不会遇到问题,但如果是用于网络操作,就经常会遇到一些麻烦(available()方法的问题)。所以如果是网络流不应该使用这个方法。 * @param in * 要读取的输入流 * @return * @throws IOException */ public static byte[] readInputStream(InputStream in) { try { ByteArrayOutputStream os = new ByteArrayOutputStream(); byte[] b = new byte[in.available()]; int length = 0; while ((length = in.read(b)) != -1) { os.write(b, 0, length); } b = os.toByteArray(); in.close(); in = null; os.close(); os = null; return b; } catch (IOException e) { e.printStackTrace(); } return null; } /** * 读取网络流 * @param in * @return */ public static byte[] readNetWorkInputStream(InputStream in) { ByteArrayOutputStream os=null; try { os = new ByteArrayOutputStream(); int readCount = 0; int len = 1024; byte[] buffer = new byte[len]; while ((readCount = in.read(buffer)) != -1) { os.write(buffer, 0, readCount); } in.close(); in = null; return os.toByteArray(); } catch (IOException e) { e.printStackTrace(); }finally{ if(null!=os) { try { os.close(); } catch (IOException e) { e.printStackTrace(); } os = null; } } return null; } /** * 将一个文件拷贝到另外一个地方 * @param sourceFile 源文件地址 * @param destFile 目的地址 * @param shouldOverlay 是否覆盖 * @return */ public static boolean copyFiles(String sourceFile, String destFile,boolean shouldOverlay) { try { if(shouldOverlay) { deleteFile(destFile); } FileInputStream fi = new FileInputStream(sourceFile); writeFile(destFile, fi); return true; } catch (FileNotFoundException e) { e.printStackTrace(); } return false; } /** * 判断文件是否存在 * * @param filePath * 路径名 * @return */ public static boolean isFileExist(String filePath) { File file = new File(filePath); return file.exists(); } /** * 创建一个文件,创建成功返回true * * @param filePath * @return */ public static boolean createFile(String filePath) { try { File file = new File(filePath); if (!file.exists()) { if (!file.getParentFile().exists()) { file.getParentFile().mkdirs(); } return file.createNewFile(); } } catch (IOException e) { e.printStackTrace(); } return true; } /** * 删除一个文件 * * @param filePath * 要删除的文件路径名 * @return true if this file was deleted, false otherwise */ public static boolean deleteFile(String filePath) { try { File file = new File(filePath); if (file.exists()) { return file.delete(); } } catch (Exception e) { e.printStackTrace(); } return false; } /** * 删除 directoryPath目录下的所有文件,包括删除删除文件夹 * @param directoryPath */ public static void deleteDirectory(File dir) { if (dir.isDirectory()) { File[] listFiles = dir.listFiles(); for (int i = 0; i < listFiles.length ; i++) { deleteDirectory(listFiles[i]); } } dir.delete(); } /** * 字符串转流 * @param str * @return */ public static InputStream String2InputStream(String str) { ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes()); return stream; } /** * 流转字符串 * @param is * @return */ public static String inputStream2String(InputStream is) { BufferedReader in = new BufferedReader(new InputStreamReader(is)); StringBuffer buffer = new StringBuffer(); String line = ""; try { while ((line = in.readLine()) != null) { buffer.append(line); } } catch (IOException e) { e.printStackTrace(); } return buffer.toString(); } //批量更改文件后缀 public static void reNameSuffix(File dir,String oldSuffix,String newSuffix) { if (dir.isDirectory()) { File[] listFiles = dir.listFiles(); for (int i = 0; i < listFiles.length ; i++) { reNameSuffix(listFiles[i],oldSuffix,newSuffix); } } else { dir.renameTo(new File(dir.getPath().replace(oldSuffix, newSuffix))); } } public static void writeImage(Bitmap bitmap,String destPath,int quality) { try { FileUtil.deleteFile(destPath); if (FileUtil.createFile(destPath)) { FileOutputStream out = new FileOutputStream(destPath); if (bitmap.compress(Bitmap.CompressFormat.JPEG,quality, out)) { out.flush(); out.close(); out = null; } } } catch (IOException e) { e.printStackTrace(); } } }
这样准备工作就做好了。下面就是项目的使用了~
1.建立布局文件
注意:<com.open.crop.CropImageView ……/>,不同的效果要用不同的控件来实现。如:CropImageView ,CropImageView2,CropImageView3,CropImageView4
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <com.open.crop.CropImageView android:id="@+id/cropImg" android:layout_weight="1.0" android:layout_width="match_parent" android:layout_height="0dp"/> <Button android:id="@+id/save" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="save"/> </LinearLayout>
2.处理裁剪事务。
想用别的控件的话,这里用到的类的名字换一下就行,比如
final CropImageView mCropImage=(CropImageView)findViewById(R.id.cropImg);
final CropImageView2 mCropImage=(CropImageView2)findViewById(R.id.cropImg);
final CropImageView3 mCropImage=(CropImageView3)findViewById(R.id.cropImg);
final CropImageView4 mCropImage=(CropImageView4)findViewById(R.id.cropImg);
package com.kale.cropimagetest; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import com.open.crop.CropImageView; public class CropImageTest01 extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { // TODO 自动生成的方法存根 super.onCreate(savedInstanceState); setContentView(R.layout.test01); final CropImageView mCropImage=(CropImageView)findViewById(R.id.cropImg); //设置要裁剪的图片和默认的裁剪区域 mCropImage.setDrawable(getResources().getDrawable(R.drawable.right),300,300); findViewById(R.id.save).setOnClickListener(new OnClickListener() { /* (非 Javadoc) * @see android.view.View.OnClickListener#onClick(android.view.View) * 开启一个新线程来保存图片 */ @Override public void onClick(View v) { new Thread(new Runnable(){ @Override public void run() { //得到裁剪好的图片 Bitmap bitmap = mCropImage.getCropImage(); FileUtil.writeImage(bitmap, FileUtil.SDCARD_PAHT+"/crop.png", 100); Intent mIntent=new Intent(); mIntent.putExtra("cropImagePath", FileUtil.SDCARD_PAHT+"/crop.png"); setResult(RESULT_OK, mIntent); finish(); } }).start(); } }); } }
最后在主Activity中接收图片的路径,载入显示截图即可。
package com.kale.cropimagetest; import android.app.Activity; import android.content.Intent; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.view.View; import android.widget.ImageView; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void buttonListener(View v) { Intent intent = new Intent(); Class<?> cls = null; switch (v.getId()) { case R.id.crop01_button: cls = CropImageTest01.class; break; case R.id.crop02_button: cls = CropImageTest02.class; break; case R.id.crop03_button: cls = CropImageTest03.class; break; case R.id.crop04_button: cls = CropImageTest04.class; break; default: break; } intent.setClass(getApplicationContext(), cls); startActivityForResult(intent, 100); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { ImageView iv = (ImageView) findViewById(R.id.imageView); if (requestCode == 100 && resultCode == RESULT_OK) { String path = data.getStringExtra("cropImagePath"); iv.setImageDrawable(BitmapDrawable.createFromPath(path)); } super.onActivityResult(requestCode, resultCode, data); } }