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在Android中实现图片的裁剪
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本实例的功能是将用户选择的图片裁剪后放入ImagView，布局文件是个Button和ImageView。为了图片的正常显示，我们在裁剪后先将裁剪好的图片先存放到SD卡中，这样就能在以后开启应用的时候直接调用了。
main_activity.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" > <Button
android:id="@+id/image_tailer_button_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="裁剪图片" /> <ImageView
android:id="@+id/user_imageView_id"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_above="@+id/image_tailer_button_id"
android:layout_centerHorizontal="true"
android:layout_marginBottom="100dp"
android:src="@drawable/ic_launcher" /> </RelativeLayout>
MainActivity.java
package com.kale.imagetailor; import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast; public class MainActivity extends Activity { private String tag = getClass().getSimpleName();
private static Uri imageUri; Button imageTailorBt;
ImageView userIV;
File file;
FileManager fm; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewInit();
fm = new FileManager();
try {
file = fm.creatSDFile("Kale Image", "userImage.jpg");
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
} /**
*每次开启时判断设置什么图片，如果有自定义的图片了，那么就用用户自己的头像
*/
private void setUserImage(){
userIV.setImageResource(R.drawable.ic_launcher);
//从sd卡中得到图片资源
String filepath = fm.getFileWholePath();
Bitmap bm = BitmapFactory.decodeFile(filepath); if(bm != null){
//BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。
userIV.setImageDrawable(new BitmapDrawable(bm));
}
else{
userIV.setImageResource(R.drawable.ic_launcher);
}
} private void viewInit(){
userIV = (ImageView)findViewById(R.id.user_imageView_id);
imageTailorBt = (Button)findViewById(R.id.image_tailer_button_id);
imageTailorBt.setOnClickListener(new OnClickListener() { @Override
public void onClick(View arg0) {
// TODO 自动生成的方法存根
changeUserImage();
}
});
} /**
*改变用户头像的方法，这里设定一个intent交给activity去处理
*/
protected void changeUserImage(){
Toast.makeText(getApplicationContext(), "更换头像", 0).show();
imageUri = Uri.parse("file:///sdcard/temp.jpg"); Intent intent = null;
intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");// 设置属性，表示获取任意类型的图片
intent.putExtra("crop", "true");// 设置可以滑动选选择区域的属性,注意这里是字符串"true"
intent.putExtra("aspectX", 1);// 设置剪切框1:1比例的效果
intent.putExtra("aspectY", 1);// 设置剪切框1:1比例的效果
intent.putExtra("outputX", 600);
intent.putExtra("outputY", 600);
intent.putExtra("scale", true);
intent.putExtra("return-data", false);
intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", false); // no face detection
startActivityForResult(intent, 1);
} /**
* @param uri
* @return 一个bitmap对象，用来设置图片
*/
private Bitmap decodeUriAsBitmap(Uri uri){
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
return bitmap;
} /**
* 用来设置图片，并保持的本地
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//不正确的情况下
if(resultCode != Activity.RESULT_OK){
Log.e(tag, "requestCode = " + requestCode);
Log.e(tag, "resultCode = " + resultCode);
Log.e(tag, "data = " + data);
return;
}
else{
Log.d(tag, "CHOOSE_A_BIG_PICTURE: data = " + data);
if(imageUri != null){
Bitmap photo = decodeUriAsBitmap(imageUri);
try {
//保存到本地文件
File pictureFile = file;
FileOutputStream fos = new FileOutputStream(pictureFile);
photo.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
Toast.makeText(this, "设置成功~", 0).show(); } catch (FileNotFoundException e) {
e.printStackTrace();
Toast.makeText(this, "保存路径不存在", 0).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(this, "设置图片失败", 0).show();
}
}
}
setUserImage();
}
}
里面用到的将图片存放到SD卡中的类
FileManager.java
package com.kale.imagetailor; import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream; import android.os.Environment; /**
* @tips :
* <!-- 读写SD卡的权限 -->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
* @date :2014-6-30
*/
public class FileManager {
private String SD_PATH;
private String fileName;
private String dirName; public String getSD_PATH() {
return SD_PATH;
}
public FileManager() {
//得到当前外部存储设备的目录
SD_PATH = Environment.getExternalStorageDirectory() + "/";
}
/**
* 在SD卡上创建文件
*
* @throws IOException
*/
public File creatSDFile(String dirName ,String fileName) throws IOException {
this.fileName = fileName;
this.dirName = dirName;
File file = new File(creatSDDir(dirName), fileName);
return file;
} public String getFileWholePath(){
return SD_PATH + dirName + "/" + fileName;
} /**
* 在SD卡上创建目录
*
* @param dirName
*/
public File creatSDDir(String dirName) {
File dir = new File(SD_PATH + dirName);
dir.mkdir();
return dir;
} /**
* 判断SD卡上的文件夹是否存在
*/
public boolean isFileExist(String fileName ,String dirName){
File file = new File(SD_PATH +dirName+"/"+ fileName);
return file.exists();
} /**
* 将一个InputStream里面的数据写入到SD卡中
*/
public File saveToSdCard(String dirName,String fileName,InputStream input){
File file = null;
OutputStream output = null;
try{
//创建目录
creatSDDir(dirName);
//建立文件
file = creatSDFile(dirName ,fileName);
output = new FileOutputStream(file);
byte buffer [] = new byte[5 * 1024];
int count = 0;
while((count = input.read(buffer)) != -1){
String str = new String(buffer,0,count);
//str = new String(str.getBytes("iso-8859-1"),"utf-8");
System.out.println("---------File Manager----start--------");
System.out.println(str);
System.out.println("---------File Manager-----end-------");
output.write(buffer);
}
output.flush();
}
catch(Exception e){
e.printStackTrace();
}
finally{
try{
output.close();
}
catch(Exception e){
e.printStackTrace();
}
}
return file;
} }
源码下载：http://download.csdn.net/detail/shark0017/7623057
