Android编程图片操作类定义与用法示例【拍照，相册选图及裁剪】

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
/**
* Android中图片操作（拍照，相册图片选择及图片裁剪）
* 作者：ldm
* 时间：20162016/7/11 09:09
*/
public class ImageTestActivity extends Activity implements View.OnClickListener {
//拍照
private Button take_photo;
//从相册中选择图片
private Button local_pic;
//图片展示
private ImageView upload_image;
//定义操作常量
private final static int TAKE_PHOTO_REQUEST = 1;
private final static int LOCAL_PICS_REQUEST = 2;
private final static int UPLOAD_PIC_REQUEST = 3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_test);
//初始化控件及监听事件
initViews();
}
private void initViews() {
this.upload_image = (ImageView) findViewById(R.id.upload_image);
this.take_photo = (Button) findViewById(R.id.take_photo);
this.local_pic = (Button) findViewById(R.id.local_pics);
this.take_photo.setOnClickListener(this);
this.local_pic.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.take_photo) {//拍照
//调用系统拍照In
Intent photoIn = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(photoIn, TAKE_PHOTO_REQUEST);
} else if (view.getId() == R.id.local_pics) {//从相册选择
Intent picsIn = new Intent(Intent.ACTION_GET_CONTENT);
picsIn.setType("image/*");//设置选择的数据类型为图片类型
startActivityForResult(picsIn, LOCAL_PICS_REQUEST);
}
}
//拍照或选择相册后，数据在这里处理
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (null == data) {
return;
}
switch (requestCode) {
case TAKE_PHOTO_REQUEST:
Bundle bundle = data.getExtras();//获取到图片数据
if (null != bundle) {
Bitmap bm = bundle.getParcelable("data");
//把图片展示在ImView上
//          upload_image.setImageBitmap(bm);
//对图片剪
Uri uri = ImageUtils.saveBitmapToSdCard(bm);
startImageCrop(uri);
}
break;
case LOCAL_PICS_REQUEST:
Uri uri = data.getData();//从图片的Uri是以cotent://格式开头的
//获取到图片
Bitmap bm = ImageUtils.uri2Bitmap(ImageTestActivity.this, uri);
//把图片展示在ImView上
//        upload_image.setImageBitmap(bm);
//把拍照的图片保存到本地并转换成文件格式的Uri
Uri fileUri = ImageUtils.saveBitmapToSdCard(bm);
//对图片剪
startImageCrop(fileUri);
break;
case UPLOAD_PIC_REQUEST:
//把裁剪后的图片展示出来
Bundle b = data.getExtras();
Bitmap bitmap = b.getParcelable("data");
//图片展示出来
upload_image.setImageBitmap(bitmap);
break;
}
}
/**
* @param
* @description 图片裁剪
* @author ldm
* @time 2016/7/11 10:07
*/
private void startImageCrop(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");//设置Uri及类型
intent.putExtra("crop", "true");//
intent.putExtra("aspectX", 2);//X方向上的比例
intent.putExtra("aspectY", 1);//Y方向上的比例
intent.putExtra("outputX", 200);//裁剪区的X方向宽
intent.putExtra("outputY", 100);//裁剪区的Y方向宽
intent.putExtra("scale", true);//是否保留比例
intent.putExtra("outputFormat", Bitmap.CompressFormat.PNG.toString());
intent.putExtra("return-data", true);//是否将数据保留在Bitmap中返回dataParcelable相应的Bitmap数据
startActivityForResult(intent, UPLOAD_PIC_REQUEST);
}
}

<?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" 
<Button
android:id="@+id/take_photo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="拍照上传" / 
<Button
android:id="@+id/local_pics"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="本地图库上传" / 
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="图片信息展示"
android:layout_marginLeft="10dp"
android:textSize="16sp"/ 
<ImageView
android:id="@+id/upload_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"/ 
</LinearLayout 

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.text.format.DateFormat;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Calendar;
import java.util.Locale;
/**
* description：从图片中获取到的Uri是以content://开头的,从U中找到对应图片
* 作者：ldm
* 间：20162016/7/11 09:47
*/
public class ImageUtils {
public static Bitmap uri2Bitmap(Context mContext, Uri uri) {
InputStream in = null;
try {
in = mContext.getContentResolver().openInputStream(uri);
//从输入流中获取到图片
Bitmap bm = BitmapFactory.decodeStream(in);
in.close();
return bm;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* @param
* @description 保存图片到手机SD卡, 并返回图片对应的文件i
* @author ldm
* @time 2016/7/11 9:55
*/
public static Uri saveBitmapToSdCard(Bitmap bm) {
//自定义图片名称
String name = DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".png";
//定义图片存放的位置
File tempFile = new File("/sdcard/Image/");
if (!tempFile.exists()) {
tempFile.mkdir();
}
String fileName = "/sdcard/Image/" + name;
File pic = new File(fileName);
try {
FileOutputStream os = new FileOutputStream(pic);
//对图片进行压缩
bm.compress(Bitmap.CompressFormat.PNG, 100, os);
os.flush();
os.close();
return Uri.fromFile(pic);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" / 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" / 
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/