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"/>