android完美实现 拍照 选择图片 剪裁等代码分享

前言，版本兼容问题主要是由于4.4以前和4.4以后的uri的格式不同所造成的错误

1.拍照 和选择图片
  ①选择图片

 intent = new intent(intent.action_get_content);
       intent.settype("image/*");
       startactivityforresult(intent, gallery_request_code);

  ②拍照

 intent = new intent(mediastore.action_image_capture);
       startactivityforresult(intent, camera_request_code);

2.获取系统传来的值

标记符

 private static int camera_request_code = 1;
 private static int gallery_request_code = 2;
 private static int crop_request_code = 3;



 @override
 protected void onactivityresult(int requestcode, int resultcode, intent data) {
   if (requestcode == camera_request_code) {
     if (data == null) {
       return;
     } else { //拍照
       bundle extras = data.getextras();
       if (extras != null) {
         bitmap bm = extras.getparcelable("data");
         uri uri = savebitmap(bm);
         startimagezoom(uri);
       }
     }
   } else if (requestcode == gallery_request_code) {
     if (data == null) {//相册
       return;
     }
     uri uri;
     uri = data.getdata();
     uri fileuri = converturi(uri);
     startimagezoom(fileuri);
   } else if (requestcode == crop_request_code) {
     if (data == null) {
       return;
     }//剪裁后的图片
     bundle extras = data.getextras();
     if (extras == null) {
       return;
     }
     bitmap bm = extras.getparcelable("data");
     showimageview(bm);
   }
 }

3.图片选取后 根据url 转成流 并保存

private uri converturi(uri uri) {
    inputstream is = null;
    try {
      is = getcontentresolver().openinputstream(uri);
      bitmap bitmap = bitmapfactory.decodestream(is);
      is.close();
      return savebitmap(bitmap);
    } catch (filenotfoundexception e) {
      e.printstacktrace();
      return null;
    } catch (ioexception e) {
      e.printstacktrace();
      return null;
    }
  }

4.保存图片 记得加权限

private uri savebitmap(bitmap bm) {
    file tmpdir = new file(environment.getexternalstoragedirectory()
        + "/xiaoxin");
    if (!tmpdir.exists()) {
      tmpdir.mkdir();
    }
    file img = new file(tmpdir.getabsolutepath() + "love.png");
    try {
      fileoutputstream fos = new fileoutputstream(img);
      bm.compress(bitmap.compressformat.png, 85, fos);
      fos.flush();
      fos.close();
      toast.maketext(mainactivity.this, "成功了", toast.length_short).show();
      return uri.fromfile(img);
    } catch (filenotfoundexception e) {
      toast.maketext(mainactivity.this, "失敗了", toast.length_short).show();
      e.printstacktrace();
      return null;
    } catch (ioexception e) {
      e.printstacktrace();
      toast.maketext(mainactivity.this, "失敗了", toast.length_short).show();
      return null;
    }

  }

5.剪裁图片

/**
   * 剪裁图片
   * 
   * @param uri
   */
  private void startimagezoom(uri uri) {
    intent intent = new intent("com.android.camera.action.crop");
    intent.setdataandtype(uri, "image/*");
    intent.putextra("crop", "true");
    intent.putextra("aspectx", 1);
    intent.putextra("aspecty", 1);
    intent.putextra("outputx", 150);
    intent.putextra("outputy", 150);
    intent.putextra("return-data", true);
    startactivityforresult(intent, crop_request_code);
  }

下面我们再来看一个实例：先是代码的部分，部分是从网路上摘录的，自己整理后当做工具类使用

配置文件：布局很简单，一个imagebutton和一个button，点击都可以实现图像选择的功能，具体的实现根据大家在实际中用的效果而定
—————————————————————————————————————————————————
androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.cogent.piccut"
  android:versioncode="1"
  android:versionname="1.0" >
 
  <uses-sdk android:minsdkversion="10" />
 
  <application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
      android:label="@string/app_name"
      android:name=".piccutactivity"
      android:screenorientation="portrait" >
      <intent-filter >
        <action android:name="android.intent.action.main" />
 
        <category android:name="android.intent.category.launcher" />
      </intent-filter>
    </activity>
  </application>
 
</manifest>

—————————————————————————————————————————————————
java代码：

package com.cogent.piccut;

import java.io.file;
import java.text.simpledateformat;
import java.util.date;

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;

public class piccutactivity extends activity implements onclicklistener {
  private imagebutton img_btn;
  private button btn;
  private static final int photo_request_takephoto = 1;// 拍照
  private static final int photo_request_gallery = 2;// 从相册中选择
  private static final int photo_request_cut = 3;// 结果
  // 创建一个以当前时间为名称的文件
  file tempfile = new file(environment.getexternalstoragedirectory(),getphotofilename());

  /** called when the activity is first created. */
  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.main);
    init();
  }

  //初始化控件
  private void init() {
    img_btn = (imagebutton) findviewbyid(r.id.img_btn);
    btn = (button) findviewbyid(r.id.btn);
    
    //为imagebutton和button添加监听事件
    img_btn.setonclicklistener(this);
    btn.setonclicklistener(this);
  }

  //点击事件
  @override
  public void onclick(view v) {
    // todo auto-generated method stub
    switch (v.getid()) {
    case r.id.img_btn:
      showdialog();
      break;

    case r.id.btn:
      showdialog();
      break;
    }

  }

  
  //提示对话框方法
  private void showdialog() {
    new alertdialog.builder(this)
        .settitle("头像设置")
        .setpositivebutton("拍照", new dialoginterface.onclicklistener() {

          @override
          public void onclick(dialoginterface dialog, int which) {
            // todo auto-generated method stub
            dialog.dismiss();
            // 调用系统的拍照功能
            intent intent = new intent(mediastore.action_image_capture);
            // 指定调用相机拍照后照片的储存路径
            intent.putextra(mediastore.extra_output,uri.fromfile(tempfile));
            startactivityforresult(intent, photo_request_takephoto);
          }
        })
        .setnegativebutton("相册", new dialoginterface.onclicklistener() {

          @override
          public void onclick(dialoginterface dialog, int which) {
            // todo auto-generated method stub
            dialog.dismiss();
            intent intent = new intent(intent.action_pick, null);
            intent.setdataandtype(mediastore.images.media.external_content_uri,"image/*");
            startactivityforresult(intent, photo_request_gallery);
          }
        }).show();
  }

  @override
  protected void onactivityresult(int requestcode, int resultcode, intent data) {
    // todo auto-generated method stub

    switch (requestcode) {
    case photo_request_takephoto:
      startphotozoom(uri.fromfile(tempfile), 150);
      break;

    case photo_request_gallery:
      if (data != null)
        startphotozoom(data.getdata(), 150);
      break;

    case photo_request_cut:
      if (data != null) 
        setpictoview(data);
      break;
    }
    super.onactivityresult(requestcode, resultcode, data);

  }

  private void startphotozoom(uri uri, int size) {
    intent intent = new intent("com.android.camera.action.crop");
    intent.setdataandtype(uri, "image/*");
    // crop为true是设置在开启的intent中设置显示的view可以剪裁
    intent.putextra("crop", "true");

    // aspectx aspecty 是宽高的比例
    intent.putextra("aspectx", 1);
    intent.putextra("aspecty", 1);

    // outputx,outputy 是剪裁图片的宽高
    intent.putextra("outputx", size);
    intent.putextra("outputy", size);
    intent.putextra("return-data", true);

    startactivityforresult(intent, photo_request_cut);
  }

  //将进行剪裁后的图片显示到ui界面上
  private void setpictoview(intent picdata) {
    bundle bundle = picdata.getextras();
    if (bundle != null) {
      bitmap photo = bundle.getparcelable("data");
      drawable drawable = new bitmapdrawable(photo);
      img_btn.setbackgrounddrawable(drawable);
    }
  }

  // 使用系统当前日期加以调整作为照片的名称
  private string getphotofilename() {
    date date = new date(system.currenttimemillis());
    simpledateformat dateformat = new simpledateformat("'img'_yyyymmdd_hhmmss");
    return dateformat.format(date) + ".jpg";
  }
}

心得总结：androi系统内部自带了图片的剪裁功能，开发是只要调用即可，intent的很多用法比较实用，但是太多了，需要用到的时候去查询或者平时多看看官方文档，很多代码看着简单但还是要实际自己去写更好些，理解的更深入一些。