android 实现APP中改变头像图片的实例代码

具体代码如下所示：

package com.example.studyapplication.fragment;
import android.app.activity;
import android.app.alertdialog;
import android.content.context;
import android.content.intent;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.graphics.porterduff;
import android.graphics.porterduffxfermode;
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.support.annotation.nullable;
import android.support.v4.app.fragment;
import android.text.spannable;
import android.text.spannablestring;
import android.text.spanned;
import android.text.method.linkmovementmethod;
import android.text.style.foregroundcolorspan;
import android.text.style.urlspan;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.button;
import android.widget.imagebutton;
import android.widget.imageview;
import android.widget.linearlayout;
import android.widget.textview;
import com.example.studyapplication.mainactivity;
import com.example.studyapplication.r;
import com.example.studyapplication.wode_activity;
import com.example.studyapplication.zhubanfangactivity;
import com.example.studyapplication.zhuceactivity;
import java.io.file;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.lang.ref.weakreference;
import static android.app.activity.result_ok;
public class wodefragment extends fragment implements view.onclicklistener {
  private view mview;
  private context mavtivity;
  button youhuiquan;
  button shoucang;
  button guanzhu;
  imageview shezhi;
  imageview xiaoxi;
  textview qiehuanweizhuban;
  static  textview denglu;
  linearlayout daifukuan;
  linearlayout daicanyu;
  linearlayout tuikuan;
  linearlayout yiwancheng;
  linearlayout qingxiandenglu;
  linearlayout log;
  linearlayout quanbudingdan;
  private button ll01,ll02,ll03;
  private context mcontext;
  private imagebutton touxiang;
  private bitmap head;// 头像bitmap
  private static string path = "/sdcard/myhead/";// sd路径
  activity mactivity;
  uri uritempfile;
  public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {
    mview = inflater.inflate(r.layout.wode_layout, null);
    mactivity=this.getactivity();
    //设置布局文件5888
    return mview;
  }
  @override
  public void oncreate(@nullable bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    this.mcontext = getactivity();
  }
    /*
    点击头像进行更换头像
     */
    touxiang.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        switch (v.getid()) {
          case r.id.touxiang:// 更换头像
            showtypedialog();
            break;
        }
      }
    });
  }
  private void initview() {
    ll01=(button)getactivity().findviewbyid(r.id.youhuiquan);
    ll02=(button) getactivity().findviewbyid(r.id.shoucang);
    ll03=(button)getactivity().findviewbyid(r.id.guanzhu);
    touxiang = (imagebutton)getactivity().findviewbyid(r.id.touxiang);
    bitmap bt = bitmapfactory.decodefile(path + "log.png");// 从sd卡中找头像，转换成bitmap
    if (bt != null) {
      @suppresswarnings("deprecation")
      drawable drawable = new bitmapdrawable(bt);// 转换成drawable
      touxiang.setimagedrawable(drawable);
    } else {
      /**
       * 如果sd里面没有则需要从服务器取头像，取回来的头像再保存在sd中
       *
       */
    }
  }
  private void showtypedialog() {
    //显示对话框
    alertdialog.builder builder = new alertdialog.builder(getactivity());
    final alertdialog dialog = builder.create();
    view view = view.inflate(getactivity(), r.layout.dialog_select_photo, null);
    textview tv_select_gallery = (textview) view.findviewbyid(r.id.tv_select_gallery);
    textview tv_select_camera = (textview) view.findviewbyid(r.id.tv_select_camera);
    tv_select_gallery.setonclicklistener(new view.onclicklistener() {// 在相册中选取
      @override
      public void onclick(view v) {
        intent intent1 = new intent(intent.action_pick, null);
        //打开文件
        intent1.setdataandtype(mediastore.images.media.external_content_uri, "image/log.png");
        startactivityforresult(intent1, 1);
         dialog.dismiss();
      }
    });
    tv_select_camera.setonclicklistener(new view.onclicklistener() {// 调用照相机
      @override
      public void onclick(view v) {
        intent intent2 = new intent(mediastore.action_image_capture);
        intent2.putextra(mediastore.extra_output,
            uri.fromfile(new file(environment.getexternalstoragedirectory(), "log.png")));
        startactivityforresult(intent2, 2);// 采用forresult打开
        dialog.dismiss();
      }
    });
    dialog.setview(view);
    dialog.show();
  }
  @override
  public void onactivityresult(int requestcode, int resultcode, intent data) {
    switch (requestcode) {
      case 1:
        if (resultcode == result_ok) {// 如果返回码是可以用的
          cropphoto(data.getdata());// 裁剪图片
        }
        break;
      case 2:
        if (resultcode == result_ok) {
          file temp = new file(environment.getexternalstoragedirectory() + "/head.jpg");
          cropphoto(uri.fromfile(temp));// 裁剪图片
        }
        break;
      case 3:
        if (data != null) {
          uri extras = data.getdata();
          //head = extras.getparcelable("data");
          try {
            head=bitmapfactory.decodestream(mactivity.getcontentresolver().openinputstream(uritempfile));
          } catch (filenotfoundexception e) {
            e.printstacktrace();
          }
          if (head != null) {
            /**
             * 上传服务器代码
             */
            // 让刚才选择裁剪得到的图片显示在界面上
            setpictoview(head);// 保存在sd卡中
            touxiang.setimagebitmap(head);// 用imagebutton显示出来
          }
        }
        break;
      default:
        break;
    }
    super.onactivityresult(requestcode, resultcode, data);
  }
  /**
   * 调用系统的裁剪功能
   *
   * @param uri
   */
  public void cropphoto(uri uri) {
    if(uri== null){
      log.i("tag","the uri is not exist.");
    }
    intent intent = new intent("com.android.camera.action.crop");
    intent.setdataandtype(uri, "image/*.png");
    //设置裁剪
    intent.putextra("crop", "true");
    // aspectx aspecty 是宽高的比例
    intent.putextra("aspectx", 1);
    intent.putextra("aspecty", 1);
    // outputx outputy 是裁剪图片宽高
    intent.putextra("outputx", 250);
    intent.putextra("outputy", 250);
    intent.putextra("return-data", true);
    uritempfile = uri.parse("file:///sdcard/temp.jpg");//重要，android4.0以上，本地地址前都加file://+/
    // uritempfile=uri;
    intent.putextra(mediastore.extra_output, uritempfile);
    intent.putextra("outputformat", bitmap.compressformat.jpeg.tostring());
    startactivityforresult(intent, 3);
  }
  private void setpictoview(bitmap mbitmap) {
    string sdstatus = environment.getexternalstoragestate();
    if (!sdstatus.equals(environment.media_mounted)) { // 检测sd是否可用
      return;
    }
    fileoutputstream b = null;
    file file = new file(path);
    file.mkdirs();// 创建文件夹
    string filename = path + "log.png";// 图片名字
    try {
      b = new fileoutputstream(filename);
      mbitmap.compress(bitmap.compressformat.jpeg, 100, b);// 把数据写入文件
    } catch (filenotfoundexception e) {
      e.printstacktrace();
    } finally {
      try {
        // 关闭流
        b.flush();
        b.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
  }
//生成圆角图片-------未使用
  private bitmap getroundedcornerbitmap(bitmap bitmap){
    bitmap roundbitmap = bitmap.createbitmap(bitmap.getwidth(),bitmap.getheight(), bitmap.config.argb_8888);
    canvas canvas =new canvas(roundbitmap);
    int color=0xff424242;
    paint paint=new paint();
    //设置圆形半径
    int radius;
    if( bitmap.getwidth()>bitmap.getheight()){
      radius=bitmap.getheight()/2;
    }else {
      radius=bitmap.getwidth()/2;
    }
    //绘制圆形
    paint.setantialias(true);
    canvas.drawargb(0,0,0,0);
    paint.setcolor(color);
    canvas.drawcircle(bitmap.getwidth()/2,bitmap.getheight()/2,radius,paint);
    paint.setxfermode(new porterduffxfermode(porterduff.mode.src_in));
    canvas.drawbitmap(bitmap,0,0,paint);
    return roundbitmap;
  }
}

注意：手机权限一定要设置，这个非常重要

androidmanifest.xml：

 <uses-permission android:name="android.permission.mount_unmount_filesystems"  tols:ignore="protectedpermissions" />

总结

以上所述是小编给大家介绍的android 实现app中改变头像图片的实例代码，希望对大家有所帮助