android怎样实现APP中改变头像图片

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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：

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