android 實(shí)現(xiàn)APP中改變頭像圖片的實(shí)例代碼

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;// 頭像Bitmap
  private static String path = "/sdcard/myHead/";// sd路徑
  Activity mActivity;
  Uri uritempFile;
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    mView = inflater.inflate(R.layout.wode_layout, null);
    mActivity=this.getActivity();
    //設(shè)置布局文件5888
    return mView;
  }
  @Override
  public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.mContext = getActivity();
  }
    /*
    點(diǎn)擊頭像進(jìn)行更換頭像
     */
    touxiang.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        switch (v.getId()) {
          case R.id.touxiang:// 更換頭像
            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");// 從SD卡中找頭像，轉(zhuǎn)換成Bitmap
    if (bt != null) {
      @SuppressWarnings("deprecation")
      Drawable drawable = new BitmapDrawable(bt);// 轉(zhuǎn)換成drawable
      touxiang.setImageDrawable(drawable);
    } else {
      /**
       * 如果SD里面沒(méi)有則需要從服務(wù)器取頭像，取回來(lái)的頭像再保存在SD中
       *
       */
    }
  }
  private void showTypeDialog() {
    //顯示對(duì)話框
    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() {// 在相冊(cè)中選取
      @Override
      public void onClick(View v) {
        Intent intent1 = new Intent(Intent.ACTION_PICK, null);
        //打開(kāi)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() {// 調(diào)用照相機(jī)
      @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打開(kāi)
        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) {// 如果返回碼是可以用的
          cropPhoto(data.getData());// 裁剪圖片
        }
        break;
      case 2:
        if (resultCode == RESULT_OK) {
          File temp = new File(Environment.getExternalStorageDirectory() + "/head.jpg");
          cropPhoto(Uri.fromFile(temp));// 裁剪圖片
        }
        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) {
            /**
             * 上傳服務(wù)器代碼
             */
            // 讓剛才選擇裁剪得到的圖片顯示在界面上
            setPicToView(head);// 保存在SD卡中
            touxiang.setImageBitmap(head);// 用ImageButton顯示出來(lái)
          }
        }
        break;
      default:
        break;
    }
    super.onActivityResult(requestCode, resultCode, data);
  }
  /**
   * 調(diào)用系統(tǒng)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");
    //設(shè)置裁剪
    intent.putExtra("crop", "true");
    // aspectX aspectY 是寬高的比例
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    // outputX outputY 是裁剪圖片寬高
    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)) { // 檢測(cè)sd是否可用
      return;
    }
    FileOutputStream b = null;
    File file = new File(path);
    file.mkdirs();// 創(chuàng)建文件夾
    String fileName = path + "log.png";// 圖片名字
    try {
      b = new FileOutputStream(fileName);
      mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把數(shù)據(jù)寫(xiě)入文件
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } finally {
      try {
        // 關(guān)閉流
        b.flush();
        b.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
//生成圓角圖片-------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();
    //設(shè)置圓形半徑
    int radius;
    if( bitmap.getWidth()>bitmap.getHeight()){
      radius=bitmap.getHeight()/2;
    }else {
      radius=bitmap.getWidth()/2;
    }
    //繪制圓形
    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;
  }
}

 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"  tols:ignore="ProtectedPermissions" />