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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