5分钟实现Android中更换头像功能

写在前面：
更换头像这个功能在用户界面几乎是100%出现的。通过拍摄照片或者调用图库中的图片，并且进行剪裁，来进行头像的设置。
功能相关截图如下：

下面我们直接看看完整代码吧：

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public class UserActivity extends BaseActivity implements OnClickListener { private ImageView iv_photo; private Bitmap head;// 头像Bitmap private static String path = "/sdcard/myHead/";// sd路径 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); initView(); initListener(); } private void initView() { setContentView(R.layout.activity_user); iv_photo = (ImageView) findViewById(R.id.iv_photo); Bitmap bt = BitmapFactory.decodeFile(path + "head.jpg");// 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 iv_photo.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 initListener() { iv_photo.setOnClickListener(this); }   @Override public void onClick(View v) { switch (v.getId()) { case R.id.iv_photo:// 更换头像 showTypeDialog(); break; } } private void showTypeDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); final AlertDialog dialog = builder.create(); View view = View.inflate(this, 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 OnClickListener() {// 在相册中选取 @Override public void onClick(View v) { Intent intent1 = new Intent(Intent.ACTION_PICK, null); intent1.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*"); startActivityForResult(intent1, 1); dialog.dismiss(); } }); tv_select_camera.setOnClickListener(new 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(), "head.jpg"))); startActivityForResult(intent2, 2);// 采用ForResult打开 dialog.dismiss(); } }); dialog.setView(view); dialog.show(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case 1: if (resultCode == RESULT_OK) { 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) { Bundle extras = data.getExtras(); head = extras.getParcelable("data"); if (head != null) { /** * 上传服务器代码 */ setPicToView(head);// 保存在SD卡中 iv_photo.setImageBitmap(head);// 用ImageView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) { Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); 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", 150); intent.putExtra("outputY", 150); intent.putExtra("return-data", true); 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 + "head.jpg";// 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(); } } } }

再添加以下权限

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<uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <uses-permission android:name="android.permission.INTERNET" />

Dialog的xml文件如下：

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/tv_select_gallery" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:padding="20dp" android:text="从图库中选取" android:textColor="#000" android:textSize="20sp" /> <View android:layout_width="match_parent" android:layout_height="1dp" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:background="#000" /> <TextView android:id="@+id/tv_select_camera" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:padding="20dp" android:text="拍摄照片" android:textColor="#000" android:textSize="20sp" /> </LinearLayout>

代码的注释还算全面，仔细阅读一定能看懂，大家可以试试这个demo~这样一个更换头像的功能就实现了。