Android 项目实战之头像选择功能

/**
  * 选择图片（从相册或相机）
  * @param uri 相机存储uri
  * @return
  */
 public static Intent getPhotoSelectIntent(Uri uri){
  Intent take = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
  take.addCategory(Intent.CATEGORY_DEFAULT);
  take.putExtra(MediaStore.EXTRA_OUTPUT, uri);
  Intent pics = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
  Intent chose= Intent.createChooser(pics,"选择图片");
  chose.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{take});
  return chose;
 }
 /**
  * 图片裁剪
  * @param inputUri 需要裁剪的图片
  * @param outputUri 裁剪后存储位置
  * @param width 裁剪宽度
  * @param height 裁剪高度
  * @return
  */
 public static Intent getImageCropIntent(Uri inputUri, Uri outputUri, int width, int height) {
  Intent intent = new Intent("com.android.camera.action.CROP");
  intent.setDataAndType(inputUri, "image/*");
  // 下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪
  intent.putExtra("crop", "true");
  intent.putExtra("scale", true); // 去黑边
  intent.putExtra("scaleUpIfNeeded", true); // 去黑边
  // aspectX aspectY 裁剪框宽高比例
  intent.putExtra("aspectX", width); // 输出是X方向的比例
  intent.putExtra("aspectY", height);
  // outputX outputY 输出图片宽高，切忌不要再改动下列数字，会卡死
  intent.putExtra("outputX", width); // 输出X方向的像素
  intent.putExtra("outputY", height);
  intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
  intent.putExtra("noFaceDetection", true);
  intent.putExtra(MediaStore.EXTRA_OUTPUT, outputUri);
  intent.putExtra("return-data", false); // 设置为不返回数据
  return intent;
 }

b.ivAvatar.setOnClickListener {
   mTakePhotoFile = File(getPicPath() + File.separator + System.currentTimeMillis() + ".jpeg")
   val uri = Uri.fromFile(mTakePhotoFile)
   startActivityForResult(IntentUtils.getPhotoSelectIntent( uri), TAKE_PHOTO_REQ)
  }

public static Uri getContentUri(Context context, File file) {
  String filePath = file.getAbsolutePath();
  Cursor cursor = context.getContentResolver().query(
    MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
    new String[] { MediaStore.Images.Media._ID },
    MediaStore.Images.Media.DATA + "=? ",
    new String[] { filePath }, null);
  if (cursor != null && cursor.moveToFirst()) {
   int id = cursor.getInt(cursor
     .getColumnIndex(MediaStore.MediaColumns._ID));
   Uri baseUri = Uri.parse("content://media/external/images/media");
   return Uri.withAppendedPath(baseUri, "" + id);
  } else {
   if (file.exists()) {
    ContentValues values = new ContentValues();
    values.put(MediaStore.Images.Media.DATA, filePath);
    return context.getContentResolver().insert(
      MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
   } else {
    return null;
   }
  }
 }

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
  super.onActivityResult(requestCode, resultCode, data)
  if(resultCode != -1) {
   return
  }
  when (requestCode) {
   TAKE_PHOTO_REQ -> {
    // 处理图片选择结果
    mCutPhotoFile = File(getPicPath() + File.separator + "avatar_" + System.currentTimeMillis() + "jpeg")
    val cutUri = Uri.fromFile(mCutPhotoFile)
    if (data != null){
     startActivityForResult(IntentUtils.getImageCropIntent(data.data, cutUri, 200, 200), CUT_PHOTO_REQ)
    } else {
     val uri = UriUtils.getContentUri(applicationContext, mTakePhotoFile)
     startActivityForResult(IntentUtils.getImageCropIntent(uri, cutUri, 200, 200), CUT_PHOTO_REQ)
    }
   }
   CUT_PHOTO_REQ -> {
    // 处理图片裁剪结果
   }
  }
 }

<paths xmlns:android="http://schemas.android.com/apk/res/android">
 <external-path path="Android/data/com/example/sunmoon/images" name="sdcard_files" />
 <external-files-path path="Android/data/com/example/sunmoon/images" name="camera_has_sdcard"/>
 <files-path path="Android/data/com/example/sunmoon/other"  name="camera_no_sdcard"/>
 <external-path path="Android/data/com/example/sunmoon" name="files_root" />
 <external-path path="." name="external_storage_root" />
</paths>

...
<application>
  <provider
   android:name="android.support.v4.content.FileProvider"
   android:authorities="com.example.sunmoon.provider"
   android:exported="false"
   android:grantUriPermissions="true">
   <meta-data
    android:name="android.support.FILE_PROVIDER_PATHS"
    android:resource="@xml/provider_paths"/>
  </provider>
 ...
</application>
...