Android仿微信图片编辑处理：文字，马赛克，裁剪，涂鸦，旋转图片等
如图：
这个项目实现了微信图片编辑处理的关键功能，如给一张图片添加文字，打上马赛克，裁剪图片，在图片上手势涂鸦。引用了kareluo的Imaging库，但是kareluo的Imaging库示例代码有两个遗留问题需要重新解决：
1，它是用kotlin写的，我重新把kotlin代码部分用Java写了一遍。
2，kareluo的Imaging库中，编辑图片的IMGEditActivity接受两种传入的资源路径类型：asset和file。Android 4.4以下可以直接获取再拼装。但在高版本（大于4.4，API19）就不好办，且在大于4.4版本的机器上，用相册选择器选中的图片资源是以content://开头表示的，这需要把content://这样的路径重新转为file传过去。
我把上述两个问题解决后写了简单的测试：
package zhangphil.app;
import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import java.io.File;
import me.kareluo.imaging.IMGEditActivity;
public class MainActivity extends AppCompatActivity {
public static final int REQ_SELECT_PHOTO = 0xf0a;
private Bitmap avatarBitMap = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
seleteImg();
}
});
}
private void seleteImg() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, REQ_SELECT_PHOTO);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQ_SELECT_PHOTO: {
// 选取照片。
if (resultCode == RESULT_OK && data != null) {
try {
avatarBitMap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), data.getData());
//此处获得了Bitmap图片，可以用作设置头像等等。
} catch (Exception e) {
e.printStackTrace();
}
Intent intent = new Intent(this, IMGEditActivity.class);
try {
String uri_path = getFilePathByUri(this, data.getData());
Uri uri = Uri.fromFile(new File(uri_path));
System.out.println(uri.toString());
intent.putExtra(IMGEditActivity.EXTRA_IMAGE_URI, uri);
//intent.putExtra(IMGEditActivity.EXTRA_IMAGE_SAVE_PATH,);
startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
break;
}
default:
break;
}
}
@TargetApi(19)
public static String getFilePathByUri(Context context, Uri uri) {
String path = null;
// 以 file:// 开头的
if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
path = uri.getPath();
return path;
}
// 以 content:// 开头的，比如 content://media/extenral/images/media/17766
if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
if (columnIndex > -1) {
path = cursor.getString(columnIndex);
}
}
cursor.close();
}
return path;
}
// 4.4及之后的 是以 content:// 开头的，比如 content://com.android.providers.media.documents/document/image%3A235700
if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
if (DocumentsContract.isDocumentUri(context, uri)) {
if (isExternalStorageDocument(uri)) {
// ExternalStorageProvider
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
path = Environment.getExternalStorageDirectory() + "/" + split[1];
return path;
}
} else if (isDownloadsDocument(uri)) {
// DownloadsProvider
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),
Long.valueOf(id));
path = getDataColumn(context, contentUri, null, null);
return path;
} else if (isMediaDocument(uri)) {
// MediaProvider
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{split[1]};
path = getDataColumn(context, contentUri, selection, selectionArgs);
return path;
}
}
}
return null;
}
public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
String column = MediaStore.Images.Media.DATA;
String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
}
亲测在Android8.0上正常。
完整可运行的项目已经整理出来，上传到github：https://github.com/zhangphil/WeiXinPictureTool | 
转播
