插入图像（来自手机的图像库）在Edittext内联文本

Question

我正在尝试在Android上的EditText小部件中插入内嵌文本的图像。当我点击“Take”按钮时，我在对话框中选择“Choose From Gallery”。当我从Android图像库中选择一个图像时，会弹出“字符串”Toast消息，但图像不会插入与文本内联的EditText中。这是我正在使用的源代码：

BasicService.showDocument()

这是XML布局代码：     

import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Camera;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
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.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ImageSpan;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;

import com.example.kh9275.stuff.R;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

EditText et;
Button keyboard, camera, take;
LinearLayout cameraLayout;
GridLayout grid;
SharedPreferences prefs;
SharedPreferences.Editor editor;
static int index;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    et = (EditText) findViewById(R.id.et);
    keyboard = (Button) findViewById(R.id.keyboard);
    camera = (Button) findViewById(R.id.camera);
    take = (Button) findViewById(R.id.take);
    cameraLayout = (LinearLayout) findViewById(R.id.cameraLayout);
    cameraLayout.setVisibility(View.GONE);
    grid = (GridLayout) findViewById(R.id.grid);

    prefs = getSharedPreferences("stuff", Context.MODE_PRIVATE);
    index = prefs.getInt("index", 1);
    Toast.makeText(getApplicationContext(), "" + index, Toast.LENGTH_LONG).show();
    editor = prefs.edit();
    int i = 1;
    while (i < index) {
        String s = "" + i;
        String path = getPath(this, Uri.parse(prefs.getString(s, "string")));

        final ImageView iv = new ImageView(this);
        Bitmap b = null;
        try {
            b = getThumbnail(getContentResolver(), path);
        } catch (Exception e) {
            e.printStackTrace();
        }

        iv.setImageBitmap(b);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(300, 300);
        iv.setLayoutParams(layoutParams);

        iv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addImageBetweentext(iv.getDrawable());
            }
        });
        grid.addView(iv);
        i++;
    }

    keyboard.setOnClickListener(this);
    camera.setOnClickListener(this);
    take.setOnClickListener(this);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1) {
        //camera
        String[] columns = {MediaStore.Images.Media.DATA, MediaStore.Images.ImageColumns.DATA};

        Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null,
                MediaStore.MediaColumns.DATE_ADDED + " DESC");

        int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        String path = cursor.getString(columnIndex);

        cursor.close();

        Uri uri = Uri.fromFile(new File(path));
        int i = prefs.getInt("index", 1);
        i++;
        editor.putInt("index", i);
        editor.putString("" + i, uri.toString());
        editor.commit();
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        mediaScanIntent.setData(uri);
        this.sendBroadcast(mediaScanIntent);
        Toast.makeText(getApplicationContext(), uri.toString(), Toast.LENGTH_LONG).show();

        Bitmap b = null;
        try {
            b = getThumbnail(getContentResolver(), path);
        } catch (Exception e) {
            e.printStackTrace();
        }
        final ImageView iv = new ImageView(this);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(300, 300);
        iv.setLayoutParams(layoutParams);
        iv.setImageBitmap(b);
        iv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addImageBetweentext(iv.getDrawable());
            }
        });
        grid.addView(iv);

    }
    if (requestCode == 2) {
        //from gallery
        Uri uri = data.getData();
        int i = prefs.getInt("index", 1);
        i++;
        editor.putInt("index", i);
        editor.putString("" + i, uri.toString());
        editor.commit();

        Toast.makeText(getApplicationContext(), prefs.getString("1", "string"), Toast.LENGTH_LONG).show();

        final ImageView iv = new ImageView(this);
        Bitmap b = null;
        try {
            b = getThumbnail(getContentResolver(), getPath(getApplicationContext(), uri));
        } catch (Exception e) {
            e.printStackTrace();
        }
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(300, 300);
        iv.setLayoutParams(layoutParams);
        iv.setImageBitmap(b);
        iv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addImageBetweentext(iv.getDrawable());
            }
        });
        grid.addView(iv);
    }
}

@Override
public void onClick(View v) {
    View view = this.getCurrentFocus();
    switch (v.getId()) {
        case R.id.keyboard:
            cameraLayout.setVisibility(View.GONE);
            et.hasFocus();
            if (view != null) {
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.showSoftInput(view, 0);
            }
            break;
        case R.id.camera:
            cameraLayout.setVisibility(View.VISIBLE);
            et.clearFocus();
            if (view != null) {
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
            }
            break;
        case R.id.take:
            AlertDialog.Builder alert = new AlertDialog.Builder(this);
            alert.setTitle("Insert a photo");
            alert.setNegativeButton("Take from camera", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    startActivityForResult(i, 1);
                }
            });
            alert.setPositiveButton("Choose from gallery", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Intent gallery = new Intent(Intent.ACTION_GET_CONTENT, null);
                    gallery.setType("image/*");
                    gallery.addCategory(Intent.CATEGORY_OPENABLE);
                    startActivityForResult(Intent.createChooser(gallery, "Select an image"), 2);
                }
            });
            alert.show();
            break;
    }
}

public static Bitmap getThumbnail(ContentResolver cr, String path) throws Exception {

    Cursor ca = cr.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[]{MediaStore.MediaColumns._ID}, MediaStore.MediaColumns.DATA + "=?", new String[]{path}, null);
    if (ca != null && ca.moveToFirst()) {
        int id = ca.getInt(ca.getColumnIndex(MediaStore.MediaColumns._ID));
        ca.close();
        return MediaStore.Images.Thumbnails.getThumbnail(cr, id, MediaStore.Images.Thumbnails.MICRO_KIND, null);
    }

    ca.close();
    return null;

}

private void addImageBetweentext(Drawable drawable) {
    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());

    int selectionCursor = et.getSelectionStart();
    et.getText().insert(selectionCursor, ".");
    selectionCursor = et.getSelectionStart();

    SpannableStringBuilder builder = new SpannableStringBuilder(et.getText());
    builder.setSpan(new ImageSpan(drawable), selectionCursor - ".".length(), selectionCursor,
            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    et.setText(builder);
    et.setSelection(selectionCursor);
}

@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {

    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

    // DocumentProvider
    if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
        // ExternalStorageProvider
        if (isExternalStorageDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            if ("primary".equalsIgnoreCase(type)) {
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            }

            // TODO handle non-primary volumes
        }
        // DownloadsProvider
        else if (isDownloadsDocument(uri)) {

            final String id = DocumentsContract.getDocumentId(uri);
            final Uri contentUri = ContentUris.withAppendedId(
                    Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

            return getDataColumn(context, contentUri, null, null);
        }
        // MediaProvider
        else if (isMediaDocument(uri)) {
            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]
            };

            return getDataColumn(context, contentUri, selection, selectionArgs);
        }
    }
    // MediaStore (and general)
    else if ("content".equalsIgnoreCase(uri.getScheme())) {
        return getDataColumn(context, uri, null, null);
    }
    // File
    else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    }

    return null;
}

public static String getDataColumn(Context context, Uri uri, String selection,
                                   String[] selectionArgs) {

    Cursor cursor = null;
    final String column = "_data";
    final String[] projection = {
            column
    };

    try {
        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                null);
        if (cursor != null && cursor.moveToFirst()) {
            final int column_index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(column_index);
        }
    } finally {
        if (cursor != null)
            cursor.close();
    }
    return null;
}

public static boolean isExternalStorageDocument(Uri uri) {
    return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

public static boolean isDownloadsDocument(Uri uri) {
    return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}

public static boolean isMediaDocument(Uri uri) {
    return "com.android.providers.media.documents".equals(uri.getAuthority());
}
}

我需要用什么代码才能完成此操作？