0

实际上我已经编写了一个从图库中选择图像的代码，但我不知道如何在其上手动绘制或编写文本。编辑后的图像应该单独保存在 sdcard 中。基本上我必须制作基本的绘画应用程序，其中画布将是我选择的图像，我的触摸被输入来画一个圆圈或任何东西。 

package listdisplay.example.com.photoedit;

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.net.Uri;
import android.os.ParcelFileDescriptor;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Display;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.FileDescriptor;
import java.io.IOException;

public class MainActivity_photoedit extends AppCompatActivity {
    private static final int RORC =0;
    ImageView iview;
    Button button,button2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_photoedit);
        iview= (ImageView) findViewById(R.id.imageView);

        button =(Button)findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
                                      @Override
                                      public void onClick(View view) {
                                          Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
                                          intent.addCategory(Intent.CATEGORY_OPENABLE);
                                          intent.setType("image/*");
                                          startActivityForResult(intent,RORC);
                                      }
                                  }

        );
}
    @Override
    public  void onActivityResult(int requestCode,int resultCode,Intent resultData){
        if(requestCode==RORC && resultCode==RESULT_OK){
            Uri uri =null;
            if(resultData!=null){
                uri=resultData.getData();
                try {
                    Bitmap bitmap= getBitmapFromUri(uri);



                    iview.setImageBitmap(bitmap);
                }
                catch (IOException e){
                    e.printStackTrace();
                }
            }
        }
    }
    private Bitmap getBitmapFromUri(Uri uri) throws IOException{
        ParcelFileDescriptor parcelFileDescriptor = getContentResolver().openFileDescriptor(uri,"r");
        FileDescriptor fileDescriptor= parcelFileDescriptor.getFileDescriptor();
        Bitmap bitmap = BitmapFactory.decodeFileDescriptor(fileDescriptor);

        parcelFileDescriptor.close();
        return bitmap;
    }
}
4

2 回答 2

1

此外，还有另一种方法是使用 FingerPaint Api。

对于从这里下载的代码，

"https://github.com/nikt/Finger-Paint"

是的，它也不使用图像视图，但它会从图库中选择图像并将其设置为绘图视图并在该图像上绘画。你也可以试试这个。

于 2017-01-04T07:55:13.853 回答
0

我找到了满足您要求的解决方案。所以试试这个，但是你必须使用绘图视图而不是图像视图来在从图库中挑选的图像上绘制或写入文本。

特此，我发布代码。

活动主.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:paddingBottom="5dp"
    android:paddingTop="5dp"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <ImageButton
            android:id="@+id/buttonNew"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:contentDescription="@string/start_new"
            android:src="@drawable/new_pic" />

        <ImageButton
            android:id="@+id/buttonBrush"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:contentDescription="@string/brush"
            android:src="@drawable/brush" />

        <ImageButton
            android:id="@+id/buttonErase"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:contentDescription="@string/erase"
            android:src="@drawable/eraser" />

        <ImageButton
            android:id="@+id/buttonSave"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:contentDescription="@string/save"
            android:src="@drawable/save" />

        <ImageButton
            android:id="@+id/buttonPickImage"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:contentDescription="@string/save"
            android:src="@drawable/save" />

    </LinearLayout>

    <com.wordpress.priyankvex.paintapp.DrawingView
        android:id="@+id/drawing"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginBottom="3dp"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_marginTop="3dp"
        android:layout_weight="1"
        android:background="@color/white" />

    <!-- Color pallet -->
    <LinearLayout
        android:id="@+id/paint_colors"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <ImageButton
            android:layout_width="@dimen/large_brush"
            android:layout_height="@dimen/large_brush"
            android:layout_margin="2dp"
            android:background="@color/skin"
            android:contentDescription="@string/paint"
            android:onClick="paintClicked"
            android:src="@drawable/pallet"
            android:tag="@color/skin" />

        <ImageButton
            android:layout_width="@dimen/large_brush"
            android:layout_height="@dimen/large_brush"
            android:layout_margin="2dp"
            android:background="@color/black"
            android:contentDescription="@string/paint"
            android:onClick="paintClicked"
            android:src="@drawable/pallet"
            android:tag="@color/black" />

        <ImageButton
            android:layout_width="@dimen/large_brush"
            android:layout_height="@dimen/large_brush"
            android:layout_margin="2dp"
            android:background="@color/red"
            android:contentDescription="@string/paint"
            android:onClick="paintClicked"
            android:src="@drawable/pallet"
            android:tag="@color/red" />

        <ImageButton
            android:layout_width="@dimen/large_brush"
            android:layout_height="@dimen/large_brush"
            android:layout_margin="2dp"
            android:background="@color/green"
            android:contentDescription="@string/paint"
            android:onClick="paintClicked"
            android:src="@drawable/pallet"
            android:tag="@color/green" />

        <ImageButton
            android:layout_width="@dimen/large_brush"
            android:layout_height="@dimen/large_brush"
            android:layout_margin="2dp"
            android:background="@color/blue"
            android:contentDescription="@string/paint"
            android:onClick="paintClicked"
            android:src="@drawable/pallet"
            android:tag="@color/blue" />

        <ImageButton
            android:layout_width="@dimen/large_brush"
            android:layout_height="@dimen/large_brush"
            android:layout_margin="2dp"
            android:background="@color/yellow"
            android:contentDescription="@string/paint"
            android:onClick="paintClicked"
            android:src="@drawable/pallet"
            android:tag="@color/yellow" />

    </LinearLayout>

</LinearLayout>

MainActivity.java ：

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

import java.util.UUID;


public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private DrawingView mDrawingView;
    private ImageButton currPaint, drawButton, eraseButton, newButton, saveButton, buttonPickImage;
    private float smallBrush, mediumBrush, largeBrush;
    private final int RESULT_LOAD_IMAGE = 20;
    private Uri pickedImage;
    private String imagePath = "";
    public Bitmap PaintBitmap;

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

        mDrawingView = (DrawingView) findViewById(R.id.drawing);
        // Getting the initial paint color.
        LinearLayout paintLayout = (LinearLayout) findViewById(R.id.paint_colors);
        // 0th child is white color, so selecting first child to give black as initial color.
        currPaint = (ImageButton) paintLayout.getChildAt(1);
        currPaint.setImageDrawable(getResources().getDrawable(R.drawable.pallet_pressed));
        drawButton = (ImageButton) findViewById(R.id.buttonBrush);
        drawButton.setOnClickListener(this);
        eraseButton = (ImageButton) findViewById(R.id.buttonErase);
        eraseButton.setOnClickListener(this);
        newButton = (ImageButton) findViewById(R.id.buttonNew);
        newButton.setOnClickListener(this);
        saveButton = (ImageButton) findViewById(R.id.buttonSave);
        saveButton.setOnClickListener(this);
        buttonPickImage = (ImageButton) findViewById(R.id.buttonPickImage);
        buttonPickImage.setOnClickListener(this);

        smallBrush = getResources().getInteger(R.integer.small_size);
        mediumBrush = getResources().getInteger(R.integer.medium_size);
        largeBrush = getResources().getInteger(R.integer.large_size);

        // Set the initial brush size
        mDrawingView.setBrushSize(mediumBrush);
    }

    /**
     * Method is called when color is clicked from pallet.
     *
     * @param view ImageButton on which click took place.
     */
    public void paintClicked(View view) {
        if (view != currPaint) {
            // Update the color
            ImageButton imageButton = (ImageButton) view;
            String colorTag = imageButton.getTag().toString();
            mDrawingView.setColor(colorTag);
            // Swap the backgrounds for last active and currently active image button.
            imageButton.setImageDrawable(getResources().getDrawable(R.drawable.pallet_pressed));
            currPaint.setImageDrawable(getResources().getDrawable(R.drawable.pallet));
            currPaint = (ImageButton) view;
            mDrawingView.setErase(false);
            mDrawingView.setBrushSize(mDrawingView.getLastBrushSize());
        }
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();
        switch (id) {
            case R.id.buttonBrush:
                // Show brush size chooser dialog
                showBrushSizeChooserDialog();
                break;
            case R.id.buttonErase:
                // Show eraser size chooser dialog
                showEraserSizeChooserDialog();
                break;
            case R.id.buttonNew:
                // Show new painting alert dialog
                showNewPaintingAlertDialog();
                break;
            case R.id.buttonSave:
                // Show save painting confirmation dialog.
                showSavePaintingConfirmationDialog();
                break;

            case R.id.buttonPickImage:
                // Show save painting confirmation dialog.
                Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(i, RESULT_LOAD_IMAGE);
                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK) {
            pickedImage = data.getData();
            String[] filePath = {MediaStore.Images.Media.DATA};
            Cursor cursor = getContentResolver().query(pickedImage, filePath, null, null, null);
            cursor.moveToFirst();
            imagePath = cursor.getString(cursor.getColumnIndex(filePath[0]));
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {

                // set Gallery Image to Drawing-view
                if (imagePath != null) {
                    PaintBitmap = getResizeBitmap(imagePath);
                    BitmapDrawable ob = new BitmapDrawable(getResources(), PaintBitmap);
                    mDrawingView.setBackgroundDrawable(ob);
                }
            }
        }
    }

    public static Bitmap getResizeBitmap(String path) {
        BitmapFactory.Options op = new BitmapFactory.Options();
        op.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bmap = BitmapFactory.decodeFile(path, op);
        int nh = (int) (bmap.getHeight() * (1024.0 / bmap.getWidth()));
        Bitmap bitmapThumbnail = Bitmap.createScaledBitmap(bmap, 1024, nh, true);
        int bitmapWidthMain = bitmapThumbnail.getWidth();
        int bitmapHeightMain = bitmapThumbnail.getHeight();
        return bitmapThumbnail;
    }
    private void showBrushSizeChooserDialog() {
        final Dialog brushDialog = new Dialog(this);
        brushDialog.setContentView(R.layout.dialog_brush_size);
        brushDialog.setTitle("Brush size:");
        ImageButton smallBtn = (ImageButton) brushDialog.findViewById(R.id.small_brush);
        smallBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDrawingView.setBrushSize(smallBrush);
                mDrawingView.setLastBrushSize(smallBrush);
                brushDialog.dismiss();
            }
        });
        ImageButton mediumBtn = (ImageButton) brushDialog.findViewById(R.id.medium_brush);
        mediumBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDrawingView.setBrushSize(mediumBrush);
                mDrawingView.setLastBrushSize(mediumBrush);
                brushDialog.dismiss();
            }
        });

        ImageButton largeBtn = (ImageButton) brushDialog.findViewById(R.id.large_brush);
        largeBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDrawingView.setBrushSize(largeBrush);
                mDrawingView.setLastBrushSize(largeBrush);
                brushDialog.dismiss();
            }
        });
        mDrawingView.setErase(false);
        brushDialog.show();
    }

    private void showEraserSizeChooserDialog() {
        final Dialog brushDialog = new Dialog(this);
        brushDialog.setTitle("Eraser size:");
        brushDialog.setContentView(R.layout.dialog_brush_size);
        ImageButton smallBtn = (ImageButton) brushDialog.findViewById(R.id.small_brush);
        smallBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDrawingView.setErase(true);
                mDrawingView.setBrushSize(smallBrush);
                brushDialog.dismiss();
            }
        });
        ImageButton mediumBtn = (ImageButton) brushDialog.findViewById(R.id.medium_brush);
        mediumBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDrawingView.setErase(true);
                mDrawingView.setBrushSize(mediumBrush);
                brushDialog.dismiss();
            }
        });
        ImageButton largeBtn = (ImageButton) brushDialog.findViewById(R.id.large_brush);
        largeBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDrawingView.setErase(true);
                mDrawingView.setBrushSize(largeBrush);
                brushDialog.dismiss();
            }
        });
        brushDialog.show();
    }

    private void showNewPaintingAlertDialog() {
        AlertDialog.Builder newDialog = new AlertDialog.Builder(this);
        newDialog.setTitle("New drawing");
        newDialog.setMessage("Start new drawing (you will lose the current drawing)?");
        newDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                mDrawingView.startNew();
                dialog.dismiss();
            }
        });
        newDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });
        newDialog.show();
    }

    private void showSavePaintingConfirmationDialog() {
        AlertDialog.Builder saveDialog = new AlertDialog.Builder(this);
        saveDialog.setTitle("Save drawing");
        saveDialog.setMessage("Save drawing to device Gallery?");
        saveDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                //save drawing
                mDrawingView.setDrawingCacheEnabled(true);
                String imgSaved = MediaStore.Images.Media.insertImage(
                        getContentResolver(), mDrawingView.getDrawingCache(),
                        UUID.randomUUID().toString() + ".png", "drawing");
                if (imgSaved != null) {
                    Toast savedToast = Toast.makeText(getApplicationContext(),
                            "Drawing saved to Gallery!", Toast.LENGTH_SHORT);
                    savedToast.show();
                } else {
                    Toast unsavedToast = Toast.makeText(getApplicationContext(),
                            "Oops! Image could not be saved.", Toast.LENGTH_SHORT);
                    unsavedToast.show();
                }
                // Destroy the current cache.
                mDrawingView.destroyDrawingCache();
            }
        });
        saveDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });
        saveDialog.show();
    }

}

清单.xml：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

试试这个代码，它包括用于在不同画笔大小的图像上绘制文本的画笔、用于在文本上绘制不同颜色的文本的橡皮擦和颜色选择器，是的，它会将图像与文本一起保存在图库中。

在此，我附上截图，

在此处输入图像描述

希望，它会帮助你。:)

于 2017-01-04T07:40:28.177 回答