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我想知道我是否可以将在 drawView 上绘制的图像保存到指定的文件夹中。例如，我想将图像保存到 myLectureImage 文件夹。而且我想检索应用程序上的图像。

谢谢你的帮助。

package com.example.ddsk;

import java.util.UUID;
import com.example.ddsk.myLectureView;
import com.example.ddsk.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.Toast;

public class Drawing extends Activity implements OnClickListener{

private Button btnback;
private myLectureView drawView;
private ImageButton currPaint, drawBtn, eraseBtn, newBtn, saveBtn;
private float smallBrush, mediumBrush, largeBrush;

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


    drawView = (myLectureView)findViewById(R.id.drawing);
    LinearLayout paintLayout = (LinearLayout)findViewById(R.id.paint_colors);
    currPaint = (ImageButton)paintLayout.getChildAt(0);
    currPaint.setImageDrawable(getResources().getDrawable(R.drawable.paint_pressed));

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

    drawBtn = (ImageButton)findViewById(R.id.draw_btn);
    drawBtn.setOnClickListener(this);
    drawView.setBrushSize(mediumBrush);

    eraseBtn = (ImageButton)findViewById(R.id.erase_btn);
    eraseBtn.setOnClickListener(this);

    newBtn = (ImageButton)findViewById(R.id.new_btn);
    newBtn.setOnClickListener(this);

    saveBtn = (ImageButton)findViewById(R.id.save_btn);
    saveBtn.setOnClickListener(this);

}

public void paintClicked(View view){
    //use chosen color

    drawView.setErase(false);
    drawView.setBrushSize(drawView.getLastBrushSize());

    if(view!=currPaint){
        //update color
            ImageButton imgView = (ImageButton)view;
            String color = view.getTag().toString();

            drawView.setColor(color);

            imgView.setImageDrawable(getResources().getDrawable(R.drawable.paint_pressed));
            currPaint.setImageDrawable(getResources().getDrawable(R.drawable.paint));
            currPaint=(ImageButton)view;
        }

    }

@Override
public void onClick(View view){
//respond to clicks
    if(view.getId()==R.id.draw_btn){
        //draw button clicked
        final Dialog brushDialog = new Dialog(this);
        brushDialog.setTitle("Brush size:");

        brushDialog.setContentView(R.layout.brush_chooser);

        ImageButton smallBtn = (ImageButton)brushDialog.findViewById(R.id.small_brush);
        smallBtn.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                drawView.setBrushSize(smallBrush);
                drawView.setLastBrushSize(smallBrush);
                drawView.setErase(false);
                brushDialog.dismiss();
            }
        });

        ImageButton mediumBtn = (ImageButton)brushDialog.findViewById(R.id.medium_brush);
        mediumBtn.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                drawView.setBrushSize(mediumBrush);
                drawView.setLastBrushSize(mediumBrush);
                drawView.setErase(false);
                brushDialog.dismiss();
            }
        });

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

        brushDialog.show();
    }

    else if(view.getId()==R.id.erase_btn){
        //switch to erase - choose size
        final Dialog brushDialog = new Dialog(this);
        brushDialog.setTitle("Eraser size:");
        brushDialog.setContentView(R.layout.brush_chooser);

        ImageButton smallBtn = (ImageButton)brushDialog.findViewById(R.id.small_brush);
        smallBtn.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                drawView.setErase(true);
                drawView.setBrushSize(smallBrush);
                brushDialog.dismiss();
            }
        });
        ImageButton mediumBtn = (ImageButton)brushDialog.findViewById(R.id.medium_brush);
        mediumBtn.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                drawView.setErase(true);
                drawView.setBrushSize(mediumBrush);
                brushDialog.dismiss();
            }
        });
        ImageButton largeBtn = (ImageButton)brushDialog.findViewById(R.id.large_brush);
        largeBtn.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                drawView.setErase(true);
                drawView.setBrushSize(largeBrush);
                brushDialog.dismiss();
            }
        });

        brushDialog.show();
    }

    else if(view.getId()==R.id.new_btn){
        //new button
        AlertDialog.Builder newDialog = new AlertDialog.Builder(this);
        newDialog.setTitle("New drawing");
        newDialog.setMessage("Start new (you will lose the current one)?");
        newDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int which){
                drawView.startNew();
                dialog.dismiss();
            }
        });
        newDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int which){
                dialog.cancel();
            }
        });
        newDialog.show();
    }

    else if(view.getId()==R.id.save_btn){
        //save drawing
        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
                String imgSaved = MediaStore.Images.Media.insertImage(
                        getContentResolver(), drawView.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();
                }
            }
        });
        saveDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int which){
                dialog.cancel();
            }
        });
        saveDialog.show();

        drawView.setDrawingCacheEnabled(true);

        drawView.destroyDrawingCache();
    }

}

}
4

1 回答 1

0 
package com.example.sfo;

import java.io.File;
import java.io.FileOutputStream;
import java.util.UUID;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Color;
import android.media.MediaScannerConnection;
import android.media.MediaScannerConnection.OnScanCompletedListener;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import com.example.sof.R;

public class MainActivity extends Activity {
    private static final String TAG = "MainActivity";

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

        // get our application's root view.
        final View view = getWindow().getDecorView().findViewById(android.R.id.content);
        view.setDrawingCacheEnabled(true);
        view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);

        // read documentation.
        view.setDrawingCacheBackgroundColor(Color.WHITE);

        Button btn = (Button) findViewById(R.id.button1);
        btn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // save the whole app view
                saveView(view);
            }
        });
    }

    private void saveView(final View view) {
        String storagePath = Environment.getExternalStorageDirectory().getAbsolutePath();
        String targetDirPath = storagePath + "/myLectureImage/";

        File targetDir = new File(targetDirPath);
        if (!targetDir.exists()) {
            if (false == targetDir.mkdirs()) {
                Log.d(TAG, "Could not create dir: " + targetDirPath);
                return;
            }
        }

        String filePath = targetDirPath + UUID.randomUUID().toString() + ".png";
        File file = new File(filePath);
        Log.d(TAG, "File path: " + filePath);

        try {
            file.createNewFile();

            FileOutputStream ostream = null;
            ostream = new FileOutputStream(file);

            Bitmap bitmap = view.getDrawingCache();

            // NOTE: in production code, you should not be doing this from 
            // UI thread - as compress method will take some time for high 
            // quality images
            bitmap.compress(CompressFormat.PNG, 100, ostream);
            ostream.flush();
            ostream.close();

            // Update the new image information in media store so that it is visible in gallery app
            MediaScannerConnection.scanFile(getApplicationContext(), new String[] { filePath }, null,
                    new OnScanCompletedListener() {
                        @Override
                        public void onScanCompleted(String path, Uri uri) {
                            // careful! you can not touch views or show toast from here. This is an async task callback.
                            Log.d(TAG, "Saved: " + path);
                        }
                    });

        } catch (Exception e) {
            Toast.makeText(getApplicationContext(), "Error saving file: " + e.getMessage(), Toast.LENGTH_SHORT).show();         
        }
    }
}

activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.sfo.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="Button" />

</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.sof"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="21" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.sfo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

请注意清单中所需的权限。

于 2015-09-01T09:51:32.193 回答