在两个活动之间传递位图

Question

我正在开发一个绘画应用程序，我想在其中将Bitmap图像从一个活动传递到另一个活动，但项目没有响应。我将相对布局截图转换为位图并将其传递给Intent但问题仍未解决。这是我的代码......

DrawingActivity

package com.newdrawing;
public class DrawingActivity extends Activity {
    private Bitmap  mBitmap;
    private Canvas  mCanvas;
    private Path    mPath;
    private Paint   mBitmapPaint;
    private Paint   mPaint;
    MyDrawView myDrawView;
    RelativeLayout parent;
    Bitmap bitmap;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_drawing);

        parent = (RelativeLayout) findViewById(R.id.singleparent);
        myDrawView = new MyDrawView(this);
        parent.addView(myDrawView);
        Activity context;
        //RelativeLayout item = (RelativeLayout)findViewById(R.id.item);
        View child = getLayoutInflater().inflate(R.layout.trans, null);
        parent.addView(child);   
   }

   public void color(View v) {
       switch (v.getId()) {
        case R.id.button3:
           parent.setBackgroundColor(Color.RED);
            break;
        case R.id.button4:
             parent.setBackgroundColor(Color.GREEN);
            break;
        case R.id.button5:
             parent.setBackgroundColor(Color.BLUE);
            break;
        }
    }
    public void save(View v) {
     parent.setDrawingCacheEnabled(true);
     bitmap=parent.getDrawingCache();
     parent.setDrawingCacheEnabled(false);
       Log.e("Bitmap",String.valueOf(bitmap));

    // send();

    //Canvas c = new Canvas(bitmap);
    //.draw(c);
    // File outputFile; // Where to save it
     //FileOutputStream out = new FileOutputStream(imageFile);
    // boolean success = bitmap.compress(CompressFormat.PNG, 100, out);
    // out.close();

    Intent i = new Intent(this, ImageActivity.class);
       ByteArrayOutputStream bs = new ByteArrayOutputStream();
     bitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);
     byte[] byteArray = bs.toByteArray();
     i.putExtra("byteArray", byteArray);
     startActivity(i);
 }

 private void send()
 {
    Intent i9=new Intent(DrawingActivity.this,ImageActivity.class);
    i9.putExtra("Image",bitmap);
    startActivity(i9);
 }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_drawing, menu);
        return true;
    }
    public class MyDrawView extends View {

        public MyDrawView(Context c) {
            super(c);

            mPath = new Path();
            mBitmapPaint = new Paint(Paint.DITHER_FLAG);

            mPaint = new Paint();
            mPaint.setAntiAlias(true);
            mPaint.setDither(true);
            mPaint.setColor(0xFF000000);
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setStrokeJoin(Paint.Join.ROUND);
            mPaint.setStrokeCap(Paint.Cap.ROUND);
            mPaint.setStrokeWidth(3);
        }

        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);
            mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
            mCanvas = new Canvas(mBitmap);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
            canvas.drawColor(Color.TRANSPARENT);

            canvas.drawPath(mPath, mPaint);
        }

        private float mX, mY;
        private static final float TOUCH_TOLERANCE = 4;

        private void touch_start(float x, float y) {
            mPath.reset();
            mPath.moveTo(x, y);
            mX = x;
            mY = y;
        }
        private void touch_move(float x, float y) {
            float dx = Math.abs(x - mX);
            float dy = Math.abs(y - mY);
            if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
                mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
                mX = x;
                mY = y;
            }
        }
        private void touch_up() {
            mPath.lineTo(mX, mY);
            // commit the path to our offscreen
            mCanvas.drawPath(mPath, mPaint);
            // kill this so we don't double draw
            mPath.reset();
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            float x = event.getX();
            float y = event.getY();

            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    touch_start(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_MOVE:
                    touch_move(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_UP:
                    touch_up();
                    invalidate();
                    break;
            }
            return true;
        }

        public void clear(){
            mBitmap.eraseColor(Color.TRANSPARENT);
            invalidate();
            System.gc();
        }
    }
}

ImageActivity

package com.newdrawing;
public class ImageActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image);
        Intent i =  getIntent();

        ImageView img=(ImageView)findViewById(R.id.image11);
     /*
       if(getIntent().hasExtra("byteArray")) 
       {

           Bitmap b = BitmapFactory.decodeByteArray(
                getIntent().getByteArrayExtra("byteArray"),0,getIntent().getByteArrayExtra("byteArray").length);        
          img.setImageBitmap(b);
           Log.e("Bitmap",String.valueOf(b));

       }*/

       Bundle extras = getIntent().getExtras();
       byte[] byteArray = extras.getByteArray("byteArray");

       Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
       img.setImageBitmap(bmp);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_image, menu);
        return true;
    }
 }

地点报告

10-16 10:39:22.653: E/AndroidRuntime(339): FATAL EXCEPTION: main
10-16 10:39:22.653: E/AndroidRuntime(339): java.lang.IllegalStateException: Could not execute method of the activity
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.view.View$1.onClick(View.java:2072)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.view.View.performClick(View.java:2408)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.view.View$PerformClick.run(View.java:8816)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.os.Handler.handleCallback(Handler.java:587)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.os.Handler.dispatchMessage(Handler.java:92)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.os.Looper.loop(Looper.java:123)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.app.ActivityThread.main(ActivityThread.java:4627)
10-16 10:39:22.653: E/AndroidRuntime(339):  at java.lang.reflect.Method.invokeNative(Native Method)
10-16 10:39:22.653: E/AndroidRuntime(339):  at java.lang.reflect.Method.invoke(Method.java:521)
10-16 10:39:22.653: E/AndroidRuntime(339):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-16 10:39:22.653: E/AndroidRuntime(339):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-16 10:39:22.653: E/AndroidRuntime(339):  at dalvik.system.NativeStart.main(Native Method)
10-16 10:39:22.653: E/AndroidRuntime(339): Caused by: java.lang.reflect.InvocationTargetException
10-16 10:39:22.653: E/AndroidRuntime(339):  at com.newdrawing.DrawingActivity.save(DrawingActivity.java:91)
10-16 10:39:22.653: E/AndroidRuntime(339):  at java.lang.reflect.Method.invokeNative(Native Method)
10-16 10:39:22.653: E/AndroidRuntime(339):  at java.lang.reflect.Method.invoke(Method.java:521)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.view.View$1.onClick(View.java:2067)
10-16 10:39:22.653: E/AndroidRuntime(339):  ... 11 more
10-16 10:39:22.653: E/AndroidRuntime(339): Caused by: java.lang.IllegalStateException: Can't compress a recycled bitmap
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.graphics.Bitmap.checkRecycled(Bitmap.java:180)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.graphics.Bitmap.compress(Bitmap.java:572)
10-16 10:39:22.653: E/AndroidRuntime(339):  ... 15 more

Answer 1

您可以尝试使用以下 -

Intent i = new Intent(this, Second.class)
i.putExtra("Image", bitmap);
startActivity(i)

而且，在Second.class

中

Bitmap bitmap = (Bitmap) intent.getParcelableExtra("Image");

查看here如果您想在发送到下一个活动之前压缩Bitmap，请查看下方 -

Intent i = new Intent(this, NextActivity.class);
Bitmap b; // your bitmap
ByteArrayOutputStream bs = new ByteArrayOutputStream();
b.compress(Bitmap.CompressFormat.PNG, 50, bs);
i.putExtra("byteArray", bs.toByteArray());
startActivity(i);

你的下一个活动 -

if(getIntent().hasExtra("byteArray")) {
    ImageView previewThumbnail = new ImageView(this);
    Bitmap b = BitmapFactory.decodeByteArray(
                    getIntent().getByteArrayExtra("byteArray"),0,getIntent()
                    .getByteArrayExtra("byteArray").length);        
    previewThumbnail.setImageBitmap(b);
}

Answer 2

我在this SO帖子中回答了类似的问题。我的解决方案会将图像保存在其他应用程序无法访问的设备的内部存储中（在未经根据的手机上）。然后我们可以简单地解码文件并在imageview中显示它。它可以防止 TranscationTooLarge 异常，因为你不能超过传递包的1mb限制。

Answer 3

我认为在大多数情况下，将位图放在静态引用上是可以的，当接收活动不再需要它时，该引用应该为空。

这样，它非常快，不需要转换，编码和解码。它也不会留下痕迹。

Answer 4

有很多方法：

<强> 1）

Bitmap实现了Parcelable，因此你总是可以在意图中传递它：

Intent intent = new Intent(this, NewActivity.class);
intent.putExtra("BitmapImage", bitmap);

并在另一端检索它：

Intent intent = getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("BitmapImage");

<强> 2）

在将其添加到intent，将其发送并解码之前将其转换为Byte数组。

//转换为字节数组

ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();

Intent in1 = new Intent(this, Activity2.class);
in1.putExtra("image",byteArray);

然后在活动2中

byte[] byteArray = getIntent().getByteArrayExtra("image");
Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);

Answer 5

如果你的图像是静态的并且在可绘制文件夹中等等，那么将位图从意图发送到下一个活动非常昂贵（For Machine :)）所以现在最好的方法是首先在{{1}中创建string-array } 像这儿。

strings.xml

然后在您的活动中获取与上面声明的数组<resources> <string name="app_name">Gallery App</string> <string-array name="images"> <item>@drawable/img1</item> <item>@drawable/img2</item> <item>@drawable/img3</item> <item>@drawable/img4</item> <item>@drawable/img5</item> <item>@drawable/img6</item> </string-array> </resources> 相关的图像列表。

1：-Declare images

的实例

2：-Assign TypeArray typeArray

3：-Declare您的列表并逐个添加每个项目 - ＆gt;

typeArray = getResources().obtainTypedArray(R.array.images);

4： - 当然，现在您将在 ArrayList list = new ArrayList(); for (int i = 0 ;i< typedArray.length() ; i++){ Bitmap bitmap = BitmapFactory.decodeResource(getResources(),typedArray.getResourceId(i ,-1)); list.add(bitmap); }

中设置此列表

ArrayAdapter

5： - 发送bitmapimage到你的下一个活动

view.setAdapter(new ArrayAdapter(this , R.layout.viewImages , list));

6： - 确认您的位图ID并获取您的位图图像

 view.setOnItemClickedListener(new AdapterView.OnItemClickedListener(){


            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    Intent i = new Intent(MainActivity.this , DetailedImageActivity.class);
                    int imageId = typedArray.getResourceId(position , -1);
                    i.putExtra("imageId",imageId) ;
                    Log.i("ResourceId ","here");
                    startActivity(i);


            }

    });

Answer 6

您可以使用bundle将位图从一个活动传递到另一个活动

将图像添加到字节数组中：

ArrayList<byte[]> image=new ArrayList<byte[]>();

Bundle b = new Bundle();
Intent it=new Intent(getBaseContext(),your.class);
b.putByteArray("image", image.get(position));
it.putExtras(b);
startActivity(it);

通过捆绑

创建接收器活动来获取您的图像

Answer 7

在你的logcat中声明

10-16 10:39:22.653: E/AndroidRuntime(339): Caused by: java.lang.IllegalStateException: Can't compress a recycled bitmap
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.graphics.Bitmap.checkRecycled(Bitmap.java:180)
10-16 10:39:22.653: E/AndroidRuntime(339):  at android.graphics.Bitmap.compress(Bitmap.java:572)

您的位图在传递给ImageActivity之前已被回收。您可以将位图设置为静态，以便它不会被回收。

Answer 8

我正在寻找它，最后在https://eazyprogramming.blogspot.com/2013/01/passing-image-between-activities.html#comment-form

中找到答案 第一个活动中的

console.log(parseFloat("123hello world")); // 123
console.log(+"123hello world"); // NaN

in Second Acticity：

Intent intent=new Intent(FirstClass.this, SecondClass.class);
Bundle bundle=new Bundle();
bundle.putInt("image",R.drawable.ic_launcher);
intent.putExtras(bundle);
startActivity(intent);

另一种方法： 在第一项活动中：

Bundle bundle=this.getIntent().getExtras();
int pic=bundle.getInt("image");
v.setImageResource(pic);

in Second Acticity：

Bundle extras = getIntent().getExtras();
byte[] b = extras.getByteArray("picture");
Bitmap bmp = BitmapFactory.decodeByteArray(b, 0, b.length);
ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageBitmap(bmp);