在触摸时更改像素的颜色

Question

我正在努力将用户触摸的图像像素的值更改为绿色。我知道这些类型的问题已经得到解答，但我在返回或设置返回的像素并将其反映到图像时遇到了麻烦。 我从以下链接获取了代码：http://android-er.blogspot.ru/2012/10/get-touched-pixel-color-of-scaled.html 我将以下内容更改为代码，不知道我是否正确。

int touchedRGB = bitmap.getPixel(x, y);

            int r = Color.red(touchedRGB);
            int b = Color.blue(touchedRGB);
            int g = Color.green(touchedRGB);


            r = 0;
            g = 255;
            b = 0;

            bitmap.setPixel(x, y, Color.argb(Color.alpha(touchedRGB), r, g, b));

请帮我解决这个小问题。谢谢

dot java file

import android.graphics.Color;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.TextView;

public class webtest extends Activity {

    TextView touchedXY, invertedXY, imgSize, colorRGB;
    ImageView imgSource1, imgSource2;

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

        touchedXY = (TextView)findViewById(R.id.xy);
        invertedXY = (TextView)findViewById(R.id.invertedxy);
        imgSize = (TextView)findViewById(R.id.size);
        colorRGB = (TextView)findViewById(R.id.colorrgb);
        imgSource1 = (ImageView)findViewById(R.id.source1);
        imgSource2 = (ImageView)findViewById(R.id.source2);

        imgSource1.setOnTouchListener(imgSourceOnTouchListener);
        imgSource2.setOnTouchListener(imgSourceOnTouchListener);

    }

    OnTouchListener imgSourceOnTouchListener
            = new OnTouchListener(){

        @Override
        public boolean onTouch(View view, MotionEvent event) {

            float eventX = event.getX();
            float eventY = event.getY();
            float[] eventXY = new float[] {eventX, eventY};

            Matrix invertMatrix = new Matrix();
            ((ImageView)view).getImageMatrix().invert(invertMatrix);

            invertMatrix.mapPoints(eventXY);
            int x = Integer.valueOf((int)eventXY[0]);
            int y = Integer.valueOf((int)eventXY[1]);

            touchedXY.setText(
                    "touched position: "
                            + String.valueOf(eventX) + " / "
                            + String.valueOf(eventY));
            invertedXY.setText(
                    "touched position: "
                            + String.valueOf(x) + " / "
                            + String.valueOf(y));

            Drawable imgDrawable = ((ImageView)view).getDrawable();
            Bitmap bitmap = ((BitmapDrawable)imgDrawable).getBitmap();

            imgSize.setText(
                    "drawable size: "
                            + String.valueOf(bitmap.getWidth()) + " / "
                            + String.valueOf(bitmap.getHeight()));

            //Limit x, y range within bitmap
            if(x < 0){
                x = 0;
            }else if(x > bitmap.getWidth()-1){
                x = bitmap.getWidth()-1;
            }

            if(y < 0){
                y = 0;
            }else if(y > bitmap.getHeight()-1){
                y = bitmap.getHeight()-1;
            }

            int touchedRGB = bitmap.getPixel(x, y);

            int r = Color.red(touchedRGB);
            int b = Color.blue(touchedRGB);
            int g = Color.green(touchedRGB);


            r =0;
            g = 255;
            b = 0;

            bitmap.setPixel(x, y, Color.argb(Color.alpha(touchedRGB), r, g, b));



            colorRGB.setText("touched color: " + "#" + Integer.toHexString(touchedRGB));
            colorRGB.setTextColor(touchedRGB);

            return true;
        }};

xml layout

<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:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
    <TextView
        android:id="@+id/xy"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="touched position: "/>
    <TextView
        android:id="@+id/invertedxy"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="inverted touched position: "/>
    <TextView
        android:id="@+id/size"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="drawable size: "/>
    <TextView
        android:id="@+id/colorrgb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="touched color: "/>
    <ImageView
        android:id="@+id/source1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/im1"/>
    <ImageView
        android:id="@+id/source2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/im5"/>

</LinearLayout>

这里是logcat

 at android.graphics.Bitmap.setPixel(Bitmap.java:1425)
            at com.example.rohit2906.webtest.webtest$1.onTouch(webtest.java:96)
            at android.view.View.dispatchTouchEvent(View.java:8382)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2314)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1692)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2739)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2275)
            at android.view.View.dispatchPointerEvent(View.java:8578)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4021)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3887)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3578)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3635)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5701)
            at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5675)
            at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5646)
            at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5791)
            at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
            at android.os.MessageQueue.nativePollOnce(Native Method)
            at android.os.MessageQueue.next(MessageQueue.java:143)
            at android.os.Looper.loop(Looper.java:122)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-25 22:18:43.235    1910-1910/com.example.rohit2906.webtest D/AndroidRuntime﹕ Shutting down VM
    --------- beginning of crash
03-25 22:18:43.236    1910-1910/com.example.rohit2906.webtest E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.rohit2906.webtest, PID: 1910
    java.lang.IllegalStateException
            at android.graphics.Bitmap.setPixel(Bitmap.java:1425)
            at com.example.rohit2906.webtest.webtest$1.onTouch(webtest.java:96)
            at android.view.View.dispatchTouchEvent(View.java:8382)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2314)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1692)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2739)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2275)
            at android.view.View.dispatchPointerEvent(View.java:8578)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4021)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3887)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3578)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3635)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5701)
            at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5675)
            at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5646)
            at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5791)
            at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
            at android.os.MessageQueue.nativePollOnce(Native Method)
            at android.os.MessageQueue.next(MessageQueue.java:143)
            at android.os.Looper.loop(Looper.java:122)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

实际上答案包括使位图变得可变但是在这里即使我的位图不可变，我也在问我们是否有任何其他方法可以将我的位图设置为改变颜色的Pixel。 这是代码的logcat。

java.lang.IllegalStateException
            at android.graphics.Bitmap.setPixel(Bitmap.java:1394)
            at com.example.rohit2906.webtest.webtest$1.onTouch(webtest.java:108)
            at android.view.View.dispatchTouchEvent(View.java:7706)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
            at android.view.View.dispatchPointerEvent(View.java:7891)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602)
            at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582)
            at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553)
            at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682)
            at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
            at android.os.MessageQueue.nativePollOnce(Native Method)
            at android.os.MessageQueue.next(MessageQueue.java:138)
            at android.os.Looper.loop(Looper.java:123)
            at android.app.ActivityThread.main(ActivityThread.java:5021)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
            at dalvik.system.NativeStart.main(Native Method)

Answer 1

试用此代码：

此代码更改TextView的颜色。根据您的要求修改它......

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Environment;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.TextView;

public class webtest extends Activity {

    TextView touchedXY, invertedXY, imgSize, colorRGB;
    ImageView imgSource1, imgSource2;

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

        touchedXY = (TextView)findViewById(R.id.xy);
        invertedXY = (TextView)findViewById(R.id.invertedxy);
        imgSize = (TextView)findViewById(R.id.size);
        colorRGB = (TextView)findViewById(R.id.colorrgb);
        imgSource1 = (ImageView)findViewById(R.id.source1);
        imgSource2 = (ImageView)findViewById(R.id.source2);

        imgSource1.setOnTouchListener(imgSourceOnTouchListener);
        imgSource2.setOnTouchListener(imgSourceOnTouchListener);

    }

    OnTouchListener imgSourceOnTouchListener= new OnTouchListener(){

        @Override
        public boolean onTouch(View view, MotionEvent event) {

            float eventX = event.getX();
            float eventY = event.getY();
            float[] eventXY = new float[] {eventX, eventY};

            Matrix invertMatrix = new Matrix();
            ((ImageView)view).getImageMatrix().invert(invertMatrix);

            invertMatrix.mapPoints(eventXY);
            int x = Integer.valueOf((int)eventXY[0]);
            int y = Integer.valueOf((int)eventXY[1]);

            touchedXY.setText(
                    "touched position: "
                            + String.valueOf(eventX) + " / "
                            + String.valueOf(eventY));
            invertedXY.setText(
                    "touched position: "
                            + String.valueOf(x) + " / "
                            + String.valueOf(y));

            Drawable imgDrawable = ((ImageView)view).getDrawable();
            Bitmap bitmap = ((BitmapDrawable)imgDrawable).getBitmap();

            imgSize.setText(
                    "drawable size: "
                            + String.valueOf(bitmap.getWidth()) + " / "
                            + String.valueOf(bitmap.getHeight()));

            //Limit x, y range within bitmap
            if(x < 0){
                x = 0;
            }else if(x > bitmap.getWidth()-1){
                x = bitmap.getWidth()-1;
            }

            if(y < 0){
                y = 0;
            }else if(y > bitmap.getHeight()-1){
                y = bitmap.getHeight()-1;
            }

            //if(!bitmap.isRecycled())
            {
                int touchedRGB = bitmap.getPixel(x, y);

                int r = Color.red(touchedRGB);
                int b = Color.blue(touchedRGB);
                int g = Color.green(touchedRGB);


                r =0;
                g = 255;
                b = 0;

                Bitmap newbitmap = convertToMutable(bitmap);
                newbitmap.setPixel(x, y, Color.argb(Color.alpha(touchedRGB), r, g, b));

                colorRGB.setText("touched color: " + "#" + Integer.toHexString(touchedRGB));
                colorRGB.setTextColor(touchedRGB);
            }

            return true;
        }};


        public static Bitmap convertToMutable(Bitmap imgIn) {
            try {
                //this is the file going to use temporally to save the bytes. 
                // This file will not be a image, it will store the raw image data.
                File file = new File(Environment.getExternalStorageDirectory() + File.separator + "temp.tmp");

                //Open an RandomAccessFile
                //Make sure you have added uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
                //into AndroidManifest.xml file
                RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");

                // get the width and height of the source bitmap.
                int width = imgIn.getWidth();
                int height = imgIn.getHeight();
                Config type = imgIn.getConfig();

                //Copy the byte to the file
                //Assume source bitmap loaded using options.inPreferredConfig = Config.ARGB_8888;
                FileChannel channel = randomAccessFile.getChannel();
                MappedByteBuffer map = channel.map(MapMode.READ_WRITE, 0, imgIn.getRowBytes()*height);
                imgIn.copyPixelsToBuffer(map);
                //recycle the source bitmap, this will be no longer used.
                //imgIn.recycle();
                System.gc();// try to force the bytes from the imgIn to be released

                //Create a new bitmap to load the bitmap again. Probably the memory will be available. 
                imgIn = Bitmap.createBitmap(width, height, type);
                map.position(0);
                //load it back from temporary 
                imgIn.copyPixelsFromBuffer(map);
                //close the temporary file and channel , then delete that also
                channel.close();
                randomAccessFile.close();

                // delete the temp file
                file.delete();

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } 

            return imgIn;
        }
}