Question

我遇到了问题，我现在被困了很长时间，我希望你们能帮助我。我得到了一段代码，我可以打开图像，改变饱和度（使用搜索栏）。然后我想保存更改的图像。但是最后一部分不能正常运作。

使用此代码，我可以更改饱和度，然后保存更改的位图，但它会保存具有ImageView（480 x 517）大小的位图，但是他确实应用了饱和度更改（这很好）

ColorMatrix cm = new ColorMatrix();

System.out.println(progress2);
cm.setSaturation(progress2);
ColorFilter = new ColorMatrixColorFilter(cm);
bitmap_image = BitmapFactory.decodeFile(filePath);
ImageView img = (ImageView) findViewById(R.id.gallery1);
img.setColorFilter(ColorFilter);
img.setImageBitmap(bitmap_image);
img.buildDrawingCache(true);
img.setDrawingCacheEnabled(true);
Bitmap b = img.getDrawingCache();


Bitmap resizedBitmap = Bitmap.createBitmap(bitmap_image, 0, 0, 3264, 2448);
File file = new File(sdcard+"/DCIM/Camera/image3.jpg");
try {
    file.createNewFile();
    FileOutputStream ostream = new FileOutputStream(file);
    **b.compress(CompressFormat.JPEG, 100, ostream);**
    ostream.close();
} catch (Exception e) 
            {
            System.out.println("WRITING HAS FAILED");
            e.printStackTrace();
            }

接下来的代码，我也可以改变饱和度，但是当我保存位图时，它会保存原始高度和宽度（3264 x 2448）的位图，但它不会保存饱和度变化。

   ColorMatrix cm = new ColorMatrix();

System.out.println(progress2);
cm.setSaturation(progress2);
ColorFilter = new ColorMatrixColorFilter(cm);
bitmap_image = BitmapFactory.decodeFile(filePath);
ImageView img = (ImageView) findViewById(R.id.gallery1);
img.setColorFilter(ColorFilter);
img.setImageBitmap(bitmap_image);
img.buildDrawingCache(true);
img.setDrawingCacheEnabled(true);
Bitmap b = img.getDrawingCache();


Bitmap resizedBitmap = Bitmap.createBitmap(bitmap_image, 0, 0, 3264, 2448);
File file = new File(sdcard+"/DCIM/Camera/image3.jpg");
try {
    file.createNewFile();
    FileOutputStream ostream = new FileOutputStream(file);
    **resizedBitmap.compress(CompressFormat.JPEG, 100, ostream);**
    ostream.close();
    } catch (Exception e) 
        {
        System.out.println("WRITING HAS FAILED");
        e.printStackTrace();
        }

但我需要的是它保存饱和度变化（代码1）并保持原始宽度 - 高度（代码2），但不知怎的，我似乎没有让这两个代码一起工作。

请把我放在好方向。代码可能是一团糟，尝试了很多东西，结构也没有变得更好。

**code** that is the line that changed.

编辑：当我这样做时:( Ricki的建议）

Bitmap resizedBitmap = Bitmap.createBitmap(b, 0, 0, 3264, 2448);

我收到此错误日志：

03-09 15:03:02.880: E/AndroidRuntime(847): FATAL EXCEPTION: main
03-09 15:03:02.880: E/AndroidRuntime(847): java.lang.NullPointerException
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.graphics.Bitmap.createBitmap(Bitmap.java:409)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.graphics.Bitmap.createBitmap(Bitmap.java:383)
03-09 15:03:02.880: E/AndroidRuntime(847):  at com.dlv.groenmeter.GroenMeterActivity$13.onStopTrackingTouch(GroenMeterActivity.java:937)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.widget.SeekBar.onStopTrackingTouch(SeekBar.java:115)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.widget.AbsSeekBar.onTouchEvent(AbsSeekBar.java:303)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.view.View.dispatchTouchEvent(View.java:3938)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-09 15:03:02.880: E/AndroidRuntime(847):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1730)
03-09 15:03:02.880: E/AndroidRuntime(847):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1142)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.app.Activity.dispatchTouchEvent(Activity.java:2102)
03-09 15:03:02.880: E/AndroidRuntime(847):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1714)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2218)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1889)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.os.Handler.dispatchMessage(Handler.java:99)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.os.Looper.loop(Looper.java:123)
03-09 15:03:02.880: E/AndroidRuntime(847):  at android.app.ActivityThread.main(ActivityThread.java:3691)
03-09 15:03:02.880: E/AndroidRuntime(847):  at java.lang.reflect.Method.invokeNative(Native Method)
03-09 15:03:02.880: E/AndroidRuntime(847):  at java.lang.reflect.Method.invoke(Method.java:507)
03-09 15:03:02.880: E/AndroidRuntime(847):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
03-09 15:03:02.880: E/AndroidRuntime(847):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
03-09 15:03:02.880: E/AndroidRuntime(847):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

第二个代码有两个问题：

<强> 1）您的饱和图片为b，因此应创建resizedBitmap，如下所示：

Bitmap resizedBitmap = Bitmap.createBitmap(b, 0, 0, 3264, 2448);

<强> 2）您在构建后启用DrawingCache：

img.buildDrawingCache(true);
img.setDrawingCacheEnabled(true);

它应该是相反的顺序：

img.setDrawingCacheEnabled(true);
img.buildDrawingCache(true);

修改

尝试使用此代码设置饱和度：

Bitmap bmp = BitmapFactory.decodeFile(filePath); Bitmap alteredBitmap = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig()); Canvas canvas = new Canvas(alteredBitmap); Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(progress2); paint.setColorFilter(new ColorMatrixColorFilter(cm)); Matrix matrix = new Matrix(); canvas.drawBitmap(bmp, matrix, paint); Bitmap resizedBitmap = Bitmap.createBitmap(alteredBitmap, 0, 0, 3264, 2448); File file = new File(sdcard+"/DCIM/Camera/image3.jpg"); try { file.createNewFile(); FileOutputStream ostream = new FileOutputStream(file); resizedBitmap.compress(CompressFormat.JPEG, 100, ostream); ostream.close(); } catch (Exception e) { System.out.println("WRITING HAS FAILED"); e.printStackTrace(); }

Answer 2

从我所看到的变量'b'包含饱和图像。看起来你应该更改行

Bitmap resizedBitmap = Bitmap.createBitmap(bitmap_image, 0, 0, 3264, 2448);

要：

Bitmap resizedBitmap = Bitmap.createBitmap(b, 0, 0, 3264, 2448);

这对你有用吗？

无法保存更改位图（更改饱和度）

2 个答案: