Android 从intent在gridView中设置字节数组

我在这里设置了一个复选框的onClick侦听器：

@Override
                public void onClick(View v) {
                    if (addCheckbox.isChecked()) {
                        System.out.println("Checked");
                        PackageManager pm = mContext.getPackageManager();
                        Drawable icon = null;
                        try {
                            icon = pm
                            .getApplicationIcon(entry.activityInfo.packageName);
                        } catch (NameNotFoundException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        Drawable default_icon = pm.getDefaultActivityIcon();
                        if (icon instanceof BitmapDrawable
                                && default_icon instanceof BitmapDrawable) {
                            BitmapDrawable icon_bd = (BitmapDrawable) icon;
                            Bitmap icon_b = icon_bd.getBitmap();
                            BitmapDrawable default_bd = (BitmapDrawable) pm
                                    .getDefaultActivityIcon();
                            Bitmap default_b = default_bd.getBitmap();
                            if (icon_b == default_b) {
                                // It's the default icon
                                scaleDownBitmap(default_b, 100, v.getContext());
                                Log.d("AppInfoAdapter", "Scale Bitmap Chosen");

                                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                                default_b.compress(Bitmap.CompressFormat.PNG, 100, stream);
                                byte[] byteArray = stream.toByteArray();
                                Log.d("AppInfoAdapter", "Scale Bitmap to Array");

                                Intent intent = new Intent(v.getContext(), Drag_and_Drop_App.class);
                                intent.putExtra("picture", byteArray);
                                v.getContext().startActivity(intent);
                                Log.d("AppInfoAdapter", "Intent started to send Bitmap");
                            }
                        }
                    } else {
                        System.out.println("Un-Checked");
                    }

                }
            });

我正在尝试将此处的意图（包含位图）发送到此处的我的gridView（这是gridView适配器）：

但是，我无法将该位图默认值添加到我的gridView中

我该怎么做

更新编码：

                    @Override
                public void onClick(View v) {
                    if (addCheckbox.isChecked()) {
                        System.out.println("Checked");
                        PackageManager pm = mContext.getPackageManager();
                        Drawable icon = null;
                        try {
                            icon = pm
                            .getApplicationIcon(entry.activityInfo.packageName);
                        } catch (NameNotFoundException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        Drawable default_icon = pm.getDefaultActivityIcon();
                        if (icon instanceof BitmapDrawable
                                && default_icon instanceof BitmapDrawable) {
                            BitmapDrawable icon_bd = (BitmapDrawable) icon;
                            Bitmap icon_b = icon_bd.getBitmap();
                            BitmapDrawable default_bd = (BitmapDrawable) pm
                                    .getDefaultActivityIcon();
                            Bitmap default_b = default_bd.getBitmap();
                            if (icon_b == default_b) {
                                // It's the default icon
                                scaleDownBitmap(default_b, 100, v.getContext());
                                Log.d("AppInfoAdapter", "Scale Bitmap Chosen");

                                SaveImage(default_b);

                                Intent intent = new Intent(v.getContext(),Drag_and_Drop_App.class);
                                intent.putExtra("picture", fname);
                                v.getContext().startActivity(intent);
                                Log.d("AppInfoAdapter", "Intent started to send Bitmap");

                            }
                        }
                    } else {
                        System.out.println("Un-Checked");
                    }

                }
            });

    // return view
    return v;
}

下面是课堂：

    public void SaveImage(Bitmap default_b) {

    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/saved_images");
    myDir.mkdirs();
    Random generator = new Random();
    int n = 100000;
    n = generator.nextInt(n);
    String fname = "Image-" + n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists()) file.delete();
    try {
        FileOutputStream out = new FileOutputStream(file);
        default_b.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

---

您不应该将字节数组传递给intent。意图捆绑包在活动之间发送时具有最大大小，而且在序列化和反序列化时可能会使应用程序陷入困境

另请参见描述您的确切问题，并注意该问题以“按预期工作”结束。用罗曼·盖伊的话说：

通过意图传递大量数据的成本非常高。你不应该使用 意图作为位图的传输机制。相反，传递URI或任何其他信息 位置机制（文件路径等）

---

我敦促您将映像写入缓存目录，并从其他活动异步读取。

如何将映像写入缓存目录？另外，如何在gridView适配器中读取缓存目录，以便在gridView中使用它？在查看缓存目录后，它似乎只针对来自internet的带有URL的图像？如果我错了或弄错了，请告诉我，因为我是新手。如果您已经有了从URI读取图像的机制，您只需使用本地URI（

文件：//

，后跟缓存图像的绝对路径）即可加载它。至于写图像，你可以举个例子。好吧……那么基本上我会改变我的编码，使用一个文件输出流，而不是byteArray流？另外，我没有任何东西可以从URI读取图像，那么我应该如何从FileOutput流获取图像，以便在gridView中使用它呢？请注意，我使用的是我在上面的onClick方法中制作的位图

                    @Override
                public void onClick(View v) {
                    if (addCheckbox.isChecked()) {
                        System.out.println("Checked");
                        PackageManager pm = mContext.getPackageManager();
                        Drawable icon = null;
                        try {
                            icon = pm
                            .getApplicationIcon(entry.activityInfo.packageName);
                        } catch (NameNotFoundException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        Drawable default_icon = pm.getDefaultActivityIcon();
                        if (icon instanceof BitmapDrawable
                                && default_icon instanceof BitmapDrawable) {
                            BitmapDrawable icon_bd = (BitmapDrawable) icon;
                            Bitmap icon_b = icon_bd.getBitmap();
                            BitmapDrawable default_bd = (BitmapDrawable) pm
                                    .getDefaultActivityIcon();
                            Bitmap default_b = default_bd.getBitmap();
                            if (icon_b == default_b) {
                                // It's the default icon
                                scaleDownBitmap(default_b, 100, v.getContext());
                                Log.d("AppInfoAdapter", "Scale Bitmap Chosen");

                                SaveImage(default_b);

                                Intent intent = new Intent(v.getContext(),Drag_and_Drop_App.class);
                                intent.putExtra("picture", fname);
                                v.getContext().startActivity(intent);
                                Log.d("AppInfoAdapter", "Intent started to send Bitmap");

                            }
                        }
                    } else {
                        System.out.println("Un-Checked");
                    }

                }
            });

    // return view
    return v;
}

    public void SaveImage(Bitmap default_b) {

    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/saved_images");
    myDir.mkdirs();
    Random generator = new Random();
    int n = 100000;
    n = generator.nextInt(n);
    String fname = "Image-" + n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists()) file.delete();
    try {
        FileOutputStream out = new FileOutputStream(file);
        default_b.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}