我陷入困境，无论我对编码做什么，我都会遇到同样的问题。 在我的应用程序中，当用户打开它时，会在gridView上创建一个带有图像和滑动抽屉的gridView。在滑动抽屉中是每个listview项目的所有用户安装程序的listView：
<ImageView
android:id="@+id/ivIcon"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_marginRight="5dip"
android:scaleType="center"
android:contentDescription="@string/desc"
/>
<LinearLayout
android:orientation="vertical"
android:layout_width="0dip"
android:layout_height="fill_parent"
android:layout_weight="1"
>
<TextView
android:id="@+id/tvName"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:gravity="center_vertical"
/>
<TextView
android:id="@+id/tvPack"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:singleLine="true"
android:ellipsize="marquee"
/>
</LinearLayout>
<CheckBox
android:id="@+id/addCheckbox"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="0.3"
android:gravity="center_vertical"
android:focusable="false"
/>
应该发生的是，当选中该复选框时，它会从listView项中获取图标，将其转换为位图，将该位图保存到内部存储，从内部存储获取该位图，然后填充gridView与那个图像。这一切都发生在我的两个适配器中，用于listView和gridView。这是listView的适配器：
package com.example.awesomefilebuilderwidget;
IMPORTS
public class AppInfoAdapter extends BaseAdapter {
private Context mContext;
private List<ResolveInfo> mListAppInfo;
private PackageManager mPackManager;
private List<ResolveInfo> originalListAppInfo;
private Filter filter;
private String fname;
public AppInfoAdapter(Context c, List<ResolveInfo> listApp,
PackageManager pm) {
mContext = c;
this.originalListAppInfo = this.mListAppInfo = listApp;
mPackManager = pm;
Log.d("AppInfoAdapter", "top");
}
@Override
public int getCount() {
Log.d("AppInfoAdapter", "getCount()");
return mListAppInfo.size();
}
@Override
public Object getItem(int position) {
Log.d("AppInfoAdapter", "getItem");
return mListAppInfo.get(position);
}
@Override
public long getItemId(int position) {
Log.d("AppInfoAdapter", "getItemId");
return position;
}
public static Bitmap scaleDownBitmap(Bitmap default_b, int newHeight, Context c) {
final float densityMultiplier = c.getResources().getDisplayMetrics().density;
int h= (int) (100*densityMultiplier);
int w= (int) (h * default_b.getWidth()/((double) default_b.getHeight()));
default_b=Bitmap.createScaledBitmap(default_b, w, h, true);
// TO SOLVE LOOK AT HERE:http://stackoverflow.com/questions/15517176/passing-bitmap-to-other-activity-getting-message-on-logcat-failed-binder-transac
return default_b;
}
public final static String APP_PATH_SD_CARD = "/TEST/";
public final static String APP_THUMBNAIL_PATH_SD_CARD = "thumbnails";
public boolean saveImageToExternalStorage(Bitmap default_b) {
String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + APP_PATH_SD_CARD + APP_THUMBNAIL_PATH_SD_CARD;
try {
File dir = new File(fullPath);
if (!dir.exists()) {
dir.mkdirs();
Log.i("AIA", "Directory created");
}
OutputStream fOut = null;
File file = new File(fullPath, "AFBWIcon.png");
file.createNewFile();
fOut = new FileOutputStream(file);
// 100 means no compression, the lower you go, the stronger the compression
default_b.compress(Bitmap.CompressFormat.PNG, 100, fOut);
fOut.flush();
fOut.close();
Log.i("AIA", "Icon sent on FOS");
MediaStore.Images.Media.insertImage(mContext.getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName());
return true;
} catch (Exception e) {
Log.e("saveToExternalStorage()", e.getMessage());
return false;
}
}
public boolean saveImageToInternalStorage(Bitmap default_b) {
try {
// Use the compress method on the Bitmap object to write image to
// the OutputStream
FileOutputStream fos = mContext.openFileOutput("desiredFilename.png", Context.MODE_PRIVATE);
// Writing the bitmap to the output stream
default_b.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
return true;
} catch (Exception e) {
Log.e("saveToInternalStorage()", e.getMessage());
return false;
}
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// get the selected entry
final ResolveInfo entry = (ResolveInfo) mListAppInfo.get(position);
// reference to convertView
View v = convertView;
// inflate new layout if null
if (v == null) {
LayoutInflater inflater = LayoutInflater.from(mContext);
v = inflater.inflate(R.layout.layout_appinfo, null);
Log.d("AppInfoAdapter", "New layout inflated");
}
// load controls from layout resources
ImageView ivAppIcon = (ImageView) v.findViewById(R.id.ivIcon);
TextView tvAppName = (TextView) v.findViewById(R.id.tvName);
TextView tvPkgName = (TextView) v.findViewById(R.id.tvPack);
final CheckBox addCheckbox = (CheckBox) v
.findViewById(R.id.addCheckbox);
Log.d("AppInfoAdapter", "Controls from layout Resources Loaded");
// set data to display
ivAppIcon.setImageDrawable(entry.loadIcon(mPackManager));
tvAppName.setText(entry.activityInfo.loadLabel(mPackManager));
tvPkgName.setText(entry.activityInfo.packageName);
Log.d("AppInfoAdapter", "Data Set To Display");
addCheckbox
.setOnClickListener(new View.OnClickListener() {
@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");
saveImageToExternalStorage(default_b);
saveImageToInternalStorage(default_b);
Log.d("AppInfoAdapter", "Scaled BM saved to External Storage");
Intent intent = new Intent(v.getContext(), GridViewAdapter.class);
// intent.hasExtra("bitmapA");
v.getContext().startActivity(intent);
Log.d("AppInfoAdapter", "Intent started to send Bitmap");
}
}
} else {
System.out.println("Un-Checked");
}
}
});
// return view
return v;
}
这里是gridView的适配器：
package com.example.awesomefilebuilderwidget;
IMPORTS
public class GridViewAdapter extends BaseAdapter {
private Context Context;
// Keep all Images in array list
public ArrayList<Integer> drawables = new ArrayList<Integer>();
CheckBox mCheckBox=null;
// Constructor
public GridViewAdapter(Context c){
Context = c;
Log.d("GridViewAdapter", "Constructor is set");
drawables.add(R.drawable.pattern1);
Log.d("GridViewAdapter", "pattern1 added");
drawables.add(R.drawable.pattern2);
Log.d("GridViewAdapter", "pattern2 added");
drawables.add(R.drawable.trashcan);
Log.d("GridViewAdapter", "trashcan added");
drawables.add(R.drawable.ic_launcher);
Log.d("GridViewAdapter", "ic_launcher added");
Bitmap default_b = BitmapFactory.decodeFile("picture");
}
public void setCheckBox(CheckBox checkbox){
mCheckBox=checkbox;
}
@Override
// How many items are in the data set represented by this Adapter
public int getCount() {
return drawables.size();
}
@Override
// Get the data item associated with the specified position in the
// data set
public Object getItem(int position) {
return drawables.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public boolean isSdReadable() {
boolean mExternalStorageAvailable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = true;
Log.i("isSdReadable", "External storage card is readable.");
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
Log.i("isSdReadable", "External storage card is readable.");
mExternalStorageAvailable = true;
} else {
// Something else is wrong. It may be one of many other
// states, but all we need to know is we can neither read nor write
mExternalStorageAvailable = false;
}
return mExternalStorageAvailable;
}
public Bitmap getThumbnail() {
final String APP_PATH_SD_CARD = "/TEST/";
final String APP_THUMBNAIL_PATH_SD_CARD = "thumbnails";
String filename = "AFBWIcon.png";
String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + APP_PATH_SD_CARD + APP_THUMBNAIL_PATH_SD_CARD;
Bitmap thumbnail = null;
// Look for the file on the external storage
try {
if (isSdReadable() == true) {
thumbnail = BitmapFactory.decodeFile(fullPath + "/" + filename);
}
} catch (Exception e) {
Log.e("getThumbnail() on external storage", e.getMessage());
}
// If no file on external storage, look in internal storage
if (thumbnail == null) {
try {
File filePath = Context.getFileStreamPath(filename);
FileInputStream fi = new FileInputStream(filePath);
thumbnail = BitmapFactory.decodeStream(fi);
} catch (Exception ex) {
Log.e("getThumbnail() on internal storage", ex.getMessage());
}
}
return thumbnail;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Try to reuse the views
ImageView view = (ImageView) convertView;
@SuppressWarnings("unused")
boolean checked = (mCheckBox==null)?false:(((CheckBox) mCheckBox).isChecked());
// if convert view is null then create a new instance else reuse it
if (view == null) {
view = new ImageView(Context);
Log.d("GridViewAdapter", "new imageView added");
}
if(checked = true){
isSdReadable();
getThumbnail();
} else {
Log.e("GridView", "Icons not for use");
}
view.setImageResource(drawables.get(position));
view.setScaleType(ImageView.ScaleType.CENTER_CROP);
view.setLayoutParams(new android.widget.GridView.LayoutParams(70, 70));
view.setTag(String.valueOf(position));
return view;
}
}
请注意我在GridView的另一个类中设置了这个：
android.widget.GridView gridView = (android.widget.GridView) findViewById(R.id.GRIDVIEW1);
// Instance of Adapter Class
GridViewAdapter mGridViewAdapter= new GridViewAdapter(this);
gridView.setAdapter(mGridViewAdapter);
CheckBox mCheckBox = (CheckBox) findViewById(R.id.addCheckbox);
mGridViewAdapter.setCheckBox(mCheckBox);
现在，问题是两件事：
当我打开我的应用程序并创建gridView时，我收到此错误：
12-07 17：51：33.596：内部存储上的E / getThumbnail（）（32607）：/ data / data / com.example.awesomefilebuilderwidget / files / AFBWIicon.png（没有这样的文件或目录）
这是有道理的，因为直到复选框的onClick方法（或至少它应该如何）才创建文件
这导致问题2
我试图实现一个系统，在单击复选框之后它不会检查文件，但它显然不起作用。
我该怎么办？！