打开我的应用时，我在LogCat中收到此警告：
12-05 16:45:10.426: W/System.err(12045): java.io.FileNotFoundException: /data/data/com.example.awesomefilebuilderwidget/files/bitmapA (No such file or directory)
12-05 16:45:10.426: W/System.err(12045): at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
12-05 16:45:10.426: W/System.err(12045): at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
12-05 16:45:10.426: W/System.err(12045): at java.io.FileInputStream.<init>(FileInputStream.java:80)
12-05 16:45:10.426: W/System.err(12045): at android.app.ContextImpl.openFileInput(ContextImpl.java:463)
12-05 16:45:10.426: W/System.err(12045): at android.content.ContextWrapper.openFileInput (ContextWrapper.java:152)
12-05 16:45:10.426: W/System.err(12045): at com.example.awesomefilebuilderwidget.GridViewAdapter.getView(GridViewAdapter.java:71)
12-05 16:45:10.436: W/System.err(12045): at android.widget.AbsListView.obtainView(AbsListView.java:1428)
12-05 16:45:10.436: W/System.err(12045): at android.widget.GridView.onMeasure(GridView.java:935)
12-05 16:45:10.436: W/System.err(12045): at android.view.View.measure(View.java:8541)
12-05 16:45:10.436: W/System.err(12045): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581)
12-05 16:45:10.436: W/System.err(12045): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365)
12-05 16:45:10.436: W/System.err(12045): at android.view.View.measure(View.java:8541)
12-05 16:45:10.436: W/System.err(12045): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257)
12-05 16:45:10.436: W/System.err(12045): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-05 16:45:10.436: W/System.err(12045): at android.view.View.measure(View.java:8541)
12-05 16:45:10.436: W/System.err(12045): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
12-05 16:45:10.436: W/System.err(12045): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
12-05 16:45:10.436: W/System.err(12045): at android.view.View.measure(View.java:8541)
12-05 16:45:10.436: W/System.err(12045): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3257)
12-05 16:45:10.436: W/System.err(12045): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-05 16:45:10.436: W/System.err(12045): at android.view.View.measure(View.java:8541)
12-05 16:45:10.436: W/System.err(12045): at android.view.ViewRoot.performTraversals(ViewRoot.java:903)
12-05 16:45:10.436: W/System.err(12045): at android.view.ViewRoot.handleMessage(ViewRoot.java:1961)
12-05 16:45:10.436: W/System.err(12045): at android.os.Handler.dispatchMessage(Handler.java:99)
12-05 16:45:10.436: W/System.err(12045): at android.os.Looper.loop(Looper.java:150)
12-05 16:45:10.436: W/System.err(12045): at android.app.ActivityThread.main(ActivityThread.java:4333)
12-05 16:45:10.436: W/System.err(12045): at java.lang.reflect.Method.invokeNative(Native Method)
12-05 16:45:10.436: W/System.err(12045): at java.lang.reflect.Method.invoke(Method.java:507)
12-05 16:45:10.436: W/System.err(12045): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-05 16:45:10.436: W/System.err(12045): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-05 16:45:10.436: W/System.err(12045): at dalvik.system.NativeStart.main(Native Method)
这是因为它在我想要它之前运行我对fileinputstream的编码。
为了给出一些背景知识，我有一个复选框，在选中时创建一个位图，然后通过这样做将该位图保存到内部存储器： （这是我保存的地方）
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");
SaveImage(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");
}
}
});
saveImage类：
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 +".png";
File file = new File (myDir, fname);
Log.i("AppInfoAdapter", "" + file);
if (file.exists()) file.delete();
try {
// File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
// + "/" + fname + ".png");
FileOutputStream out = mContext.getApplicationContext().openFileOutput("bitmapA", Context.MODE_WORLD_WRITEABLE);
// FileOutputStream out = new FileOutputStream(file);
default_b.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
然后我从另一个类的文件流中获取该位图：
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Try to reuse the views
ImageView view = (ImageView) convertView;
// 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");
}
try {
Bitmap bitmapA = null;
FileInputStream in = Context.openFileInput("bitmapA");
bitmapA = BitmapFactory.decodeStream(in);
in.close();
/*BufferedInputStream buf = new BufferedInputStream(in);
byte[] bitMapA = new byte[buf.available()];
buf.read(bitMapA);
Bitmap bM = BitmapFactory.decodeByteArray(bitMapA, 0, bitMapA.length);
*/view.setImageBitmap(bitmapA);
if (in != null) {
in.close();
}
/*if (buf != null) {
buf.close();
}*/
} catch (Exception e) {
e.printStackTrace();
}
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;
}
由于所有这一切，当我选中复选框时，它不会创建位图，然后将其保存到内存然后从内存中获取并将其设置为imageView。我所有的复选框都打印出“已检查”（就像它应该的那样）
为什么会这样？
请注意，这两个类都扩展了基本适配器
答案 0 :(得分：0)
您是否确定您的应用对磁盘具有写入权限？