我正在使用NoNonsense-FilePicker来过滤pdf文件的SD卡，方法是扩展FilePickerActivity并通过它创建一个FilteredFilePickerFragment实例，但我得到一个与其资源中的图像按钮相关的错误。
这是File Picker Fragment Extender：
public class FilePickerFragmentExtender extends FilePickerActivity {
public FilePickerFragmentExtender() {
super();
}
@Override
protected AbstractFilePickerFragment<File> getFragment(@Nullable String startPath, int mode, boolean allowMultiple, boolean allowCreateDir, boolean allowExistingFile, boolean singleClick) {
AbstractFilePickerFragment<File> fragment = new FilteredFilePickerFragment();
// startPath is allowed to be null. In that case, default folder should be SD-card and not "/"
fragment.setArgs(startPath != null ? startPath : Environment.getExternalStorageDirectory().getPath(),
mode, allowMultiple, allowCreateDir, allowExistingFile, singleClick);
return fragment;
}
}
这是Filtered File Picker Fragment：
public class FilteredFilePickerFragment extends FilePickerFragment {
private static final String TAG = "FilteredFilePickerFragm";
// File extension to filter on
private static final String EXTENSION = ".pdf";
public FilteredFilePickerFragment() {
super();
}
/**
* @param file
* @return The file extension. If file has no extension, it returns null.
*/
private String getExtension(@NonNull File file) {
String path = file.getPath();
int i = path.lastIndexOf(".");
if (i < 0) {
return null;
} else {
return path.substring(i);
}
}
@Override
protected boolean isItemVisible(final File file) {
boolean ret = super.isItemVisible(file);
if (ret && !isDir(file) && (mode == MODE_FILE || mode == MODE_FILE_AND_DIR)) {
String ext = getExtension(file);
return ext != null && EXTENSION.equalsIgnoreCase(ext);
}
return ret;
}
}
错误：
FATAL EXCEPTION: main
Process: com.pdfviewer.debug, PID: 15693
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pdfviewer.debug/com.pdfviewer.FilePickerFragmentExtender}: android.view.InflateException: Binary XML file line #90: Binary XML file line #90: Error inflating class ImageButton
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2684)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2751)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1496)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6186)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
Caused by: android.view.InflateException: Binary XML file line #90: Binary XML file line #90: Error inflating class ImageButton
Caused by: android.view.InflateException: Binary XML file line #90: Error inflating class ImageButton
Caused by: java.lang.UnsupportedOperationException: Failed to resolve attribute at index 5: TypedValue{t=0x2/d=0x7f010031 a=-1}
at android.content.res.TypedArray.getColorStateList(TypedArray.java:528)
at android.widget.ImageView.<init>(ImageView.java:180)
at android.widget.ImageButton.<init>(ImageButton.java:84)
at android.widget.ImageButton.<init>(ImageButton.java:80)
at android.support.v7.widget.AppCompatImageButton.<init>(AppCompatImageButton.java:60)
at android.support.v7.widget.AppCompatImageButton.<init>(AppCompatImageButton.java:56)
at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:118)
at android.support.v7.app.AppCompatDelegateImplV9.createView(AppCompatDelegateImplV9.java:1026)
at android.support.v7.app.AppCompatDelegateImplV9.onCreateView(AppCompatDelegateImplV9.java:1083)
at android.view.LayoutInflater$FactoryMerger.onCreateView(LayoutInflater.java:192)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:769)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at com.nononsenseapps.filepicker.AbstractFilePickerFragment.inflateRootView(AbstractFilePickerFragment.java:239)
at com.nononsenseapps.filepicker.AbstractFilePickerFragment.onCreateView(AbstractFilePickerFragment.java:165)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2239)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1332)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1641)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:794)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2415)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2200)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2153)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2063)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:388)
com.pdfviewer.debug E/AndroidRuntime: at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:554)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:177)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1249)
at android.app.Activity.performStart(Activity.java:6701)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2647)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2751)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1496)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6186)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
我搜索并发现它与文件选择器的主题有关但我也没有在主题中发现任何错误：
<style name="FilePickerTheme" parent="NNF_BaseTheme">
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<!-- Setting a divider is entirely optional -->
<item name="nnf_list_item_divider">?android:attr/listDivider</item>
<!-- Need to set this also to style create folder dialog -->
<item name="alertDialogTheme">@style/FilePickerAlertDialogTheme</item>
</style>
<style name="FilePickerAlertDialogTheme" parent="Theme.AppCompat.Dialog.Alert">
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
colorss.xml：
<color name="colorPrimary">#3f51b5</color>
<color name="colorPrimaryDark">#303f9f</color>
<color name="colorAccent">#5495fd</color>
答案 0 :(得分：0)
问题实际上与我应用于此片段android:theme="@style/AppTheme"的父活动的主题有关，导致应用程序崩溃，因为布局没有找到它的适当属性，调试xml有点棘手。 / p>
资源中的ImageButton：
<ImageButton
android:id="@+id/nnf_button_ok_newfile"
// this style line is the cause
style="?attr/borderlessButtonStyle"
android:layout_width="48dp"
android:layout_height="48dp"
android:hint="@android:string/ok"
app:srcCompat="@drawable/nnf_ic_save_black_24dp"
android:tint="?attr/nnf_save_icon_color"/>
并且解决此问题的方法是将清单中的活动主题更改为android:theme="@style/FilePickerTheme"，这对于在活动之间使用不同主题的用户体验有害，或者另一个解决方案是覆盖{{1方法并在创建活动之前设置主题，如下所示：
FilteredFilePickerFragment
onCreate