我正在使用Nonsense-FilePicker通过扩展FilePickerActivity并通过它创建过滤FilepickerFragment实例来过滤PDF文件的SD卡，但我会收到与资源中的图像按钮相关的错误。
这是文件拾取器片段扩展器：
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;
}
}
这是过滤的文件拾取器片段：
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提取器的主题有关，但我在主题中没有发现任何错误：
<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>
这个问题实际上与我应用于此片段的父活动android:theme="@style/AppTheme"的主题有关，导致应用程序崩溃，因为布局没有发现其适当的属性，并且调试XML为有点棘手。
资源中的图像键：
<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"/>
解决此问题的解决方案是要么在android:theme="@style/FilePickerTheme"中更改您的活动主题，这对于用户体验对用户的不同主题不利，或者是在活动之间进行不同的主题，或者是覆盖onCreate方法的其他解决方案，并在之前设置主题活动的创建如下：过滤FilepickerFragment
@Override
public void onCreate(Bundle savedInstanceState) {
getActivity().setTheme(R.style.FilePickerTheme);
super.onCreate(savedInstanceState);
}