我正在尝试打开我下载的pdf文件&保存在外部存储器中.但是当我打开我的应用程序时,它会崩溃并显示以下错误;
08-31 00:58:31.304 1807-1807/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: medimanage.corporate.mobile,PID: 1807
java.lang.RuntimeException: Unable to get provider android.support.v4.content.FileProvider: java.lang.IllegalArgumentException: Missing android.support.FILE_PROVIDER_PATHS Meta-data
at android.app.ActivityThread.installProvider(ActivityThread.java:5856)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:5445)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5384)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1545)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.IllegalArgumentException: Missing android.support.FILE_PROVIDER_PATHS Meta-data
at android.support.v4.content.FileProvider.parsePathStrategy(FileProvider.java:586)
at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:557)
at android.support.v4.content.FileProvider.attachInfo(FileProvider.java:375)
at android.app.ActivityThread.installProvider(ActivityThread.java:5853)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:5445)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5384)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1545)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
以下是我的异步任务,我下载该pdf文件&试图打开它.
package myPackageName.common.postData;
public class DownloadFileFromURL extends AsyncTask<String,String,String> {
private ProgressDialog Dialog;
private Context mContext;
private String folder_main; //= "TermCondition";
private String fileName;//= "termCondition.pdf";
String urlString;
public DownloadFileFromURL(Context mContext,String folderName) {
this.mContext = mContext;
this.folder_main = folderName;
Dialog = new ProgressDialog(this.mContext);
}
@Override
protected String doInBackground(String... f_url) {
try {
urlString = f_url[0];
URL url = new URL(f_url[0]);
File folder = new File(Environment.getExternalStorageDirectory(),this.folder_main);
if (folder.exists()) {
folder.mkdirs();
}
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
FileOutputStream fileOutputStream = new FileOutputStream(Environment.getExternalStorageDirectory() + "/" + "default.pdf");
int totalSize = urlConnection.getContentLength();
byte[] buffer = new byte[AccessibilityNodeInfoCompat.ACTION_DISMISS];
while (true) {
int bufferLength = inputStream.read(buffer);
if (bufferLength <= 0) {
break;
}
fileOutputStream.write(buffer,bufferLength);
}
fileOutputStream.close();
} catch (FileNotFoundException e) {
FileLog.e(mContext.getClass().getName(),e);
} catch (MalformedURLException e2) {
FileLog.e(mContext.getClass().getName(),e2);
} catch (IOException e3) {
FileLog.e(mContext.getClass().getName(),e3);
}
return null;
}
public void showPdf() {
try {
File file = new File(Environment.getExternalStorageDirectory() + "/" + "default.pdf");
try {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
Uri contentUri = FileProvider.getUriForFile(mContext,"medimanage.corporate.mobile.fileprovider",file);
intent.setDataAndType(contentUri,"application/pdf");
} else {
intent.setDataAndType(Uri.fromFile(file),"application/pdf");
}
mContext.startActivity(intent);
} catch (ActivityNotFoundException anfe) {
Toast.makeText(mContext,"No activity found to open this attachment.",Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
FileLog.e(mContext.getClass().getName(),e);
}
}
@Override
protected void onPreExecute() {
Dialog.setMessage("Downloading...");
Dialog.setCancelable(false);
Dialog.setCanceledOnTouchOutside(false);
Dialog.show();
}
@Override
protected void onPostExecute(String s) {
this.Dialog.dismiss();
showPdf();
super.onPostExecute(s);
}
}
以下是AndroidManifest.xml
<application
...>
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="myPackageName.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<Meta-data
android:name="android.support.FILE_PROVIDE_PATHS"
android:resource="@xml/provider_paths" />
</provider>
</application>
和provider_paths.xml有以下代码;
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path path="Android/data/" name="files_root" />
<external-path path="." name="external_storage_root" />
</paths>
我试图在API 19& API 25,但在两个设备中它都会崩溃.我无法找出出错的地方.
我已经提到了this question&也是this link但无法找到我的问题的解决方案.
