iam 对 Android 开发相当陌生,所以 iam 试图制作的是可以从 url 显示 pdf 的应用程序,
我想在从网络加载 pdf 文件时显示进度条(某些 pdf 文件超过 15mb)我该怎么做?
iam 使用 com.github.barteksc.pdfviewer.PDFView
显示来自网络的 pdf
这是我的 pdf 展示 Activity
private PDFView mPDFview;
private String mStoreId;
private FirebaseDatabase mFirebaseDatabase;
private DatabaseReference mReference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_flyer);
mFirebaseDatabase = FirebaseDatabase.getInstance();
mReference = mFirebaseDatabase.getReference("Store");
if (getIntent()!=null)
{
mStoreId = getIntent().getStringExtra("StoreId");
}
if (!mStoreId.isEmpty())
{
getUrlStoreFlyer(mStoreId);
}
}
private void getUrlStoreFlyer(String storeId) {
mReference.child(storeId).addValueEventListener(new ValueEventListener()
{
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Store storeChain = dataSnapshot.getValue(Store.class);
String pdfUrl = storeChain.getFlyerPDF().toString();
mPDFview = findViewById(R.id.flyer_pdfView);
new RetrievePDFStream().execute(pdfUrl);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
class RetrievePDFStream extends AsyncTask<String, Void, InputStream>
{
@Override
protected InputStream doInBackground(String... strings)
{
InputStream inputStream = null;
try{
URL url = new URL(strings[0]);
HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
if (urlConnection.getResponseCode()==200)
{
inputStream = new BufferedInputStream(urlConnection.getInputStream());
}
}
catch (IOException e)
{
return null;
}
return inputStream;
}
@Override
protected void onPostExecute(InputStream inputStream) {
mPDFview.fromStream(inputStream).load();
}
}
@Override
public void onBackPressed() {
finish();
overridePendingTransition(0, 0);
}
}
这是我的 xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.test.FlyerActivity">
<ProgressBar
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="150dp"
android:id="@+id/progressBar2" />
<com.github.barteksc.pdfviewer.PDFView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/flyer_pdfView"/>
enter code here
</RelativeLayout>
最佳答案
这是我使用的并且效果完美的:
@Override
protected void onPostExecute(InputStream inputStream) {
mPDFview.fromStream(inputStream).onLoad(new OnLoadCompleteListener() {
@Override
public void loadComplete(int nbPages) {
ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar2);
progressBar.setVisibility(View.GONE);
}
}).load();
}
关于java - 加载pdf文件时显示进度条,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46876935/