当我更改页面方向时，会出现在页面的开头 [英] When I change the page orientation come at the beginning of page
本文介绍了当我更改页面方向时，会出现在页面的开头的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用 barteksc-AndroidPdfViewer .我正在使用此代码
I am using barteksc-AndroidPdfViewer. I am using this code
package com.github.barteksc.sample;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.provider.OpenableColumns;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;
import com.github.barteksc.pdfviewer.PDFView;
import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;
import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;
import com.github.barteksc.pdfviewer.scroll.DefaultScrollHandle;
import com.shockwave.pdfium.PdfDocument;
import org.androidannotations.annotations.AfterViews;
import org.androidannotations.annotations.EActivity;
import org.androidannotations.annotations.NonConfigurationInstance;
import org.androidannotations.annotations.OnActivityResult;
import org.androidannotations.annotations.OptionsItem;
import org.androidannotations.annotations.OptionsMenu;
import org.androidannotations.annotations.ViewById;
import java.util.List;
@EActivity(R.layout.activity_main)
@OptionsMenu(R.menu.options)
public class PDFViewActivity extends AppCompatActivity implements OnPageChangeListener, OnLoadCompleteListener {
private static final String TAG = PDFViewActivity.class.getSimpleName();
private final static int REQUEST_CODE = 42;
public static final int PERMISSION_CODE = 42042;
public static final String SAMPLE_FILE = "sample.pdf";
public static final String READ_EXTERNAL_STORAGE = "android.permission.READ_EXTERNAL_STORAGE";
@ViewById
PDFView pdfView;
@NonConfigurationInstance
Uri uri;
@NonConfigurationInstance
Integer pageNumber = 0;
String pdfFileName;
@OptionsItem(R.id.pickFile)
void pickFile() {
int permissionCheck = ContextCompat.checkSelfPermission(this,
READ_EXTERNAL_STORAGE);
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(
this,
new String[]{READ_EXTERNAL_STORAGE},
PERMISSION_CODE
);
return;
}
launchPicker();
}
void launchPicker() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("application/pdf");
try {
startActivityForResult(intent, REQUEST_CODE);
} catch (ActivityNotFoundException e) {
//alert user that file manager not working
Toast.makeText(this, R.string.toast_pick_file_error, Toast.LENGTH_SHORT).show();
}
}
@AfterViews
void afterViews() {
if (uri != null) {
displayFromUri(uri);
} else {
displayFromAsset(SAMPLE_FILE);
}
setTitle(pdfFileName);
}
private void displayFromAsset(String assetFileName) {
pdfFileName = assetFileName;
pdfView.fromAsset(SAMPLE_FILE)
.defaultPage(pageNumber)
.onPageChange(this)
.enableAnnotationRendering(true)
.onLoad(this)
.scrollHandle(new DefaultScrollHandle(this))
.load();
}
private void displayFromUri(Uri uri) {
pdfFileName = getFileName(uri);
pdfView.fromUri(uri)
.defaultPage(pageNumber)
.onPageChange(this)
.enableAnnotationRendering(true)
.onLoad(this)
.scrollHandle(new DefaultScrollHandle(this))
.load();
}
@OnActivityResult(REQUEST_CODE)
public void onResult(int resultCode, Intent intent) {
if (resultCode == RESULT_OK) {
uri = intent.getData();
displayFromUri(uri);
}
}
@Override
public void onPageChanged(int page, int pageCount) {
pageNumber = page;
setTitle(String.format("%s %s / %s", pdfFileName, page + 1, pageCount));
}
public String getFileName(Uri uri) {
String result = null;
if (uri.getScheme().equals("content")) {
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
try {
if (cursor != null && cursor.moveToFirst()) {
result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
}
} finally {
if (cursor != null) {
cursor.close();
}
}
}
if (result == null) {
result = uri.getLastPathSegment();
}
return result;
}
@Override
public void loadComplete(int nbPages) {
PdfDocument.Meta meta = pdfView.getDocumentMeta();
Log.e(TAG, "title = " + meta.getTitle());
Log.e(TAG, "author = " + meta.getAuthor());
Log.e(TAG, "subject = " + meta.getSubject());
Log.e(TAG, "keywords = " + meta.getKeywords());
Log.e(TAG, "creator = " + meta.getCreator());
Log.e(TAG, "producer = " + meta.getProducer());
Log.e(TAG, "creationDate = " + meta.getCreationDate());
Log.e(TAG, "modDate = " + meta.getModDate());
printBookmarksTree(pdfView.getTableOfContents(), "-");
}
public void printBookmarksTree(List<PdfDocument.Bookmark> tree, String sep) {
for (PdfDocument.Bookmark b : tree) {
Log.e(TAG, String.format("%s %s, p %d", sep, b.getTitle(), b.getPageIdx()));
if (b.hasChildren()) {
printBookmarksTree(b.getChildren(), sep + "-");
}
}
}
/**
* Listener for response to user permission request
*
* @param requestCode Check that permission request code matches
* @param permissions Permissions that requested
* @param grantResults Whether permissions granted
*/
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[],
@NonNull int[] grantResults) {
if (requestCode == PERMISSION_CODE) {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
launchPicker();
}
}
}
}
更改页面方向.但是，如果我不得不假设在启动横向时纵向模式和15号页是否改变了页面的页面方向.
to change the orientation of the page. But if I have to assume if the portrait mode and page number 15 in change page orientation of the page when we started the landscape.
请帮助我.
推荐答案
@EActivity(R.layout.activity_pdf_app_bar_main)
@OptionsMenu(R.menu.options)
public class PDFActivity extends AppCompatActivity implements OnPageChangeListener, OnLoadCompleteListener
{
private static final String TAG = PDFActivity.class.getSimpleName();
private final static int REQUEST_CODE = 42;
public static final int PERMISSION_CODE = 42042;
public static final String SAMPLE_FILE = "myPDF.pdf";
public static final String READ_EXTERNAL_STORAGE = "android.permission.READ_EXTERNAL_STORAGE";
private int mCurrentPage = 0;
private final static String KEY_CURRENT_PAGE = "current_page";
private ProgressDialog progressDialog;
@ViewById
PDFView pdfView;
@NonConfigurationInstance
Uri uri;
@NonConfigurationInstance
String pdfFileName;
@OptionsItem(R.id.pickFile)
void pickFile()
{
int permissionCheck = ContextCompat.checkSelfPermission(this, READ_EXTERNAL_STORAGE);
if (permissionCheck != PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(this, new String[]{READ_EXTERNAL_STORAGE}, PERMISSION_CODE);
return;
}
launchPicker();
}
void launchPicker()
{
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("application/pdf");
try
{
startActivityForResult(intent, REQUEST_CODE);
}
catch (ActivityNotFoundException e)
{
Toast.makeText(this, R.string.toast_pick_file_error, Toast.LENGTH_SHORT).show();
}
}
@AfterViews
void afterViews()
{
pdfView.setBackgroundColor(Color.WHITE);
if (uri != null)
{
displayFromUri(uri);
}
else
{
displayFromAsset(SAMPLE_FILE);
}
setTitle(pdfFileName);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
if (getSupportActionBar() != null)
{
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
}
private void displayFromAsset(String assetFileName)
{
pdfFileName = assetFileName;
pdfView.fromAsset(SAMPLE_FILE)
.defaultPage(mCurrentPage)
.enableSwipe(true)
.swipeHorizontal(false)
.enableDoubletap(true)
.password(null)
.enableAntialiasing(true)
.onPageChange(this)
.enableAnnotationRendering(true)
.onPageScroll(new OnPageScrollListener() {
@Override
public void onPageScrolled(int page, float positionOffset) {
Log.d(TAG, "onPageScrolled: page " + page + " positionOffset " + positionOffset);
}
})
.onRender(new OnRenderListener()
{
@Override
public void onInitiallyRendered(int nbPages, float pageWidth, float pageHeight)
{
pdfView.fitToWidth(mCurrentPage);
}
})
.onLoad(new OnLoadCompleteListener() {
@Override
public void loadComplete(int nbPages) {
Log.d(TAG, "loadComplete: totalPages " + nbPages);
}
})
.onError(new OnErrorListener() {
@Override
public void onError(Throwable t) {
Log.d(TAG, " onError");
}
})
.scrollHandle(new DefaultScrollHandle(this))
.spacing(2)
.load();
}
private void displayFromUri(Uri uri)
{
pdfFileName = getFileName(uri);
pdfView.fromUri(uri)
.defaultPage(mCurrentPage)
.onPageChange(this)
.enableAnnotationRendering(true)
.onLoad(this)
.scrollHandle(new DefaultScrollHandle(this))
.load();
}
@OnActivityResult(REQUEST_CODE)
public void onResult(int resultCode, Intent intent)
{
if (resultCode == RESULT_OK)
{
uri = intent.getData();
displayFromUri(uri);
}
}
@Override
public void onPageChanged(int page, int pageCount)
{
mCurrentPage = page;
setTitle(String.format("%s %s / %s", "Page Number", page + 1, pageCount));
}
public String getFileName(Uri uri)
{
String result = null;
if (uri.getScheme().equals("content"))
{
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
try
{
if (cursor != null && cursor.moveToFirst())
{
result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
}
}
finally
{
if (cursor != null)
{
cursor.close();
}
}
}
if (result == null)
{
result = uri.getLastPathSegment();
}
return result;
}
@Override
public void loadComplete(int nbPages)
{
if (mCurrentPage >= 0)
{
pdfView.jumpTo(mCurrentPage);
}
PdfDocument.Meta meta = pdfView.getDocumentMeta();
Log.e(TAG, "title = " + meta.getTitle());
Log.e(TAG, "author = " + meta.getAuthor());
Log.e(TAG, "subject = " + meta.getSubject());
Log.e(TAG, "keywords = " + meta.getKeywords());
Log.e(TAG, "creator = " + meta.getCreator());
Log.e(TAG, "producer = " + meta.getProducer());
Log.e(TAG, "creationDate = " + meta.getCreationDate());
Log.e(TAG, "modDate = " + meta.getModDate());
Log.d(TAG, "totalPages " + nbPages);
printBookmarksTree(pdfView.getTableOfContents(), "-");
}
public void printBookmarksTree(List<PdfDocument.Bookmark> tree, String sep)
{
for (PdfDocument.Bookmark b : tree)
{
Log.e(TAG, String.format("%s %s, p %d", sep, b.getTitle(), b.getPageIdx()));
if (b.hasChildren())
{
printBookmarksTree(b.getChildren(), sep + "-");
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults)
{
if (requestCode == PERMISSION_CODE)
{
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
launchPicker();
}
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
if (item.getItemId() == android.R.id.home)
{
finish();
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(@Nullable Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
if (savedInstanceState != null)
{
mCurrentPage = savedInstanceState.getInt(KEY_CURRENT_PAGE);
}
else
{
mCurrentPage = -1;
}
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
mCurrentPage = savedInstanceState.getInt(KEY_CURRENT_PAGE);
}
@Override
public void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
outState.putInt(KEY_CURRENT_PAGE, mCurrentPage);
}
}
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