import android.content.res.AssetManager;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import androidx.appcompat.app.AppCompatActivity;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MainActivity extends AppCompatActivity {
PDFiumHelper mPdFiumHelper;
private void copyAssets() {
AssetManager assetManager = getAssets();
String[] files = null;
try {
files = assetManager.list("");
} catch (IOException e) {
Log.e("tag", "Failed to get asset file list.", e);
}
for (String filename : files) {
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(filename);
String outDir = getFilesDir().getAbsolutePath();
File outFile = new File(outDir, filename);
out = new FileOutputStream(outFile);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch (IOException e) {
Log.e("tag", "Failed to copy asset file: " + filename, e);
}
}
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
copyAssets();
mPdFiumHelper = new PDFiumHelper(this);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
return mPdFiumHelper.onKeyDown(keyCode,event);
}
}
辅助类
import android.content.Intent;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.core.content.FileProvider;
import com.github.barteksc.pdfviewer.PDFView;
import com.github.barteksc.pdfviewer.listener.OnErrorListener;
import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;
import com.github.barteksc.pdfviewer.util.FitPolicy;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.karumi.dexter.MultiplePermissionsReport;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.multi.MultiplePermissionsListener;
import java.io.File;
import java.util.Calendar;
import java.util.List;
public class PDFiumHelper implements MultiplePermissionsListener {
AppCompatActivity mAppCompatActivity;
public PDFiumHelper(AppCompatActivity mAppCompatActivity) {
this.mAppCompatActivity = mAppCompatActivity;
onCreate();
}
public PDFiumHelper() {
}
Button btnFile1, btnFile2;
long firstTime;
PDFView pdfView;
CommonUtility mCommonUtility;
boolean hasPermissions;
FloatingActionButton ibtn_share;
File localPDFFile;
String pdfTitle = "Mathematics Paper 2020";
String pdfExtraText = "this paper is made using the quantum paper.";
ConstraintLayout root;
String path1,path2;
protected void onCreate() {
path1 = mAppCompatActivity.getFilesDir() + "/SatsangDiksha.pdf";
path2 = mAppCompatActivity.getFilesDir() + "/sample.pdf";
btnFile1 = (Button) mAppCompatActivity.findViewById(R.id.btnFile1);
btnFile2 = (Button) mAppCompatActivity.findViewById(R.id.btnFile2);
root = mAppCompatActivity.findViewById(R.id.root);
pdfView = new PDFView(mAppCompatActivity, null);
pdfView.setLayoutParams(new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
root.addView(pdfView);
ibtn_share = new FloatingActionButton(mAppCompatActivity);
ConstraintLayout.LayoutParams params = new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
int margin = convertDpToPixel(20);
params.setMargins(margin, margin, margin, margin);
params.bottomToBottom = root.getId();
params.endToEnd = root.getId();
ibtn_share.setLayoutParams(params);
ibtn_share.setImageResource(R.drawable.ic_share);
ibtn_share.setBackgroundTintList(ColorStateList.valueOf(mAppCompatActivity.getResources().getColor(R.color.purple_500)));
ibtn_share.setColorFilter(Color.WHITE);
root.addView(ibtn_share);
btnFile1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
loadPdfFromFile(path1);
}
});
btnFile2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
loadPdfFromFile(path2);
}
});
mCommonUtility = new CommonUtility(mAppCompatActivity);
if (hasPermissions) {
} else {
mCommonUtility.askForPermissionBeforeStart(this);
}
ibtn_share.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (hasPermissions) {
shareFile();
} else {
mCommonUtility.askForPermissionBeforeStart(PDFiumHelper.this);
}
}
});
}
boolean flag = false;
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_DPAD_LEFT)) {
if (flag) {
loadPdfFromFile(path1);
flag = false;
} else {
loadPdfFromFile(path2);
flag = true;
}
return false;
}
return false;
}
public void shareFile() {
Intent intentShareFile = new Intent(Intent.ACTION_SEND);
if (localPDFFile.exists()) {
intentShareFile.setType("application/pdf");
intentShareFile.putExtra(Intent.EXTRA_STREAM, FileProvider.getUriForFile(mAppCompatActivity, BuildConfig.APPLICATION_ID + ".provider", localPDFFile));
intentShareFile.putExtra(Intent.EXTRA_SUBJECT,
pdfTitle);
intentShareFile.putExtra(Intent.EXTRA_TEXT, pdfExtraText);
mAppCompatActivity.startActivity(Intent.createChooser(intentShareFile, "Share File using"));
} else {
Toast.makeText(mAppCompatActivity, "File not loaded.", Toast.LENGTH_SHORT).show();
}
}
public long showCurrentTime() {
Calendar c = Calendar.getInstance();
int hours = c.get(Calendar.HOUR);
int minutes = c.get(Calendar.MINUTE);
int seconds = c.get(Calendar.SECOND);
int mseconds = c.get(Calendar.MILLISECOND);
return System.currentTimeMillis();
}
public void loadPdfFromFile(String path) {
firstTime = showCurrentTime();
try {
localPDFFile = new File(path);
pdfView.fromFile(localPDFFile)
.enableAntialiasing(true)
.enableDoubletap(true)
.onLoad(new OnLoadCompleteListener() {
@Override
public void loadComplete(int nbPages) {
double timee = firstTime - showCurrentTime();
double ms = Math.abs(timee) / 1000;
Log.e("===", "onDocumentLoaded: Time Taken :- " + ms + " Seconds");
Toast.makeText(mAppCompatActivity, ms + " Seconds", Toast.LENGTH_SHORT).show();
}
})
.onError(new OnErrorListener() {
@Override
public void onError(Throwable t) {
t.printStackTrace();
Toast.makeText(mAppCompatActivity, "Load some file.", Toast.LENGTH_SHORT).show();
}
})
.scrollHandle(new DefaultScrollHandle(mAppCompatActivity))
.pageFitPolicy(FitPolicy.WIDTH)
.autoSpacing(false)
.load();
} catch (Throwable th) {
}
}
@Override
public void onPermissionsChecked(MultiplePermissionsReport multiplePermissionsReport) {
if (multiplePermissionsReport.areAllPermissionsGranted()) {
hasPermissions = true;
if (hasPermissions) {
}
}
if (multiplePermissionsReport.isAnyPermissionPermanentlyDenied()) {
mCommonUtility.showSettingsDialog();
}
}
@Override
public void onPermissionRationaleShouldBeShown(List<PermissionRequest> list, PermissionToken permissionToken) {
mCommonUtility.showPermissionRationale(permissionToken);
}
public int convertDpToPixel(int dp) {
return dp * (mAppCompatActivity.getResources().getDisplayMetrics().densityDpi / DisplayMetrics.DENSITY_DEFAULT);
}
public int convertPixelsToDp(int px) {
return px / (mAppCompatActivity.getResources().getDisplayMetrics().densityDpi / DisplayMetrics.DENSITY_DEFAULT);
}
}
提供程序路径文件。
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
name="external"
path="." />
<external-files-path
name="external_files"
path="." />
<cache-path
name="cache"
path="." />
<external-cache-path
name="external_cache"
path="." />
<files-path
name="files"
path="." />
</paths>
安卓清单文件。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.qp.pdfiumproject">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:requestLegacyExternalStorage="true"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.PdfiumProject">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
</application>
</manifest>
