我如何将位图添加到 pdfview，当我触摸它时位图可以变换和移动。我使用来自 joan zapata https://github.com/JoanZapata/android-pdfview的 pdfviewer 。有没有办法解决它。还是有其他图书馆适合我。这是我的活动。我尝试在 pdfview 中添加 ontouchlistener，但 pdfview 中的缩放和扫描不起作用。
package com.example.irfan.signatureapp;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import com.joanzapata.pdfview.PDFView;
import com.joanzapata.pdfview.listener.OnDrawListener;
import com.joanzapata.pdfview.model.PagePart;
import java.io.File;
public class PdfEditorActivity extends AppCompatActivity{
String pdfname;
Bitmap signatureBitmap;
PDFView pdfView;
OnDrawListener drawListener;
Canvas gCanvas;
PagePart pagePart;
private long then;
private int longClickDuration = 2000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pdf_editor);
pdfView = (PDFView) findViewById(R.id.pdfView);
Intent intent = getIntent();
pdfname = intent.getStringExtra("filename");
}
@Override
protected void onResume() {
super.onResume();
loadPdfFile(pdfname);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.pdf_editor_menu,menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
if(item.getItemId()==R.id.menu_add_signature){
drawSignature();
}
return true;
}
void loadPdfFile(String path){
File file = new File(path);
pdfView.fromFile(file)
.defaultPage(0)
.load();
}
void drawSignature(){
final String signaturePath = Environment.getExternalStorageDirectory().toString() + "/saved_signature/mysignature.png";
signatureBitmap = BitmapFactory.decodeFile(signaturePath);
}
}