android - 在 Android 中打开 PDF 文件

Question

我正在尝试打开指向 pdf 文件的链接并在设备上单击按钮时显示 pdf。解决此问题的最佳方法是什么？我希望能够不使用第 3 方软件。所以我知道我可能必须将文件转换为其他文件。

Answer 1

在你的 Button 的点击监听器中试试这个：

File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/example.pdf");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),”application/pdf”);
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(intent);

在使用此代码之前，您应该检查是否有任何 PDF 阅读应用程序可用。

如果您打算实现自己的 PDF 阅读器，请参考此内容。

Answer 2

我认为您应该创建自己的 pdf 阅读器为此您必须下载PDF VIEWER.jar 然后尝试此代码

MainActivity.java

public class MainActivity extends ListActivity {

    String[] pdflist;
    File[] imagelist;
    @Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     //setContentView(R.layout.main);

     File images = Environment.getExternalStorageDirectory();
     imagelist = images.listFiles(new FilenameFilter() {
      public boolean accept(File dir, String name) {
       return ((name.endsWith(".pdf")));
      }
     });
     pdflist = new String[imagelist.length];
     for (int i = 0; i < imagelist.length; i++) {
      pdflist[i] = imagelist[i].getName();
     }
     this.setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, pdflist));
    }

    protected void onListItemClick(ListView l, View v, int position, long id) {
     super.onListItemClick(l, v, position, id);
     String path = imagelist[(int) id].getAbsolutePath();
     openPdfIntent(path);
    }

    private void openPdfIntent(String path) {
     try {
      final Intent intent = new Intent(MainActivity.this, Second.class);
      intent.putExtra(PdfViewerActivity.EXTRA_PDFFILENAME, path);
      startActivity(intent);
     } catch (Exception e) {
      e.printStackTrace();
     }
    }
}

第二个.java

public class Second extends PdfViewerActivity {

      @Override
        public void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
        }

        public int getPreviousPageImageResource() {
         return R.drawable.ic_launcher;
        }

        public int getNextPageImageResource() {
             return R.drawable.ic_launcher;
        }

        public int getZoomInImageResource() {
             return R.drawable.ic_launcher;
        }

        public int getZoomOutImageResource() {
             return R.drawable.ic_launcher;
        }

        public int getPdfPasswordLayoutResource() {
             return R.drawable.ic_launcher;
        }

        public int getPdfPageNumberResource() {
             return R.drawable.ic_launcher;
        }

        public int getPdfPasswordEditField() {
             return R.drawable.ic_launcher;
        }

        public int getPdfPasswordOkButton() {
             return R.drawable.ic_launcher;
        }

        public int getPdfPasswordExitButton() {
             return R.drawable.ic_launcher;
        }

        public int getPdfPageNumberEditField() {
             return R.drawable.ic_launcher;
        }

}