我想,当用户点击一个按钮来打开PDF文件。目前,我使用此代码来实现这一目标:
Uri path = Uri.fromFile(new File("file:///android_asset/regola11_1.pdf"));
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(pdfIntent);
但它不工作。
当我选择使用Adobe Acrobat,我得到一个消息,显示为一个面包,上面写着
"This file could not be accessed Check the location or the network and try again."
当我和驱动器PDF阅读器尝试,我得到
"Cannot display PDF ( regola11_1.pdf cannot be opened)"
该PDF文件存储在
app > build > intermediates > assets
问题出在哪儿?
编辑
现在,我使用下面的代码:
File file = new File("\"file:///android_asset/regola11_1.pdf");
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(path, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
context.startActivity(intent);
}
catch (ActivityNotFoundException e) {
Toast.makeText(context, "No application available to view PDF", Toast.LENGTH_LONG).show();
}
但是当我尝试通过点击按钮来打开PDF,应用程序崩溃。
这是日志我得到:
05-31 10:05:25.132 24474-24474/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.andrey.andreyvedis.iamaref, PID: 24474
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.Context.startActivity(android.content.Intent)' on a null object reference
at com.andrey.andreyvedis.iamaref.FragmentR11.onClick(FragmentR11.java:147)
at android.view.View.performClick(View.java:4781)
at android.view.View$PerformClick.run(View.java:19873)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5293)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
这是我的课:
public class FragmentR11 extends Fragment implements View.OnClickListener{
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
Context context;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment FragmentR11.
*/
// TODO: Rename and change types and number of parameters
public static FragmentR11 newInstance(String param1, String param2) {
FragmentR11 fragment = new FragmentR11();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public FragmentR11() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_r11, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getActivity().findViewById(R.id.bD1).setOnClickListener(this);
getActivity().findViewById(R.id.bD2).setOnClickListener(this);
getActivity().findViewById(R.id.bD3).setOnClickListener(this);
getActivity().findViewById(R.id.bD4).setOnClickListener(this);
getActivity().findViewById(R.id.bD5).setOnClickListener(this);
getActivity().findViewById(R.id.bD6).setOnClickListener(this);
getActivity().findViewById(R.id.bD7).setOnClickListener(this);
getActivity().findViewById(R.id.bD8).setOnClickListener(this);
getActivity().findViewById(R.id.bD9).setOnClickListener(this);
getActivity().findViewById(R.id.bD10).setOnClickListener(this);
getActivity().findViewById(R.id.bD11).setOnClickListener(this);
getActivity().findViewById(R.id.bD12).setOnClickListener(this);
getActivity().findViewById(R.id.bD13).setOnClickListener(this);
getActivity().findViewById(R.id.bD14).setOnClickListener(this);
getActivity().findViewById(R.id.bD15).setOnClickListener(this);
getActivity().findViewById(R.id.bD16).setOnClickListener(this);
getActivity().findViewById(R.id.bD17).setOnClickListener(this);
}
/**private void openPDF(final String pathToPDF) {
File file = new File(pathToPDF);
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setDataAndType(path, "application/pdf");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(getActivity(), "Devi installare un'app per aprire PDF, come Adobe Acrobat Reader ", Toast.LENGTH_SHORT).show();
}
}*/
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.bD1: {
/**Uri path = Uri.fromFile(new File("regola11_1.pdf"));
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(pdfIntent);
Toast.makeText(getActivity(), "Hai cliccato Regola 1 in Reg11 ", Toast.LENGTH_SHORT).show();*/
File file = new File("\"file:///android_asset/regola11_1.pdf");
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(path, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
context.startActivity(intent);
}
catch (ActivityNotFoundException e) {
Toast.makeText(context, "No application available to view PDF", Toast.LENGTH_LONG).show();
}
break;
}
case R.id.bD2:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 2 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD3:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 3 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD4:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 4 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD5:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 5 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD6:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 6 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD7:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 7 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD8:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 8 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD9:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 9 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD10:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 10 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD11:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 11 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD12:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 12 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD13:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 13 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD14:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 14 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD15:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 15 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD16:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 16 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD17:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 17 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
}
}
}
有人能帮我吗?
编辑2
我已经找到了解决办法,检查我的回答如下的代码。
谢谢大家的答案。
玉家伙,问题解决了!
这是我用它来打开PDF文件,存储在外部存储器的代码:
File pdfFile = new File(Environment.getExternalStorageDirectory(),"namePdfFile.pdf");//File path
if (pdfFile.exists()) //Checking if the file exists or not
{
Uri path = Uri.fromFile(pdfFile);
Intent objIntent = new Intent(Intent.ACTION_VIEW);
objIntent.setDataAndType(path, "application/pdf");
objIntent.setFlags(Intent. FLAG_ACTIVITY_CLEAR_TOP);
startActivity(objIntent);//Starting the pdf viewer
} else {
Toast.makeText(getActivity(), "The file not exists! ", Toast.LENGTH_SHORT).show();
}
第三方应用程序无法通过file:///android_asset
网址访问您的资产。
您可以:
StreamProvider
,要在你的应用程序一个ContentProvider
可以从资产直接服务于PDF,或FileProvider
,复制从资产内部存储的文件后,如表现在this sample app,或Uri
创建Uri.fromFile()
指向该副本设置数据"file:///" + filePath
摸索出适合我。
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(filePath));
intent.setDataAndType(Uri.parse("file:///" + filePath), "application/pdf");
context.startActivity(intent);
添加此权限,并再次检查:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
看来,有一个与访问该文件的问题。
尝试打开另一个PDF文件,让我们知道什么是日志。
而且我认为你不能使用此:file:///android_asset
并采取看看这个:
选择具有ExternalStorageDirectory
文件:
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() +"/"+ filename);
Intent target = new Intent(Intent.ACTION_VIEW);
target.setDataAndType(Uri.fromFile(file),"application/pdf");
target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
Intent intent = Intent.createChooser(target, "Open File");
来源:https://stackoverflow.com/a/17453242/4945820
随着资产的文件夹:
这里是代码,如果你使用这个与Assets
文件夹!
File file = new File("file:///android_asset/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);
然后添加上述许可,并与资产代码检查一遍。此外,检查:https://stackoverflow.com/q/28032029/4945820
我有同样的问题,处理我意识到,我错过了添加“/”文件的路径和文件名之间的问题小时后。
因此,文件未找到和我有“此文件无法访问检查位置或网络,然后再试一次。”信息。
希望这会帮助别人;)
我的问题是添加此权限后,解决了:)
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
这个错误是因为每次PDF开始重新下载,但因为有下载水湿在有限的时间内完成时,它显示无效的格式错误,文件编号仍然在下载喜欢state.Use代码..
Searchedtext = text.getText().toString();
File file = new File(Environment.getExternalStorageDirectory() + "/pdf", Searchedtext + ".pdf");
if (file.exists()) {
showPdf();
}
else {
download();
showPdf();
}