无法打开外部应用程序PDF文件

问题描述 投票:9回答:7

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。

android pdf uri assets
7个回答
11
投票

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();

            }

4
投票

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:

  • 尝试使用my StreamProvider,要在你的应用程序一个ContentProvider可以从资产直接服务于PDF,或
  • 从Android支持包中使用FileProvider,复制从资产内部存储的文件后,如表现在this sample app,或
  • 将文件复制到外部存储和使用来自Uri创建Uri.fromFile()指向该副本

2
投票

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);

1
投票

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


0
投票

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;)


0
投票

我的问题是添加此权限后,解决了:)

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

0
投票

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();
}
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