Question

我尝试在我的应用程序中显示.pdf文档。我无法显示它。我无法使用adobe reader获取无效的文档路径错误，无法打开pdf viewer显示文件。请你们中的任何一个让我知道我在这里做的错误。如果有更好的方法来实现这一点，请教我。我已经发布了我正在使用的代码：

public class HelpScreen extends ActionBarActivity {

    Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_help_screen);

        // Initializing, setting text and color of tool bar
        toolbar = (Toolbar) findViewById(R.id.appBar);
        setSupportActionBar(toolbar);
        toolbar.setTitleTextColor(Color.WHITE);

        CopyReadAssets();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_help_screen, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    private void CopyReadAssets()
    {
        AssetManager assetManager = getAssets();
        Log.d("Pana", "The value of assests is " +assetManager);

        InputStream in = null;
        OutputStream out = null;
        File file = new File(getFilesDir(), "help_document_task_management_system_document_4.pdf");
        try
        {
            in = assetManager.open("help_document_task_management_system_document_4.pdf");
            out = openFileOutput(file.getName(), Context.MODE_PRIVATE);

            copyFile(in, out);
            in.close();
            in = null;
            out.flush();
            out.close();
            out = null;
        } catch (Exception e)
        {
            Log.e("tag", e.getMessage());
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(
                Uri.parse("file://" + getFilesDir() + "/" + "/help_document_task_management_system_document_4.pdf"),
                "application/pdf");


        startActivity(intent);
    }

    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);
        }
    }
}

编辑代码：

public class HelpScreen extends ActionBarActivity {

    Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_help_screen);

        // Initializing, setting text and color of tool bar
        toolbar = (Toolbar) findViewById(R.id.appBar);
        setSupportActionBar(toolbar);
        toolbar.setTitleTextColor(Color.WHITE);

        CopyReadAssets();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_help_screen, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    private void CopyReadAssets() {
        AssetManager assetManager = getAssets();
        Log.d("Pana", "The value of assests is " + assetManager);

        InputStream in = null;
        OutputStream out = null;
        File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "help_document_task_management_system_document_4.pdf");
        // File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "help_document_task_management_system_document_4.pdf");
        try {
            in = assetManager.open("help_document_task_management_system_document_4.pdf");
            out = openFileOutput(file.getName(), Context.MODE_PRIVATE);

            copyFile(in, out);
            in.close();
            in = null;
            out.flush();
            out.close();
            out = null;
        } catch (Exception e) {
            Log.e("tag", e.getMessage());
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(
                Uri.fromFile(file), "application/pdf");
        startActivity(intent);
    }

    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);
        }
    }
}

请让我知道我的错误并帮助我解决这个问题。提前谢谢。

Answer 1

第三方应用无权访问该文件。使用FileProvider投放，或将文件复制到external storage而不是internal storage。

Answer 2

在您的意图创建中/之后，您的文件路径中似乎有两个getFilesDir()。

无法在应用程序中打开.pdf文件

2 个答案: