Android通過Intent打開pdf文件

Question

我在sdcard的某些文件夾中有一些pdf文件。 我創建了一個將所有pdf顯示為ListView的應用程序。 當我單擊任何pdf文件時，它在OfficeSuite應用程序中給出了錯誤（未支持的文件格式或錯誤的文件格式。代碼有問題。這是代碼。

//顯示為ListVIew的項目的代碼

    ListView lv;
    ArrayList<String> FilesInFolder = GetFiles(Environment.getExternalStorageDirectory()
            + "/SOMEFOLDER");
    lv = (ListView) findViewById(R.id.filelist);

    lv.setAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, FilesInFolder));



    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            // Clicking on items
            open_File();
        }
    });

    public ArrayList<String> GetFiles(String DirectoryPath) {
    ArrayList<String> MyReports = new ArrayList<String>();
    File f = new File(DirectoryPath);

    f.mkdirs();
    File[] files = f.listFiles();
    if (files.length == 0)
        return null;
    else {
        for (int i=0; i<files.length; i++)
            MyReports.add(files[i].getName());
    }

    return MyReports;
}

//通過VIA Intent打開文件的代碼

    public void open_File(){
    File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/SOMEFOLDER");
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.fromFile(file), "application/pdf");
    intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
    Intent intent1 = Intent.createChooser(intent, "Open With");
    try {
        startActivity(intent1);
    } catch (ActivityNotFoundException e) {
        // Instruct the user to install a PDF reader here, or something
    }

錯誤：

文件格式損壞或不受支持

Answer 1

我認為您忘記了指定文件。 查看您的代碼，您僅將其指向文件夾，而沒有指向文件本身。 我認為這就是為什么它告訴您格式錯誤的原因，因為它不以.pdf結尾

File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "SOMEFOLDER" + File.separator + "pdffile.pdf");

編輯：根據您的評論修改方法

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
        // Clicking on items
        String fileName = FilesInFolder.get(position);
        open_File(fileName);
    }
});

public void open_File(String filename){
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/SOMEFOLDER", filename);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
Intent intent1 = Intent.createChooser(intent, "Open With");
try {
    startActivity(intent1);
} catch (ActivityNotFoundException e) {
    // Instruct the user to install a PDF reader here, or something
}