Android 从sd卡读取pdf文件

Android 从sd卡读取pdf文件,android,Android,我想读取存储在sd卡中的pdf文件,我尝试使用此代码段 File file = new File(Environment.getExternalStorageDirectory() + "/vvveksperten" + "/ypc.pdf"); PackageManager packageManager = getPackageManager(); Intent testIntent = new Intent(Intent.ACTION_VIE

我想读取存储在sd卡中的pdf文件,我尝试使用此代码段

    File file = new File(Environment.getExternalStorageDirectory()
            + "/vvveksperten" + "/ypc.pdf");

    PackageManager packageManager = getPackageManager();
    Intent testIntent = new Intent(Intent.ACTION_VIEW);
    testIntent.setType("application/pdf");
    List list = packageManager.queryIntentActivities(testIntent,
            PackageManager.MATCH_DEFAULT_ONLY);
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_VIEW);
    Uri uri = Uri.fromFile(file);
    intent.setDataAndType(uri, "application/pdf");
    startActivity(intent);
但它给了我一个错误

ERROR/AndroidRuntime(2611): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///mnt/sdcard/vvveksperten/ypc.pdf typ=application/pdf }

请检查您的设备是否有可用的pdf阅读器应用程序,我想没有

只要使用这个代码

private void viewPdf(Uri file) {
        Intent intent;
        intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(file, "application/pdf");
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException e) {
            // No application to view, ask to download one
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("No Application Found");
            builder.setMessage("Download one from Android Market?");
            builder.setPositiveButton("Yes, Please",
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Intent marketIntent = new Intent(Intent.ACTION_VIEW);
                            marketIntent
                                    .setData(Uri
                                            .parse("market://details?id=com.adobe.reader"));
                            startActivity(marketIntent);
                        }
                    });
            builder.setNegativeButton("No, Thanks", null);
            builder.create().show();
        }
    }
如果任何pdf阅读器应用程序不可用,则此代码是从android market下载pdf阅读器,但请确保您的设备已预安装了android market应用程序。所以我想在android设备上试试,而不是在emulator上试试。

与iOS设备不同,许多(或者可能大多数)android设备没有默认的PDF查看器。这就是为什么你会得到例外。没有向正确的IntentFilter注册任何意图

另请参见另一个SO问题:


解决方案很简单:安装一个类似Google Play的PDF查看器。

手机上是否安装了任何第三方api来读取PDF????
    File file = new File(“/sdcard/read.pdf”);

Intent intent = new Intent(Intent.ACTION_VIEW);

intent.setDataAndType(Uri.fromFile(file),”application/pdf”);

intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);

startActivity(intent);