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嗨，我正在制作一个在 android 中从给定 url 读取 pdf 的应用程序，然后将其存储在 sdcard 中，然后使用我的 android 设备中的 mupdf 阅读器打开它。

我的 logcat 中出现以下错误：

日志猫：

 02-15 05:47:10.276: E/AndroidRuntime(3134): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ohile.openpdf/com.ohile.openpdf.MainActivity}: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///mnt/sdcard/pdf/Read.pdf typ=application/pdf }
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.os.Handler.dispatchMessage(Handler.java:99)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.os.Looper.loop(Looper.java:137)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.ActivityThread.main(ActivityThread.java:5039)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at java.lang.reflect.Method.invokeNative(Native Method)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at java.lang.reflect.Method.invoke(Method.java:511)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at dalvik.system.NativeStart.main(Native Method)
        02-15 05:47:10.276: E/AndroidRuntime(3134): Caused by: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///mnt/sdcard/pdf/Read.pdf typ=application/pdf }
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1622)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Activity.startActivityForResult(Activity.java:3370)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Activity.startActivityForResult(Activity.java:3331)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Activity.startActivity(Activity.java:3566)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Activity.startActivity(Activity.java:3534)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at com.ohile.openpdf.MainActivity.showPdf(MainActivity.java:46)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at com.ohile.openpdf.MainActivity.onCreate(MainActivity.java:32)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Activity.performCreate(Activity.java:5104)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
        02-15 05:47:10.276: E/AndroidRuntime(3134):     ... 11 more

我写了以下java代码：

*下载文件.java *

public class DownloadFile {
    public static void downloadFile(String fileUrl, File directory)  {
        try {
            FileOutputStream f = new FileOutputStream(directory);
            URL u = new URL(fileUrl);
            HttpURLConnection c = (HttpURLConnection) u.openConnection();
            c.setRequestMethod("GET");
            c.setDoOutput(true);
            c.connect();
            InputStream in = c.getInputStream();
            byte []buffer = new byte[1024];
            int len = 0;
            while((len = in.read(buffer))>0) {
                f.write(buffer,0,len);
            }
            f.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

MainActivity.java

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String extStorageDirectory = Environment.getExternalStorageDirectory()
                .toString();
        File folder = new File(extStorageDirectory, "pdf");
        folder.mkdir();
        File file = new File(folder, "Read.pdf");
        try {
            file.createNewFile();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        DownloadFile.downloadFile("http://14.140.41.194/monali/i.pdf",
                file);

        showPdf();
    }

     public void showPdf()
     {
         File file = new File(Environment.getExternalStorageDirectory()+"/pdf/Read.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);
     }
}

有人可以帮我找出我的代码中的错误在哪里。？？？

4

1 回答 1

0 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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

        startActivity(intent);
    }
于 2013-02-15T06:09:00.077 回答