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如果设备有任何 pdfreader，我想从 raw 文件夹中读取 pdf 文件。这是我的代码：

 Intent intent = new Intent(Intent.ACTION_VIEW,
              Uri.parse("android.resource://com.powergroupbd.pdfreader/raw" + R.raw.androidtasksmwp));

    intent.setType("application/pdf");
    PackageManager pm = getPackageManager();
    List<ResolveInfo> activities = pm.queryIntentActivities(intent, 0);
    if (activities.size() > 0) {
        startActivity(intent);
    } else {
       Toast.makeText(getApplicationContext(), "No pdfreader  found", Toast.LENGTH_LONG).show();
    }

但是当我运行这个项目时，它显示错误。这是 logcat 结果：

06-21 02:05:04.408: W/dalvikvm(7763): threadid=1: thread exiting with uncaught exception (group=0x40015560)
06-21 02:05:04.418: E/AndroidRuntime(7763): FATAL EXCEPTION: main
06-21 02:05:04.418: E/AndroidRuntime(7763): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.qo.android.htcgep/com.qo.android.am.pdflib.app.RenderScreen}: java.lang.NullPointerException
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.os.Looper.loop(Looper.java:130)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.main(ActivityThread.java:3683)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at java.lang.reflect.Method.invokeNative(Native Method)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at java.lang.reflect.Method.invoke(Method.java:507)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at dalvik.system.NativeStart.main(Native Method)
06-21 02:05:04.418: E/AndroidRuntime(7763): Caused by: java.lang.NullPointerException
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.qo.android.am.pdflib.app.RenderScreen.onNewIntent(Unknown Source)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.qo.android.am.pdflib.app.RenderScreen.onCreate(Unknown Source)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
06-21 02:05:04.418: E/AndroidRuntime(7763):  ... 11 more
06-21 02:05:04.418: W/ActivityManager(96):   Force finishing activity com.qo.android.htcgep/com.qo.android.am.pdflib.app.RenderScreen

我做错了什么？请帮忙..：（

4

2 回答 2

1

我从来没有尝试过像你那样做，但我通过以下过程非常成功地使用了原始资源：

  1. 通过获取和 InputStream 获取资源

    fileResourceStream = Activity.getResources().openRawResource(R.raw.androidclient));//R文件为你引用资源id。在您的情况下，它将是 R.raw.androidtasksmwp。

  2. 使用此 InputStream 我将资源文件复制（通常在安装应用程序后）到设备内存或 SD 卡（决定权在您手中）。可以设计这样的东西：

    BufferedInputStream bIS = new BufferedInputStream(
fileResourceStream);
try {
        BufferedOutputStream bOS = new BufferedOutputStream(
        new FileOutputStream(Globals.applicationDirPath
                + Globals.exeFileName, false));

        int BUFFER_SIZE = 4096;
        byte[] buff = new byte[BUFFER_SIZE];
        int bytesRead = bIS.read(buff, 0, BUFFER_SIZE);
        while (bytesRead >= 0) {
            bOS.write(buff, 0, bytesRead);
            bytesRead = bIS.read(buff, 0, BUFFER_SIZE);
        }
        bIS.close();
        bOS.flush();
        bOS.close();
}// try {
catch (Exception e) {
        Globals.log("Exception in checkAndCopyClientToMemory."
        + e.toString());
}

  3. 在任何应用程序中/出于任何目的打开复制的文件作为文件。

于 2012-06-20T22:13:30.133 回答
0

我认为您可能在“.../raw”之后缺少一个“/”，因此 uri 不正确。

Uri.parse("android.resource://com.powergroupbd.pdfreader/raw" + R.raw.androidtasksmwp)

但是我不确定您是否可以从像这样的外部包中访问资源，您可能需要将其复制到 sdcard 然后有意打开它

于 2012-06-20T21:28:55.927 回答