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我正在阅读资产文件夹中的 .OBJ 文件。但是我在阅读文件时遇到了异常。即使我在 Eclipse 上调试项目，但我能找到原因。

请帮我

提前致谢。

/**
 * Load Object Asynchronous.
 * @author Ajay
 */
private class ObjLoaderAsync extends AsyncTask<Void, Void, Void> {

    private ProgressDialog progressDialog;

    @Override
    protected void onPreExecute() {
        try {
            progressDialog = new ProgressDialog(localContext);
            progressDialog.setTitle(localContext
                    .getString(R.string.app_name));
            progressDialog.setMessage(localContext
                    .getString(R.string.please_wait));
            progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            progressDialog.setCancelable(true);
            progressDialog.show();
        } catch (Exception e) {
        }
    }

    @Override
    protected Void doInBackground(Void... arg0) {
        try {
            mr[getCurrentPosition()] = new ModelRenderer(localContext,
                    localContext.getAssets().open(RendererView.objName));
        } catch (java.io.IOException e) {
            Log.v("DemoRendererView", "loading model: " + e);
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void param) {
        try {
            progressDialog.cancel();
        } catch (Exception e) {

        }
    }
}

public ModelRenderer(Context paramContext, InputStream localFileInputStream) throws FileNotFoundException {
    ModelStaticClassTransfer.value = -777.0F;
    while (true) {
        try {
            i = localFileInputStream.read();
            if (i != -1)
                continue;
            localFileInputStream.close();
            if ((char) i == 'v') {
                i = localFileInputStream.read();
                if ((char) i != ' ')
                    continue;
                this.verticeCounter = (1 + this.verticeCounter);
                continue;
            }
            if ((char) i == 'f') {
                i = localFileInputStream.read();
                if ((char) i != ' ')
                    continue;
                this.indexCounter = (1 + this.indexCounter);
                continue;
            }
            int j = localFileInputStream.read();
            i = j;
        } catch (IOException localIOException) {
            localIOException.printStackTrace();
            return;
        }
    }
}

错误追踪

09-12 12:54:57.516: E/AndroidRuntime(29949): FATAL EXCEPTION: AsyncTask #2
09-12 12:54:57.516: E/AndroidRuntime(29949): java.lang.RuntimeException: An error occured while executing doInBackground()
09-12 12:54:57.516: E/AndroidRuntime(29949):    at android.os.AsyncTask$3.done(AsyncTask.java:278)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.lang.Thread.run(Thread.java:856)
09-12 12:54:57.516: E/AndroidRuntime(29949): Caused by: java.lang.NullPointerException: asset
09-12 12:54:57.516: E/AndroidRuntime(29949):    at android.content.res.AssetManager.readAssetChar(Native Method)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at android.content.res.AssetManager.access$200(AssetManager.java:35)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at android.content.res.AssetManager$AssetInputStream.read(AssetManager.java:548)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at com.amplimesh.models.ModelRenderer.<init>(ModelRenderer.java:64)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at com.amplimesh.models.ModelGLRenderer$ObjLoaderAsync.doInBackground(ModelGLRenderer.java:138)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at com.amplimesh.models.ModelGLRenderer$ObjLoaderAsync.doInBackground(ModelGLRenderer.java:1)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at android.os.AsyncTask$2.call(AsyncTask.java:264)
09-12 12:54:57.516: E/AndroidRuntime(29949):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-12 12:54:57.516: E/AndroidRuntime(29949):    ... 5 more
4

3 回答 3

2

我认为您误解了continue关键字的含义。这个关键字意味着循环立即跳转到下一次迭代，而不执行循环块中的其余代码。

在您的情况下，这意味着此代码

i = localFileInputStream.read();
if (i != -1)
    continue;
localFileInputStream.close();
if ((char) i == 'v') {
    i = localFileInputStream.read();

关闭 inputStream，然后尝试从中读取。由于所有的继续，你的算法不是很清楚，所以我不能真正告诉你如何解决这个问题。

于 2013-09-12T07:49:58.017 回答
0 
 @Override
    protected void onPostExecute(Void param) {
        try {
            mr[getCurrentPosition()] = new ModelRenderer(localContext,
                    localContext.getAssets().open(RendererView.objName));
             dialog.cancle();
        } catch (java.io.IOException e) {
            Log.v("DemoRendererView", "loading model: " + e);
        }
    }

请检查这个...

于 2013-09-12T07:35:34.527 回答
0

你从

try {
        i = localFileInputStream.read();
        if (i != -1)
            continue;
        localFileInputStream.close();

因此，您正在关闭流，然后尝试再次从中读取。catch此外，您在无限循环中运行它并仅在该部分中退出它。读完后考虑关闭流。

于 2013-09-12T12:05:43.423 回答