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申し訳ありませんが、私はAndroidにかなり慣れていないので、ご容赦ください。JSON の読み込み中に表示されるスプラッシュ画面をセットアップしようとしています。アプリを起動すると、スプラッシュ画面が最初に数秒間表示され、その後クラッシュします。その後、アプリを起動しようとすると、スプラッシュ画面を表示することさえせずにクラッシュします。

BaseActivity.java から JSONTask クラスを取得します。

    public class RetreiveJSONTask extends AsyncTask<String, Void, String> {

    protected String doInBackground(String... urls) {
        Log.d("RetrieveJSONTask", "Begin fetching text.");
        return fetchJSON(urls[0]);
    }

    protected void onPostExecute(String JSON) {

    }

FetchJSON メソッド:

public String fetchJSON(String URL) {
    StringBuilder builder = new StringBuilder();
    AndroidHttpClient client = AndroidHttpClient.newInstance("Android");
    HttpGet httpGet = new HttpGet(URL);
    // Download JSON file from LocalResearch
    try {
        HttpResponse response = client.execute(httpGet);
        StatusLine statusLine = response.getStatusLine();
        int statusCode = statusLine.getStatusCode();
        if (statusCode == 200) {
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(content));
            String line;
            // Write line-by-line to StringBuilder
            while ((line = reader.readLine()) != null) 
            {
                Log.d(this.toString(), line);
                builder.append(line);
            }
        } else {
            Log.e(this.toString(), URL );
            Log.e(this.toString(), "Failed to download file");
        }
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    if (client != null)
        client.close();
    return builder.toString();
}

SplashActivity onCreate メソッド:

public static ArrayList<Item> downloadedItems = new ArrayList<Item>();

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);

    new RetreiveJSONTask() {


        protected void onPostExecute(String JSON)
        {
            downloadedItems = parseJSON ( JSON );

            Intent i = new Intent(SplashActivity.this, MagazinePagesActivity.class);
            startActivity(i);

            // Closes the splash screen
            finish();
        }
    }.execute(sourceURL());
}

最初のクラッシュのエラー ログ:

10-15 19:43:13.504: D/RetrieveJSONTask(769): Begin fetching text.
10-15 19:43:13.673: V/SlidingMenu(769): setting padding!
10-15 19:43:13.744: D/libEGL(769): loaded /system/lib/egl/libEGL_emulation.so
10-15 19:43:13.754: D/(769): HostConnection::get() New Host Connection established 0x2a0ef958, tid 769
10-15 19:43:13.793: D/libEGL(769): loaded /system/lib/egl/libGLESv1_CM_emulation.so
10-15 19:43:13.804: D/libEGL(769): loaded /system/lib/egl/libGLESv2_emulation.so
10-15 19:43:13.874: W/EGL_emulation(769): eglSurfaceAttrib not implemented
10-15 19:43:13.884: D/OpenGLRenderer(769): Enabling debug mode 0
10-15 19:43:13.984: V/CustomViewBehind(769): behind INVISIBLE
10-15 19:43:13.984: W/View(769): requestLayout() improperly called by android.widget.ListView{417003e0 VFED.VC. ......ID 0,0-366,738 #102000a android:id/list} during layout: running second layout pass
10-15 19:43:15.644: W/dalvikvm(769): threadid=11: thread exiting with uncaught exception (group=0x41465700)
10-15 19:43:15.794: E/AndroidRuntime(769): FATAL EXCEPTION: AsyncTask #1
10-15 19:43:15.794: E/AndroidRuntime(769): java.lang.RuntimeException: An error occured     while executing doInBackground()
10-15 19:43:15.794: E/AndroidRuntime(769):  at     android.os.AsyncTask$3.done(AsyncTask.java:299)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.util.concurrent.FutureTask.run(FutureTask.java:239)
10-15 19:43:15.794: E/AndroidRuntime(769):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.lang.Thread.run(Thread.java:841)
10-15 19:43:15.794: E/AndroidRuntime(769): Caused by: java.lang.NullPointerException
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.net.URI.parseURI(URI.java:353)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.net.URI.<init>(URI.java:204)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.net.URI.create(URI.java:725)
10-15 19:43:15.794: E/AndroidRuntime(769):  at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:75)
10-15 19:43:15.794: E/AndroidRuntime(769):  at com.dailybruin.bruinframework.base.BaseActivity.fetchJSON(BaseActivity.java:112)
10-15 19:43:15.794: E/AndroidRuntime(769):  at com.dailybruin.bruinframework.base.BaseActivity$RetreiveJSONTask.doInBackground(BaseActivity.java:163)
10-15 19:43:15.794: E/AndroidRuntime(769):  at com.dailybruin.bruinframework.base.BaseActivity$RetreiveJSONTask.doInBackground(BaseActivity.java:1)
10-15 19:43:15.794: E/AndroidRuntime(769):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
10-15 19:43:15.794: E/AndroidRuntime(769):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
10-15 19:43:15.794: E/AndroidRuntime(769):  ... 4 more

前もって感謝します！

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1 に答える 1

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fetchJSON に渡された URL が null のようです。

于 2013-10-16T03:35:47.960 に答える