所以我从启用 API 的网站解析 JSON 数据，它需要通过 APIKEY 进行身份验证，我的问题是我试图解析数据然后将其插入 UI 上的 TextViews。我当前的代码以前使用 aHashMap和 aListView但是现在我试图将其更改为仅将数据填充到TextViews. 目前，我已经开始更改代码，现在我正在RunTimeExceptions使用我当前的代码。任何帮助将不胜感激。
问题解决了
public class ParseMoreDetails extends Activity {
private Context context;
private static String url = "https://api.company.com/api/systems?";
private static final String TAG_SYSTEM = "systems";
private static final String TAG_SYSTEM_ID = "system_id";
private static final String TAG_CITY = "city";
private static final String TAG_STATE = "state";
private static final String TAG_SYSTEM_NAME = "system_name";
private static final String TAG_SYSTEM_PUBLIC_NAME = "system_public_name";
private static final String TAG_STATUS = "status";
TextView textView;
TextView textView2;
TextView textView3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView2);
textView2 = (TextView) findViewById(R.id.TextView01);
textView3 = (TextView) findViewById(R.id.TextView03);
new ProgressTask(ParseMoreDetails.this).execute();
}
private class ProgressTask extends AsyncTask<String, Void, ArrayList<String>> {
private ProgressDialog dialog;
ArrayList<String> arrfortextviews;
private ParseMoreDetails activity;
// private List<Message> messages;
public ProgressTask(ParseMoreDetails parseMoreDetails) {
this.activity = parseMoreDetails;
context = parseMoreDetails;
dialog = new ProgressDialog(context);
}
/** progress dialog to show user that the backup is processing. */
/** application context. */
private Context context;
protected void onPreExecute() {
this.dialog.setMessage("Progress start");
this.dialog.show();
}
@Override
protected void onPostExecute(ArrayList<String> success) {
if(arrfortextviews.size() >0){
textView.setText(success.get(0));
textView2.setText(success.get(1));
textView3.setText(success.get(2));
}
if (dialog.isShowing()) {
dialog.dismiss();
}
}
protected ArrayList<String> doInBackground(final String... args) {
JSONParser jParser = new JSONParser();
arrfortextviews=new ArrayList<String>();
// Using APIKEY from strings.xml
String apikey = getString(R.string.apikey);
// getting JSON string from URL
JSONArray json = jParser.getJSONFromUrl(url + "&key=" + apikey);
for (int i = 0; i < json.length(); i++) {
try {
JSONObject c = json.getJSONObject(i);
String vcolor = c.getString(TAG_SYSTEM_ID);
String vfuel = c.getString(TAG_CITY);
String vtread = c.getString(TAG_STATE);
arrfortextviews.add(vcolor);
arrfortextviews.add(vfuel);
arrfortextviews.add(vtread);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return arrfortextviews;
}
}
布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="System ID: " />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="..." />
</LinearLayout>
</FrameLayout>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.00" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<TextView
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="City:" />
<TextView
android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="..." />
</LinearLayout>
</FrameLayout>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.00" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<TextView
android:id="@+id/TextView04"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="State:" />
<TextView
android:id="@+id/TextView03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="..." />
</LinearLayout>
</FrameLayout>
</LinearLayout>
当前错误
- RuntimeException - NullPointerException
- 泄露的窗口 com.android.internal.policy.impl.PhoneWindow$DecorView
LogCat - 更新
05-01 10:27:47.040: E/AndroidRuntime(28236): FATAL EXCEPTION: AsyncTask #1
05-01 10:27:47.040: E/AndroidRuntime(28236): java.lang.RuntimeException: An error occured while executing doInBackground()
05-01 10:27:47.040: E/AndroidRuntime(28236): at android.os.AsyncTask$3.done(AsyncTask.java:299)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
05-01 10:27:47.040: E/AndroidRuntime(28236): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.lang.Thread.run(Thread.java:856)
05-01 10:27:47.040: E/AndroidRuntime(28236): Caused by: java.lang.NullPointerException
05-01 10:27:47.040: E/AndroidRuntime(28236): at com.jitesh.androidjsonparser.ParseMoreDetails$ProgressTask.doInBackground(ParseMoreDetails.java:116)
05-01 10:27:47.040: E/AndroidRuntime(28236): at com.jitesh.androidjsonparser.ParseMoreDetails$ProgressTask.doInBackground(ParseMoreDetails.java:1)
05-01 10:27:47.040: E/AndroidRuntime(28236): at android.os.AsyncTask$2.call(AsyncTask.java:287)
05-01 10:27:47.040: E/AndroidRuntime(28236): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
05-01 10:27:47.040: E/AndroidRuntime(28236): ... 5 more
05-01 10:27:55.035: I/Choreographer(28236): Skipped 464 frames! The application may be doing too much work on its main thread.
05-01 10:27:55.210: E/WindowManager(28236): Activity com.jitesh.androidjsonparser.ParseMoreDetails has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4285c818 that was originally added here
05-01 10:27:55.210: E/WindowManager(28236): android.view.WindowLeaked: Activity com.jitesh.androidjsonparser.ParseMoreDetails has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4285c818 that was originally added here
05-01 10:27:55.210: E/WindowManager(28236): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:402)
05-01 10:27:55.210: E/WindowManager(28236): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:311)
05-01 10:27:55.210: E/WindowManager(28236): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
05-01 10:27:55.210: E/WindowManager(28236): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
05-01 10:27:55.210: E/WindowManager(28236): at android.view.Window$LocalWindowManager.addView(Window.java:554)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.Dialog.show(Dialog.java:277)
05-01 10:27:55.210: E/WindowManager(28236): at com.jitesh.androidjsonparser.ParseMoreDetails$ProgressTask.onPreExecute(ParseMoreDetails.java:86)
05-01 10:27:55.210: E/WindowManager(28236): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
05-01 10:27:55.210: E/WindowManager(28236): at android.os.AsyncTask.execute(AsyncTask.java:534)
05-01 10:27:55.210: E/WindowManager(28236): at com.jitesh.androidjsonparser.ParseMoreDetails.onCreate(ParseMoreDetails.java:63)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.Activity.performCreate(Activity.java:5206)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.ActivityThread.access$600(ActivityThread.java:140)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
05-01 10:27:55.210: E/WindowManager(28236): at android.os.Handler.dispatchMessage(Handler.java:99)
05-01 10:27:55.210: E/WindowManager(28236): at android.os.Looper.loop(Looper.java:137)
05-01 10:27:55.210: E/WindowManager(28236): at android.app.ActivityThread.main(ActivityThread.java:4898)
05-01 10:27:55.210: E/WindowManager(28236): at java.lang.reflect.Method.invokeNative(Native Method)
05-01 10:27:55.210: E/WindowManager(28236): at java.lang.reflect.Method.invoke(Method.java:511)
05-01 10:27:55.210: E/WindowManager(28236): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
05-01 10:27:55.210: E/WindowManager(28236): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
05-01 10:27:55.210: E/WindowManager(28236): at dalvik.system.NativeStart.main(Native Method)