Java 将JSON解析为文本视图
因此，我要解析来自启用API的网站的JSON数据，这需要通过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TextView中。我当前的代码以前使用的是Java 将JSON解析为文本视图,java,android,json,parsing,textview,Java,Android,Json,Parsing,Textview,因此，我要解析来自启用API的网站的JSON数据，这需要通过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TextView中。我当前的代码以前使用的是HashMap和ListView，但现在我试图将其更改为只将数据填充到textview。目前，我已经开始重新修改代码，现在我的当前代码出现了RunTimeExceptions。任何帮助都将不胜感激 问题解决 公共类ParseMoreDetails扩展活动{ 私人语境； 专用静态字符串url=”https://api.co
HashMapListViewtextviewRunTimeExceptions公共类ParseMoreDetails扩展活动{
私人语境；
专用静态字符串url=”https://api.company.com/api/systems?";
私有静态最终字符串TAG_SYSTEM=“systems”；
私有静态最终字符串TAG\u SYSTEM\u ID=“SYSTEM\u ID”；
私有静态最终字符串TAG_CITY=“CITY”；
私有静态最终字符串标记_STATE=“STATE”；
私有静态最终字符串TAG\u SYSTEM\u NAME=“SYSTEM\u NAME”；
私有静态最终字符串TAG\u SYSTEM\u PUBLIC\u NAME=“SYSTEM\u PUBLIC\u NAME”；
私有静态最终字符串标记_STATUS=“STATUS”；
文本视图文本视图；
文本视图文本视图2；
文本视图文本视图3；
@凌驾
创建时受保护的void（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）；
新建ProgressTask（ParseMoreDetails.this）.execute（）；
}
私有类ProgressTask扩展了AsyncTask{
私人对话；
ArrayList ArrForTextView；
私人活动；
//私人列表消息；
公共进程任务（ParseMoreDetails ParseMoreDetails）{
this.activity=parseMoreDetails；
上下文=解析更多细节；
dialog=新建进度对话框（上下文）；
}
/**“进度”对话框，向用户显示备份正在处理*/
/**应用程序上下文*/
私人语境；
受保护的void onPreExecute（）{
this.dialog.setMessage（“进度开始”）；
this.dialog.show（）；
}
@凌驾
受保护的void onPostExecute（ArrayList成功）{
如果（arrfortextview.size（）>0）{
setText（success.get（0））；
textView2.setText（success.get（1））；
textView3.setText（success.get（2））；
}
if（dialog.isShowing（））{
dialog.dismise（）；
}
}
受保护的ArrayList doInBackground（最终字符串…args）{
JSONParser jParser=新的JSONParser（）；
arrfortextview=newarraylist（）；
//使用strings.xml中的APIKEY
String apikey=getString（R.String.apikey）；
//从URL获取JSON字符串
JSONArray json=jParser.getJSONFromUrl（url+“&key=“+apikey”）；
for（int i=0；i <?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>
- RuntimeException-NullPointerException
- 泄漏的Window com.android.internal.policy.impl.PhoneWindow$DecorView
05-01 10:27:47.040:E/AndroidRuntime（28236）：致命异常：AsyncTask#1
05-01 10:27:47.040:E/AndroidRuntime（28236）：java.lang.RuntimeException:执行doInBackground（）时出错
05-01 10:27:47.040:E/AndroidRuntime（28236）：在android.os.AsyncTask$3.done（AsyncTask.java:299）
05-01 10:27:47.040:E/AndroidRuntime（28236）：位于java.util.concurrent.FutureTask$Sync.innerSetException（FutureTask.java:273）
05-01 10:27:47.040:E/AndroidRuntime（28236）：位于java.util.concurrent.FutureTask.setException（FutureTask.java:124）
05-01 10:27:47.040:E/AndroidRuntime（28236）：在java.util.concurrent.FutureTask$Sync.innerRun（FutureTask.java:307）
05-01 10:27:47.040:E/AndroidRuntime（28236）：在java.util.concurrent.FutureTask.run（FutureTask.java:137）
05-01 10:27:47.040:E/AndroidRuntime（28236）：在android.os.AsyncTask$SerialExecutor$1.run（AsyncTask.java:230）
05-01 10:27:47.040:E/AndroidRuntime（28236）：位于java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1076）
05-01 10:27:47.040:E/AndroidRuntime（28236）：位于java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:569）
05-01 10:27:47.040:E/AndroidRuntime（28236）：在java.lang.Thread.run（Thread.java:856）处
05-01 10:27:47.040:E/AndroidRuntime（28236）：由以下原因引起：java.lang.NullPointerException
05-01 10:27:47.040:E/AndroidRuntime（28236）：位于com.jitesh.androidjsonparser.ParseMoreDetails$ProgressTask.doInBackground（ParseMoreDetails.java:116）
05-01 10:27:47.040:E/AndroidRuntime（28236）：位于com.jitesh.androidjsonparser.ParseMoreDetails$ProgressTask.doInBackground（ParseMoreDetails.java:1）
05-01 10:27:47.040:E/AndroidRuntime（28236）：在android.os.AsyncTask$2.call（AsyncTask.java:287）
05-01 10:27:47.040:E/AndroidRuntime（28236）：在java.util.concurrent.FutureTask$Sync.innerRun（FutureTask.java:305）
05-01 10:27:47.040:E/AndroidRuntime（28236）：…还有5个
05-01 10:27:55.035:I/Choreographer（28236）：跳过了464帧！应用程序可能在其主线程上做了太多工作。
05-01 10:27:55.210:E/WindowManager（28236）：Activity com.jitesh.androidjsonparser.ParseMoreDetails泄露了window com.android.internal.policy.impl.PhoneWindow$DecorView@
<?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>
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)
TextView textView = (TextView) findViewById(R.id.textView2); //<<< here
TextView textView2 = (TextView) findViewById(R.id.TextView01);//<<< here
TextView textView3 = (TextView) findViewById(R.id.TextView03);//<<< here
@Override
protected void onCreate(Bundle savedInstanceState) {
.....
TextView textView,textView2,textView3; //<<<declare here
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initialize all textViews here
textView = (TextView) findViewById(R.id.textView2);
textView2 = (TextView) findViewById(R.id.TextView01);
textView3 = (TextView) findViewById(R.id.TextView03);
......
// getting JSON string from URL
JSONArray json = jParser.getJSONFromUrl(url + "&key=" + apikey);
// getting JSON string from URL
JSONArray json = jParser.getJSONFromUrl(url + "key=" + apikey);