我尝试在TextView中添加LinearLayout。但它有点复杂，因为我需要以编程方式创建所有应用程序并以编程方式添加元素。我解析了一个json文件，我从他那里得到了View：
JSONParser.java：
public class JSONParser extends Activity {
private JSONObject myjsonobj = null;
// Map<String, String> jsonresult = new HashMap<String, String>();
// private JSONArray myinterface = null;
public JSONParser(String file) throws IOException {
file = "assets/JsonTest.txt";
InputStream is = this.getClass().getClassLoader().getResourceAsStream(file);
StringBuffer sb = new StringBuffer();
try {
BufferedReader buf = new BufferedReader(new InputStreamReader(is,
"UTF-8"));
String temp;
while ((temp = buf.readLine()) != null)
sb.append(temp);
} catch (IOException e) {
e.printStackTrace();
} finally { }
try {
Log.e("Parser JSON", "Parser JSON OK");
myjsonobj = new JSONObject(sb.toString());
} catch (JSONException e) {
e.printStackTrace();
}
Log.e("OBJSON", myjsonobj.toString());
}
public ClassicView getClassicViewWithId(int id, Context context) throws JSONException {
JSONArray myView = myjsonobj.getJSONObject("interface").getJSONArray("View");
for (int i = 0; i < myView.length(); i++) {
if (myView.getJSONObject(i).getInt("id") == id) {
Log.e("IDVIEW", myView.getJSONObject(i).getString("id"));
ClassicView myClassicView = new ClassicView(myView.getJSONObject(i).getInt("id"));
classicSetLabel(myView.getJSONObject(i).getJSONArray("Label"), myClassicView, context);
return myClassicView;
}
}
return null;
}
ClassicView.java：
public class ClassicView extends Activity {
public int myid;
public ClassicView() {
}
public ClassicView(int id){
super();
myid = id;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.linearlayout);
LinearLayout ll = (LinearLayout) findViewById(R.id.linearlayout2);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams( new ViewGroup.MarginLayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
setContentView(ll);
}
}
我的SetClassicLabel课程中有我的函数JSONParser。我想添加未定义的TextView个数。我在json文件中读取了这个数字。我想在TextView中添加ClassicView，但我不知道该怎么做。我尝试了这个，但它不起作用：
public RelativeLayout.LayoutParams setPosition(int positionX,int positionY){
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(positionX);
params.addRule(positionY);
return params;
}
public void classicSetLabel(JSONArray myArrayLabel, ClassicView classicView, Context context) throws JSONException {
Log.e("@@@@@WARNING TEXTLABEL :", "classicSetLabelErreur1");
Log.e("@@@@@WARNING TEXTLABEL :", "classicSetLabelErreur2");
for (int i = 0; i < myArrayLabel.length(); i++) {
Log.e("CLASSICVIEW", classicView.toString());
TextView myTextView = new TextView(context);
LinearLayout myLayout = new LinearLayout(context);
myTextView.append(myArrayLabel.getJSONObject(i).getString("text"));
myLayout.addView(myTextView, setPosition(RelativeLayout.CENTER_HORIZONTAL,RelativeLayout.CENTER_VERTICAL));
Log.e("@@@@@WARNING TEXTLABEL :", myArrayLabel.getJSONObject(i).getString("text"));
Log.e("@@@@@WARNING TEXTPOS_X", myArrayLabel.getJSONObject(i).getString("position_x"));
Log.e("@@@@@WARNING TEXTPOS_Y", myArrayLabel.getJSONObject(i).getString("position_y"));
setContentView(myLayout);
}
}
MainActivity.java ：
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
JSONParser jParser = null;
try {
jParser = new JSONParser("JsonTest.txt");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
ClassicView view = jParser.getClassicViewWithId(0, MainActivity.this);
//Log.e("idVIEWMAIN :", msg)
Intent intent = new Intent(MainActivity.this, view.getClass());
startActivity(intent);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
这是我的 Logcat ：
11-27 06:34:50.878: E/IDVIEW(30402): 0
11-27 06:34:50.878: E/@@@@@WARNING TEXTLABEL :(30402): classicSetLabelErreur1
11-27 06:34:50.888: E/@@@@@WARNING TEXTLABEL :(30402): classicSetLabelErreur2
11-27 06:34:50.888: E/CLASSICVIEW(30402): com.fchps.bya.classicview.ClassicView@41bdee80
11-27 06:34:50.898: E/@@@@@WARNING TEXTLABEL :(30402): bonjour comment ca va ?
11-27 06:34:50.898: E/@@@@@WARNING TEXTPOS_X(30402): 200
11-27 06:34:50.898: E/@@@@@WARNING TEXTPOS_Y(30402): 400
11-27 06:34:50.898: D/AndroidRuntime(30402): Shutting down VM
11-27 06:34:50.898: W/dalvikvm(30402): threadid=1: thread exiting with uncaught exception (group=0x411d32a0)
11-27 06:34:50.898: E/AndroidRuntime(30402): FATAL EXCEPTION: main
11-27 06:34:50.898: E/AndroidRuntime(30402): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fchps.bya/com.fchps.bya.MainActivity}: java.lang.NullPointerException
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2081)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2106)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.ActivityThread.access$700(ActivityThread.java:134)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1217)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.os.Handler.dispatchMessage(Handler.java:99)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.os.Looper.loop(Looper.java:137)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.ActivityThread.main(ActivityThread.java:4856)
11-27 06:34:50.898: E/AndroidRuntime(30402): at java.lang.reflect.Method.invokeNative(Native Method)
11-27 06:34:50.898: E/AndroidRuntime(30402): at java.lang.reflect.Method.invoke(Method.java:511)
11-27 06:34:50.898: E/AndroidRuntime(30402): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
11-27 06:34:50.898: E/AndroidRuntime(30402): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
11-27 06:34:50.898: E/AndroidRuntime(30402): at dalvik.system.NativeStart.main(Native Method)
11-27 06:34:50.898: E/AndroidRuntime(30402): Caused by: java.lang.NullPointerException
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.Activity.setContentView(Activity.java:1921)
11-27 06:34:50.898: E/AndroidRuntime(30402): at com.fchps.bya.json.JSONParser.classicSetLabel(JSONParser.java:107)
11-27 06:34:50.898: E/AndroidRuntime(30402): at com.fchps.bya.json.JSONParser.getClassicViewWithId(JSONParser.java:71)
11-27 06:34:50.898: E/AndroidRuntime(30402): at com.fchps.bya.MainActivity.onCreate(MainActivity.java:32)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.Activity.performCreate(Activity.java:5047)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
11-27 06:34:50.898: E/AndroidRuntime(30402): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045)
11-27 06:34:50.898: E/AndroidRuntime(30402): ... 11 more
有人明白我想做什么，可以向我解释我的错误吗？
谢谢：）
答案 0 :(得分：0)
请你这样试试：
LinearLayout layout = ... // Your linear layout.
ListAdapter adapter = ... // Your adapter. Add the JSON text in the list-adapter
//( populate the adapter using you json parser)
for (int i = 0; i < adapter.getCount(); i++) {
View item = adapter.getView(i, null, null);
layout.addView(item);
}