我正在寻找Android中的UI控件生成器。我有一个Web服务，它将提供创建表单类型的信息。该Web服务将告诉我该表单上需要的所有控件（可以是 TextView ， RadioButton ， CheckBox ， Spinner 等）和左/右位置wrt其他控件。
为此，我需要编写一个泛型类，它将返回我将从Web服务获得的该控件的对象。泛型类将有一个返回 RelativeLayout.LayoutParams 的函数，比如，alignToLeft（generic controlObject，int），其中第一个arg是该控件的对象，第二个arg是alignToLeft的引用控件的id /正确的位置。然后使用 addView 和 addRule （参数）将该控件添加到 RelativeLayout 。
我的问题是我如何创建一个新的控件实例并将其传递给一个函数，添加参数规则并将其添加到视图中？
答案 0 :(得分：0)
public class DynamicDesignMainActivity extends Activity {
LinearLayout main_layout;
jsonparser json_parser=null;
String jsonurl="URL STRING";
ProgressDialog progress_dialog;
JSONObject json_object_main;
private static final String TAG_NAME_MAIN="name";
private static final String TAG_JOBTYPE ="jobtype";
private static final String TAG_SECTION="sections";
private static final String TAG_SEC_1="sec-1";
private static final String TAG_NAME_MIDDEL="name";
private static final String TAG_OPTIONS="options";
private static final String TAG_NAME_INNER="name";
private static final String TAG_ID="id";
private static final String TAG_VALUES="values";
private static final String TAG_YES="yes";
private static final String TAG_NO="no";
private static final String TAG_TYPE="type";
private static final String TAG_ADDITIONAL_NOTE="additional_note";
class AsynctaskOperation extends AsyncTask<String, String, String>
{
Context context;
String json_string;
public AsynctaskOperation(Context con) {
// TODO Auto-generated constructor stub
context=con;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
progress_dialog.show();
json_parser=new jsonparser();
}
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
json_string=json_parser.getJsonfromUrl(jsonurl);
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
progress_dialog.dismiss();
Toast.makeText(DynamicDesignMainActivity.this, json_string, Toast.LENGTH_LONG).show();
try {
json_object_main=new JSONObject(json_string);
String name_main=json_object_main.getString(TAG_NAME_MAIN);
String job_typew=json_object_main.getString(TAG_JOBTYPE);
JSONObject json_section=json_object_main.getJSONObject(TAG_SECTION);
JSONObject json_sec=json_section.getJSONObject(TAG_SEC_1);
String mid_name=json_sec.getString(TAG_NAME_MIDDEL);
main_layout=(LinearLayout)findViewById(R.id.main_LinearLayout);
JSONArray json_option=json_sec.getJSONArray(TAG_OPTIONS);
for(int i=0;i<json_option.length()-1;i++)
{
LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
LinearLayout linearlauout1=new LinearLayout(context);
linearlauout1.setOrientation(LinearLayout.VERTICAL);
linearlauout1.setLayoutParams(params);
LinearLayout linearlayout_question=new LinearLayout(context);
linearlayout_question.setLayoutParams(params);
TextView textview_question=new TextView(context);
textview_question.setLayoutParams(params);
LinearLayout linearlayout_option=new LinearLayout(context);
linearlayout_option.setOrientation(LinearLayout.VERTICAL);
linearlayout_option.setLayoutParams(params);
JSONObject jsonobject=json_option.getJSONObject(i);
String question_name=jsonobject.getString(TAG_NAME_INNER);
textview_question.setText(question_name);
String type=null;
type=jsonobject.getString(TAG_TYPE);
Log.i("TYPE",type);
JSONObject json_values=jsonobject.getJSONObject(TAG_VALUES);
String val1=json_values.getString(TAG_YES);
String val2=json_values.getString(TAG_NO);
RadioGroup rg=null;
String values[]={val1,val2};
if(type.equalsIgnoreCase("radio"))
{
RadioButton[] rb=new RadioButton[2];
rg=new RadioGroup(context);
rg.setOrientation(RadioGroup.HORIZONTAL);
for(int j=0;j<2;j++)
{
rb[j]=new RadioButton(context);
rb[j].setText(values[j]);
rg.addView(rb[j]);
}
}
main_layout.addView(linearlauout1);
linearlauout1.addView(linearlayout_question);
linearlauout1.addView(linearlayout_option);
linearlayout_question.addView(textview_question);
linearlayout_option.addView(rg);
}
Button btn_show=new Button(context);
btn_show.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
btn_show.setText("Show");
btn_show.setId(101);
btn_show.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case 101:
showAnswer(main_layout);
break;
default:
break;
}
}
});
main_layout.addView(btn_show);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dynamic_design_main);
progress_dialog=new ProgressDialog(this);
progress_dialog.setMessage("Loading...");
new AsynctaskOperation(this).execute();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.dynamic_design_main, menu);
return true;
}
public void showAnswer(ViewGroup parent)
{
//Log.i("Count",parent.getChildCount()+"");
for(int j=0;j<parent.getChildCount();j++)
{
View child= parent.getChildAt(j);
//Log.i("CALSS",child.getClass().toString());
if(child instanceof TextView)
{
Log.i("TEXT",((TextView)child).getText()+"");
}
else
{
ViewGroup group=(ViewGroup)child;
showAnswer(group);
}
}
}
}
public class jsonparser {
int code;
static InputStream is=null;
String json=null;
public jsonparser() {
// TODO Auto-generated constructor stub
}
public String getJsonfromUrl(String url)
{
StringBuilder builder=new StringBuilder();
DefaultHttpClient httpClient=new DefaultHttpClient();
HttpPost httppost=new HttpPost(url);
try {
HttpResponse httpResponse=httpClient.execute(httppost);
code=httpResponse.getStatusLine().getStatusCode();
if(code==200)
{
HttpEntity httpentity=httpResponse.getEntity();
is=httpentity.getContent();
BufferedReader br=new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
String line=null;
while((line=br.readLine())!=null)
{
builder.append(line+"\n");
}
is.close();
}
json=builder.toString();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return json;
}
}