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POHow can I Json (or Gson) a class like "objects to string" and after "string to objects"
 

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  1. POHow can I Json (or Gson) a class like "objects to string" and after "string to objects"
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    <p>My question is about an error occurred when I use my followed class:</p> <pre><code>public class ClassePai { private int ID; private String Nome; private ArrayList&lt;ClasseFilho&gt; listaParentes; public ClassePai( int id, String nome){ this.ID = id; this.Nome = nome; listaParentes = new ArrayList&lt;ClasseFilho&gt;(); } public void addParente(ClasseFilho classeFilho) { listaParentes.add(classeFilho); } public ClasseFilho getParente( int index ){ return listaParentes.get(index); } public int length(){ return listaParentes.size(); } public String Nome(){ return this.Nome; } public int ID(){ return this.ID; } } </code></pre> <p>and this "son" class:</p> <pre><code>public class ClasseFilho { private String Nome; private String Grau; public ClasseFilho( String nome, String grau ){ this.Nome = nome; this.Grau = grau; } public String Nome(){ return this.Nome; } public String Grau(){ return this.Grau; } } </code></pre> <p>This is my Activity:</p> <pre><code>public class TesteClasseActivity extends Activity { private ClassePai cp; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); cp = new ClassePai( 1, "Junior" ); cp.addParente( new ClasseFilho( "Vinicius", "filho" ) ); cp.addParente( new ClasseFilho( "Luciene", "namorada" ) ); //old call returning error //Toast.makeText(getApplicationContext(), cp.length(), Toast.LENGTH_SHORT).show(); Toast.makeText(getApplicationContext(), String.valueOf( cp.length() ), Toast.LENGTH_SHORT).show(); cp.addParente( new ClasseFilho( "Veraldo", "pai" ) ); cp.addParente( new ClasseFilho( "Sônia", "mãe" ) ); Toast.makeText(getApplicationContext(), String.valueOf( cp.length() ), Toast.LENGTH_SHORT).show(); ( (TextView) findViewById(R.id.edit) ).setText( cp.Nome() ); Button bt = (Button) findViewById(R.id.button); bt.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { Toast.makeText(getApplicationContext(), cp.getParente(1).Nome(), Toast.LENGTH_SHORT).show(); } }); //my try of doing this, but don't work JSONObject obj = new JSONObject(); obj.put("teste", cp); // BUT unfortunatelly // // obj.toString() returns this: // // {"teste":"my.package.name.ClassePai@40516650"} // // BUT... //wondering on net, I've deceided to try Gson: //first part: object to string Gson obj = new Gson(); obj.toJson(cp); String obj_in_xml = obj.toString(); Toast.makeText( getApplicationContext() , obj_in_xml, Toast.LENGTH_SHORT).show(); //no error, appear works fine, but... //second part: string to object Gson obj2 = new Gson(); ClassePai new_cp = obj2.fromJson( obj_in_xml, ClassePai.class); Toast.makeText( getApplicationContext() , new_cp.Nome(), Toast.LENGTH_SHORT).show(); //give me an error com.google.gson.stream.MalformedJsonException //and I could't find my properties in obj.toString(), but only codes like: // //adapter=com.google.gson.internal.bind.TypeAdapters$7@40529278] // // and don't find any of the object's string properties in the obj.toString() string // // what I'm doing wrong???? } } </code></pre> <p>How can I do to save this object with children in a text format, and after load from String to the objects again?</p> <p>Please help me!!!</p>
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    1. PTQuestion
    1. USalijunior
    1. USalijunior
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    1. This table or related slice is empty.
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    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COPost your stacktrace. Or even better: read it yourself. Your question is answered there in clear text with 90% probability
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      1. POHow can I Json (or Gson) a class like "objects to string" and after "string to objects"
      1. USKonstantin Pribluda
    2. COYeah, please paste the logcat message, and point to the line that is throwing the exception.
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      1. POHow can I Json (or Gson) a class like "objects to string" and after "string to objects"
      1. USOvidiu Latcu
    3. CO04-03 14:45:36.543: E/AndroidRuntime(262): FATAL EXCEPTION: main 04-03 14:45:36.543: E/AndroidRuntime(262): java.lang.RuntimeException: Unable to start activity ComponentInfo{br.junior.testeclasse/br.junior.testeclasse.TesteClasseActivity}: android.content.res.Resources$NotFoundException: String resource ID #0xa 04-03 14:45:36.543: E/AndroidRuntime(262): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) This you want?
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      1. POHow can I Json (or Gson) a class like "objects to string" and after "string to objects"
      1. USalijunior
 

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