Question

Im trying to make a simple program, that saves and retrieves string using SharedPreferences. App normally loads, but if i click button, app falls. I have no idea what is wrong.
Here is the code:

Shared.java

package com.example.sharedpreferences;
import android.content.Context;
import android.content.SharedPreferences;
public class Shared {
    SharedPreferences prefe;
    SharedPreferences.Editor editor;
    Context mycontext;
    public Shared(Context context){
        mycontext = context;
        prefe = mycontext.getSharedPreferences("Preference", 0);
        editor = prefe.edit();
    }
    public void setpref(String name, String value){
        editor.putString(name, value);
        editor.commit();
    }
    public String getvalue(String name){
        return prefe.getString(name, "Nothing!");       
    }
}

MainActivity.java

package com.example.sharedpreferences;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity {
    Shared preferences;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        preferences = new Shared(getApplicationContext());  
    }

    public void btn_send(View button){
        TextView name = (TextView)findViewById(R.id.name2);
        TextView value = (TextView)findViewById(R.id.value2);
        String names = (String) name.getText();
        String values = (String) value.getText();
        preferences.setpref(names, values);
    }
    public void btn_read(View button){
        TextView name = (TextView)findViewById(R.id.name2);
        TextView value = (TextView)findViewById(R.id.value2);
        String names = (String) name.getText();
        String values = preferences.getvalue(names);
        value.setText(values);
    }
}

Thanks!

Answer 1

It seems that the error is caused by your casting Char sequence to String. You may use String superString = fromTextEdit.getText().toString(); instead.