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POpassing from one intent to another
 

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    <p>i have one button n 6 radio buttons in activity. after getting input from edit text on click of button(search) it goes to another activity. below is my code</p> <pre><code>public void search(View v) { switch(v.getId()) { case R.id.button1: EditText et1= (EditText)findViewById(R.id.editText1); RadioButton r1 = (RadioButton) findViewById(R.id.radio0); RadioButton r2 = (RadioButton) findViewById(R.id.radio1); RadioButton r3 = (RadioButton) findViewById(R.id.radio2); RadioButton r4 = (RadioButton) findViewById(R.id.radio3); RadioButton r5 = (RadioButton) findViewById(R.id.radio4); RadioButton r6 = (RadioButton) findViewById(R.id.radio5); pin=et1.getText().toString(); if(pin.length()==0){ Toast.makeText(this, "Please provide Input!", Toast.LENGTH_SHORT).show(); return; } if(r1.isChecked()) { category="All"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r2.isChecked()) { category="Food"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r3.isChecked()) { category="Entertainment"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r4.isChecked()) { category="Shopping"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r5.isChecked()) { category="Health"; Intent i=new Intent(this,Details.class); startActivity(i); } else if (r6.isChecked()) { category="Services"; Intent i=new Intent(this,Details.class); startActivity(i); } break; } /*if(pin.length()!=0&amp;&amp;category.length()!=0) { Intent i=new Intent(this,Details.class); startActivity(i); }*/ } </code></pre> <p>is the above code correct?? while running force close happens when input given .but when no input the toast msg is displayed.</p> <p>the log cat is </p> <pre><code>09-29 23:56:25.706: E/AndroidRuntime(23196): FATAL EXCEPTION: main 09-29 23:56:25.706: E/AndroidRuntime(23196): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.yellowpages/com.yellowpages.Details}: java.lang.NullPointerException 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.ActivityThread.access$600(ActivityThread.java:123) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.os.Handler.dispatchMessage(Handler.java:99) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.os.Looper.loop(Looper.java:137) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.ActivityThread.main(ActivityThread.java:4424) 09-29 23:56:25.706: E/AndroidRuntime(23196): at java.lang.reflect.Method.invokeNative(Native Method) 09-29 23:56:25.706: E/AndroidRuntime(23196): at java.lang.reflect.Method.invoke(Method.java:511) 09-29 23:56:25.706: E/AndroidRuntime(23196): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 09-29 23:56:25.706: E/AndroidRuntime(23196): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 09-29 23:56:25.706: E/AndroidRuntime(23196): at dalvik.system.NativeStart.main(Native Method) 09-29 23:56:25.706: E/AndroidRuntime(23196): Caused by: java.lang.NullPointerException 09-29 23:56:25.706: E/AndroidRuntime(23196): at com.yellowpages.Dbpages.fetchRecord(Dbpages.java:109) 09-29 23:56:25.706: E/AndroidRuntime(23196): at com.yellowpages.Details.onCreate(Details.java:22) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.Activity.performCreate(Activity.java:4465) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 09-29 23:56:25.706: E/AndroidRuntime(23196): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 09-29 23:56:25.706: E/AndroidRuntime(23196): ... 11 more package com.yellowpages; import android.annotation.SuppressLint; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.NavUtils; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.EditText; import android.widget.RadioButton; import android.widget.Toast; public class UserSearch extends Activity { public static String category="",pin=""; @SuppressLint("NewApi") @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_user_search); getActionBar().setDisplayHomeAsUpEnabled(true); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_user_search, menu); return true; } public void search(View v) { switch(v.getId()) { case R.id.button1: EditText et1= (EditText)findViewById(R.id.editText1); RadioButton r1 = (RadioButton) findViewById(R.id.radio0); RadioButton r2 = (RadioButton) findViewById(R.id.radio1); RadioButton r3 = (RadioButton) findViewById(R.id.radio2); RadioButton r4 = (RadioButton) findViewById(R.id.radio3); RadioButton r5 = (RadioButton) findViewById(R.id.radio4); RadioButton r6 = (RadioButton) findViewById(R.id.radio5); pin=et1.getText().toString(); if(pin.length()==0){ Toast.makeText(this, "Please provide Input!", Toast.LENGTH_SHORT).show(); return; } if(r1.isChecked()) { category="All"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r2.isChecked()) { category="Food"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r3.isChecked()) { category="Entertainment"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r4.isChecked()) { category="Shopping"; Intent i=new Intent(this,Details.class); startActivity(i); } else if(r5.isChecked()) { category="Health"; Intent i=new Intent(this,Details.class); startActivity(i); } else if (r6.isChecked()) { category="Services"; Intent i=new Intent(this,Details.class); startActivity(i); } break; } /*if(pin.length()!=0&amp;&amp;category.length()!=0) { Intent i=new Intent(this,Details.class); startActivity(i); }*/ } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: NavUtils.navigateUpFromSameTask(this); return true; } return super.onOptionsItemSelected(item); } } </code></pre>
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    1. COwhat is category? You should show the line of the NullPointerException ( at com.yellowpages.Dbpages.fetchRecord(Dbpages.java:109) ). Probably category is not passed properly. You should pass parameters to a newly created activity via an intent.
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    2. COAre you getting Force close when you are clicking on radio button, is it??
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      1. USvishesh chandra
    3. COsee this question to properly pass a string from one activity to another: http://stackoverflow.com/questions/6707900/how-to-pass-string-one-activity-to-another
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