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POfirst android application gives error
 

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    <p>I am new developer in Android and unfortunately my first app is giving an error. I am developing a simple temperature converter.</p> <p>These are the files.</p> <p>AndroidManifest.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.tempconv" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name="com.example.tempconv.MainActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>activity_main.xml:</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" &gt; &lt;EditText android:id="@+id/ipdata" android:hint="Enter temperature" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="22dp" android:ems="10" /&gt; &lt;TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/ipdata" android:layout_below="@+id/ipdata" android:layout_marginTop="15dp" android:text="Select Conversion" /&gt; &lt;RadioButton android:id="@+id/ctof" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginLeft="25dp" android:layout_marginTop="18dp" android:text="Celsius to Feherenhit" /&gt; &lt;RadioButton android:id="@+id/ftoc" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/ctof" android:layout_below="@+id/ctof" android:text="Feherenhit to Celsius" /&gt; &lt;EditText android:id="@+id/opdata" android:hint="Hit below button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/ftoc" android:layout_marginTop="54dp" android:ems="10" /&gt; &lt;Button android:id="@+id/doconvert" android:onClick="docon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/opdata" android:layout_centerHorizontal="true" android:layout_marginTop="20dp" android:text="convert" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>MainActivity.java:</p> <pre><code>package com.example.tempconv; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.EditText; import android.widget.RadioButton; public class MainActivity extends Activity { RadioButton RD1 = (RadioButton) findViewById(R.id.ctof); RadioButton RD2 = (RadioButton) findViewById(R.id.ftoc); EditText input = (EditText) findViewById(R.id.ipdata); EditText output = (EditText) findViewById(R.id.opdata); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public void doconvert(View v) { float data = Float.parseFloat(input.toString()); if (RD1.isChecked()){ float c; c = (data-32)*(5/9); output.setText(String.valueOf(c)); } else if (RD2.isChecked()){ float f; f=(data*(9/5))+32; output.setText(String.valueOf(f)); } } } </code></pre> <p>I checked lots of thread here but dint get solution yet.</p>
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    1. COwhat is the error post your logcat trace
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    2. COFirst of all, what is the error?! where is the Logcat output
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    3. COand where is your error? :)
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