Question

I created a table view and display some text there with help of experts in android.

Now i wish to push a new view when user click on each cell of a table view.

I created a new class within the same package named Newview.java.

The labels are displaying correctly in three different rows.

But when i click the first cell the program is crashing.

Can you please help me where im going wrong.

HelloTableLayoutActivity.java

  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.TextView;

  public class HelloTableLayoutActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        TextView name =  (TextView)findViewById(R.id.label);
        name.setOnClickListener(new View.OnClickListener(){

        public void onClick(View v) {
        Intent nameActivity =new Intent();
        nameActivity .setClass(getApplicationContext(), Newview.class);
        startActivity(nameActivity);

        }
      });
    }
}

Main.xml

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1">    
    <TextView
        android:id="@+id/label"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <TableRow>
        <TextView
            android:layout_column="1"
            android:text="@string/name"
            android:padding="3dip" />
        <TextView
            android:text="@string/initial"
            android:gravity="right"
            android:padding="3dip" />
    </TableRow>

    <TableRow>
        <TextView
            android:layout_column="1"
            android:text="@string/hometown"
            android:padding="3dip" />
        <TextView
            android:text="@string/state"
            android:gravity="right"
            android:padding="3dip" />
    </TableRow>   

</TableLayout>

Can anyone please help me how can i push a new view when click on the cell of table view in android.Thanks in advance.Hope for your help.

Answer 1

Declare your activity in the manifest like below:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sweans.tb"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" 
         >
        <activity
            android:label="@string/app_name"
            android:name=".HelloTableLayoutActivity">
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity 
            android:name=".Newview"
            android:label="@string/app_name"
            >
        </activity>

    </application>

</manifest>

To add your further activities to the manifest, add them in your <application> tag as shown above with the Newview. So, that’s as far as your manifest goes. When it comes to code, there are a few things that you need to take care of.

Firstly, whenever you want to display a new screen to the user, make it a point to convert the class into an Activity. You can do it as follows:

public class Newview extends Activity
{
 /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.foo);
    }
}

foo refers to an XML file name. This foo.xml which will be in your res/layout/ will contain another layout to display to your user. So, when you’re switching screens/activities, make sure you’ve your foo.xml filled with atleast a TextView so that you don’t get confused as to whether your app is working or not.

One last thing. When you extend your class with Activity, make sure you import all related packages such as import android.app.Activity; for Activity and import android.os.Bundle; for public void onCreate(Bundle savedInstanceState). These are just examples.

Hope this helps.