Activity & Context

to import Activity or Context as following.

How to do:
1. public class MyExample extends Activity.

<activity android:name=".SystemUpApp"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

* MyExample is main entrance of this application


2. public class MySample

public class MySample{
Activity activity;
Context context;

public MySample(Activity a,Context c) {
activity = a;
context = c;

3. How to new MySample instance.

MySample sample = new MySample(this,this);

4. How to use activity or context.

TextView tv = new TextView(activity);

That's all!