ActivityOne

package course.labs.activitylab;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class ActivityOne extends Activity {

    private static final String RESTART_KEY = "restart";
    private static final String RESUME_KEY = "resume";
    private static final String START_KEY = "start";
    private static final String CREATE_KEY = "create";

    // String for LogCat documentation
    private final static String TAG = "Lab-ActivityOne";


    // Lifecycle counters
    // TODO:
    // Create counter variables for onCreate(), onRestart(), onStart() and
    // onResume(), called mCreate, etc.
    protected int mCreate=0;
    protected int mRestart=0;
    protected int mStart=0;
    protected int mResume=0;
    // You will need to increment these variables' values when their
    // corresponding lifecycle methods get called



    // TODO: Create variables for each of the TextViews, called
        // mTvCreate, etc.
    protected TextView mTvCreate;
    protected TextView mTvRestart;
    protected TextView mTvStart;
    protected TextView mTvResume;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_one);

        // TODO: Assign the appropriate TextViews to the TextView variables
        // Hint: Access the TextView by calling Activity's findViewById()
         mTvCreate  = (TextView) findViewById(R.id.create);
         mTvRestart = (TextView) findViewById(R.id.restart);
         mTvStart = (TextView) findViewById(R.id.start);
         mTvResume = (TextView) findViewById(R.id.resume);
        Button launchActivityTwoButton = (Button) findViewById(R.id.bLaunchActivityTwo);
        launchActivityTwoButton.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO:
                    // Launch Activity Two
                    // Hint: use Context's startActivity() method
                    // Create an intent stating which Activity you would like to start
                      Intent myIntent = new Intent(ActivityOne.this,ActivityTwo.class);
                    // Launch the Activity using the intent
                    startActivity(myIntent);
                }
            });

            // Check for previously saved state
            if (savedInstanceState != null) {

                // TODO:
                // Restore value of counters from saved state
                // Only need 4 lines of code, one for every count variable
                mCreate = savedInstanceState.getInt(CREATE_KEY);
                mStart = savedInstanceState.getInt(START_KEY);
                mResume = savedInstanceState.getInt(RESUME_KEY);
                mRestart = savedInstanceState.getInt(RESTART_KEY);

            }

            // TODO: Emit LogCat message
            Log.i(TAG,CREATE_KEY);

            // TODO:
            // Update the appropriate count variable
            // Update the user interface via the displayCounts() method

            mCreate++;
            displayCounts();


        }

    // Lifecycle callback methods overrides

    @Override
    public void onStart() {
        super.onStart();

        // TODO: Emit LogCat message
        Log.i(TAG, START_KEY);

        // TODO:
        // Update the appropriate count variable
        // Update the user interface
        mStart++;
        displayCounts();


    }

    @Override
    public void onResume() {
        super.onResume();

        // TODO: Emit LogCat message
        Log.i(TAG, RESUME_KEY);

        // TODO:
        // Update the appropriate count variable
        // Update the user interface
        mResume++;
        displayCounts();


    }

    @Override
    public void onPause() {
        super.onPause();

        // TODO: Emit LogCat message
        Log.i(TAG,"PAUSED");


    }

    @Override
    public void onStop() {
        super.onStop();

        // TODO: Emit LogCat message
        Log.i(TAG,"STOPPED");


    }

    @Override
    public void onRestart() {
        super.onRestart();

        // TODO: Emit LogCat message
        Log.i(TAG,RESTART_KEY);

        // TODO:
        // Update the appropriate count variable
        // Update the user interface
        mRestart++;
        displayCounts();


    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        // TODO: Emit LogCat message
        Log.i(TAG,"DESTROYED");
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {

        // TODO:
        // Save counter state information with a collection of key-value pairs
        // 4 lines of code, one for every count variable
        savedInstanceState.putInt(CREATE_KEY, mCreate);
        savedInstanceState.putInt(START_KEY, mStart);
        savedInstanceState.putInt(RESUME_KEY, mResume);
        savedInstanceState.putInt(RESTART_KEY, mRestart);
        Log.i(TAG, "Saved current state");

    }

    // Updates the displayed counters
    public void displayCounts() {

        mTvCreate.setText("onCreate() calls: " + mCreate);
        mTvStart.setText("onStart() calls: " + mStart);
        mTvResume.setText("onResume() calls: " + mResume);
        mTvRestart.setText("onRestart() calls: " + mRestart);

    }
}