How to use Google Play services

Ready to use Google Play services

If you need to use Google Play services API, you should do download of Google Play services on Android SDK Manager.Google Play services was saved in following directory.<AndroidSDK>\sdk\extras\google\google_play_services\libproject\google-play-services_lib

Importing this Android Project to eclipse.

You must write a meta-data in AndroidMaifest.xml using Google Play services API.

    <application
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
    </application>

Check to exist of Google Play services

You shoud Check to exist of Google Play services in a device.

public class UsingGooglePlayServiceSampleActivity extends FragmentActivity {

    private boolean isGooglePlayServicesAvailable() {
        int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

        if (ConnectionResult.SUCCESS == resultCode) {
            return true;
        } else {
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(resultCode, this,
                    CONNECTION_FAILURE_RESOLUTION_REQUEST);
            if (dialog != null) {
                ErrorDialogFragment errorFragment = new ErrorDialogFragment();
                errorFragment.setDialog(dialog);
                errorFragment.show(getSupportFragmentManager(), "errro_dialog");
            }
        }

        return false;
    }

    public static class ErrorDialogFragment extends DialogFragment {

        private Dialog mDialog;

        public ErrorDialogFragment() {
            super();
            mDialog = null;
        }

        public void setDialog(Dialog dialog) {
            mDialog = dialog;
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return mDialog;
        }

        @Override
        public void onDestroy() {
            mDialog = null;
            super.onDestroy();
        }
    }
}

Calling a method of GooglePlayServicesUtil.isGooglePlayServicesAvailable(), you can get Result code.If Result code is error, you can get a Dialog Object from calling method GooglePlayServicesUtil.getErrorDialog().You must use a DialogFragment to show a dialog.

If User close a dialog, onActivityResult is called with Result Code.

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CONNECTION_FAILURE_RESOLUTION_REQUEST) {
            if (resultCode == Activity.RESULT_OK) {
                // retry process
            }
        }
    }

About a permission "WRITE_EXTERNAL_STORAGE"

http://developer.android.com/reference/android/Manifest.permission.html#WRITE_EXTERNAL_STORAGE

Starting in API level 19, this permission is not required to read/write files in your application-specific directories returned by getExternalFilesDir(String) and getExternalCacheDir()

If appliction is waking up on Android 4.4 Device, WRITE_EXTERNAL_STORAGE is not required to call getExternalFilesDir(String) and getExternalCacheDir(). Not returned Null.

Add "disable swipe" to ViewPager.

I want to stop swipe in ViewPager. But ViewPager does not have "disable swipe" API.

Creat a custom ViewPager

I creat a custom ViewPager. Custom ViewPager has a "disable swipe" API.

package jp.baroqueworksdev.myapidemo.view;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

public class MyViewPager extends ViewPager {
    private boolean mIsEnabledSwipe = true;

    public MyViewPager(Context context) {
        super(context);
    }

    public MyViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (!mIsEnabledSwipe) {
            return false;
        }
        return super.onTouchEvent(event);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        if (!mIsEnabledSwipe) {
            return false;
        }
        return super.onInterceptTouchEvent(event);
    }

    public void setEnabledSwipe(boolean enabled) {
        mIsEnabledSwipe = enabled;
    }

}

How to use a Sensor of "TYPE_STEP_DETECTOR"

A sensor of this type triggers an event each time a step is taken by the user.

http://developer.android.com/reference/android/hardware/Sensor.html#TYPE_STEP_DETECTOR

Initialize Sensor

We have to get a Sensor's Object from SensorManager.
Set the type "Sensor.TYPE_STEP_DETECTOR".

public class StepCounterActivity extends Activity {
    private SensorManager mSensorManager;
    private Sensor mStepSensor;
    private TextView mTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = (TextView) findViewById(R.id.text_step);

        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mStepSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);

    }

    protected void onResume() {
        super.onResume();
        mSensorManager.registerListener(mSensorEventListener, mStepSensor,
                SensorManager.SENSOR_DELAY_NORMAL);
    }

    protected void onPause() {
        super.onPause();
        mSensorManager.unregisterListener(mSensorEventListener);
    }

Create a SensorListener

We can get a trigger from onSensorChanged.

    private SensorEventListener mSensorEventListener = new SensorEventListener() {
        private int mStep;

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }

        @Override
        public void onSensorChanged(SensorEvent event) {
            if (event.values[0] == 1.0f) {
                mStep++;
            }
            mTextView.setText(Integer.toString(mStep));
        }
    };

How to use a Sensor of "TYPE_STEP_COUNTER"

Android API 19 add Sensor of "TYPE_STEP_COUNTER".

http://developer.android.com/reference/android/hardware/Sensor.html#TYPE_STEP_COUNTER

Initialize Sensor

We have to get a Sensor's Object from SensorManager.
Set the type "Sensor.TYPE_STEP_COUNTER".

public class StepCounterActivity extends Activity {
    private SensorManager mSensorManager;
    private Sensor mStepSensor;
    private TextView mTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = (TextView) findViewById(R.id.text_step);

        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mStepSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);

    }

    protected void onResume() {
        super.onResume();
        mSensorManager.registerListener(mSensorEventListener, mStepSensor,
                SensorManager.SENSOR_DELAY_NORMAL);
    }

    protected void onPause() {
        super.onPause();
        mSensorManager.unregisterListener(mSensorEventListener);
    }

Create a SensorListener

We can get a step from onSensorChanged.
"event.values[0]" is a step counter.A sensor of this type returns the number of steps taken by the user since the last reboot while activated. The value is returned as a float (with the fractional part set to zero) and is reset to zero only on a system reboot.

    private SensorEventListener mSensorEventListener = new SensorEventListener() {
        private float mStepOffset;

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }

        @Override
        public void onSensorChanged(SensorEvent event) {
            if (mStepOffset == 0) {
                mStepOffset = event.values[0];
            }
            mTextView.setText(Float.toString(event.values[0] - mStepOffset));
        }
    };

How to use the DrawerLayout like a slide menu of the "Google Play"

Android Developers Site

http://developer.android.com/training/implementing-navigation/nav-drawer.html

Creat a layout file

You shoud create a layout file using DrawerLayout in android.support.v4.widget.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <!-- The main content view -->

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- The navigation drawer -->

    <ListView
        android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#111"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp" />

</android.support.v4.widget.DrawerLayout>

Set in Activity

We set ActionBarDrawerToggle.
We call "setHomeButtonEnabled(true)" and "setDisplayHomeAsUpEnabled(true)", in order to enable the click of an icon on ActionBar.

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

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

        mTitle = getTitle();
        mDrawerTitle = getText(R.string.drawer_open);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerToggle = new ActionBarDrawerToggle(
                this, /* host Activity */
                mDrawerLayout, /* DrawerLayout object */
                R.drawable.ic_drawer, /* nav drawer icon to replace 'Up' caret */
                R.string.drawer_open, /* "open drawer" description */
                R.string.drawer_close /* "close drawer" description */
                ) {

                    /**
                     * Called when a drawer has settled in a completely closed
                     * state.
                     */
                    public void onDrawerClosed(View view) {
                        getActionBar().setTitle(mTitle);
                    }

                    /**
                     * Called when a drawer has settled in a completely open
                     * state.
                     */
                    public void onDrawerOpened(View drawerView) {
                        getActionBar().setTitle(mDrawerTitle);
                    }
                };

        // Set the drawer toggle as the DrawerListener
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);
    }

Add OpenGL with hardware rendering on JellybeanOnBeaglebone_WithSGX for Beagle Bone Black

If you would like to use OpenGL ES 2.0 with hardware rendering, you should add modification.

Mod egl.cfg

\device\ti\beagleboard\egl.cfg

0 0 android
0 1 POWERVR_SGX530_125 <- add line !!

Mod build.prop

\device\ti\beagleboard\beagleboard.mk

PRODUCT_PROPERTY_OVERRIDES := \
net.dns1=8.8.8.8 \
net.dns2=8.8.4.4 \
ro.opengles.version=131072 <- add line !!