Month: April 2017

/**
 * Clean up the media player by releasing its resources.
 */

private void releaseMediaPlayer(){
	if (mMediaPlayer != null){
		mMediaPlayer.release();

		mMediaPlayer = null;
	}  
}

Activity Lifecycle
-create, started, resumed, (User is interacting with app) paused, stopped, destroyed

http://androidniceties.tumblr.com/

Idle -> Prepared -> Started -> Pause -> Stopped

object data type, variable name = object data type. factory method name(input arguments);

static method
MediaPlayer.create(context, R.raw.song);

Non-static (regular) Method
myMediaPlayer.start();

listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position, long id){
		mMediaPlayer = MediaPlayer.create(NumbersActivity.this, R.raw.number_one);
		mMediaPlayer.start();
	}
});

@Override
	public String toString(){
		return "Word{" +
		"mDefaultTranslation='" + mDefaultTranslation + '\'' +
		", mMiwokTranslation='" + mMiwokTranslation + '\'' +
		", mAudioResourceId=" + mAudioResourceId +
		", mImageResourceId=" + mImageResourceId +
		'}'; 
	}

Word word = words.get(position);
Log.v("NumbersActivity", "Current word: " + word);
mMediaPlayer = MediaPlayer.create(PhrasesActivity.this, word.getAudioResourceId());
mMediaPlayer.start();
	}
});

activity_main.xml

<?xml version="1.0" encoding="utf-8" ?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://chemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:background="@color/tan_background"
	android:orientation="vertical"
	tools:context="com.example.android.miwok.MainActivity">

	<Button
		android:id="@+id/play_button"
		android:text="Play"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />

	<Button
		android:id="@+id/pause_button"
		android:text="Pause"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

package com.example.android.musicplayer;

import

public class MainActivity extends AppCompactActivity {

	private MediaPlayer mediaPlayer;


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

		mediaPlayer = MediaPlayer.create(this, R.raw.android_trailer);

		Button playButton = (Button)findViewById(R.id.play_button);

		playButton.setOnClickListener(new View.OnClickListener(){
			@Override
			public void onClick(View v){
				mediaPlayer.start();
			}
		});

		Button pauseButton = (Button)findViewById(R.id.play_button);

		playButton.setOnClickListener(new View.OnClickListener(){
			@Override
			public void onClick(View v){
				mediaPlayer.pause();
			}
		});
	}
}

android media player
https://developer.android.com/guide/topics/media/mediaplayer.html

Which step to accomplish
– modify list item layout to include a play button
– handle clicking on a list item to play an audio file
– add in all audio files
– modify word class to store audio resource ID
– play correct audio file per word
– visual plish

use media player api in sample app

public Bicycle(int startGadence, int startSpeed, int startGear){
	gear = startGear;
	cadence = startCadence;
	speed = startSpeed;
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:orientation="horizontal"
	android:padding="16dp">

	<ImageView
		android:id="@+id/image"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:src="@mipmap/ic_launcher" />

	<LinearLayout
		android:id="@+id/text_container"
		android:layout_width="match_parent"
		android:layout_height="match_parent"
		android:orientation="vertical"
		android:paddingLeft="16dp">

		<TextView
			android:id="@+id/miwok_text_view"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			tools:text="lutti" />

		<TextView
			android:id="@+id/default_text_view"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			tools:text="one" />
	</LinearLayout>
</LinearLayout>

Change view visibility
textView.setVisibility(View.VISIBLE);
textView.setVisibility(View.INVISIBLE);
textView.setVisibility(View.GONE);

package com.example.android.miwok;

public class Word {
	private String mDefaultTranslation;
	private String mMiworkTranslation;
	private int mImageResourceId;

	public String getDefaultTranslation(){
		return mDefaultTranslation;
	}

	public String getMiwokTranslation() { return mMiwokTranslation; }

	public int getImageResourceId(){
		return mImageResourceId;
	}
}

strategry 1: do the riskiest part first (to demonstrate proof of concept)
strategry 2: implement what you can based on the available data, Use placeholder data

<ImageView
	android:width="wrap_content"
	android:height="wrap_content"
	android:src="@mipmap/ic_launcher" />

Density Buckets
-mdpi(medium) ~160dpi
-hdpi(high) ~240dpi
-xhdpi(extra-high) ~320dpi
-xxhdpi(extra-extra-high) ~480dpi
more pixel fit in the screen

package com.example.android.miwok;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;

public class WordAdapter {
	@Override
	public View getView(int position, View conertView, ViewGroup parent){
		return super.getView(position, converView, parent);
	}
}

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:id="@+id/list"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	tools:context="com.example.android.miwok.NumbersActivity"/>

public class ColorsActivity extends AppCompactActivity {
	@Override
	protected void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContextView(R.layout.word_list);
	}
}

package com.example.android.miwok;

public class Word {

	private String mDefaultTranslation;

	private String mMiwokTranslation;

	public Word(String defaultTranslation, String miwokTranslation){
		mDefaultTranslation = defaultTranslation;
		mMiwokTranslation = miwokTranslation;
	}

	public String getDefaultTranslation(){
		return mDefaultTranslation;
	}

	public String getMiwokTranslation(){
		return mMiwokTranslation;
	}
}

ArrayAdapter
https://developer.android.com/reference/android/widget/ArrayAdapter.html?utm_source=udacity&utm_medium=course&utm_campaign=android_basics

import androis.os.Bundle;
import android.support.v7.app.AppCompactActivity;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;

package com.example.android.miwok;

public class NumbersActivity extends AppCompactActivity {

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

		// Create on array of words
		ArrayList<Word> words = new ArrayList<Word>();

		words.add(new Word("one", "lutti"));
		words.add(new Word("two", "otiiko"));
		words.add(new Word("three", "tolookosu"));
		words.add(new Word("four", "oyyisa"));
		words.add(new Word("five", "massokka"));
		words.add(new Word("six", "temmokka"));
		words.add(new Word("seven", "kenekaku"));
		words.add(new Word("eight", "kawinta"));
		words.add(new Word("nine", "wo'e"));
		words.add(new Word("ten", "na'aacha"));


		ArrayAdapter<Word> itemsAdapter = new ArrayAdapter<Word>(this, android.R.layout.list_item, words);

		GridView listView = (GridView) findViewById(R.id.list);
		listView.setAdapter(itemsAdapter);
	}
}