File I/O activity and Sound activity

Author: tacksoo

AndroidManifest.xml

@@ -34,10 +34,14 @@
             android:name="com.example.helloworld.PreferenceActivity"
             android:label="Preference Activity" >
         </activity>
-            <activity
+        <activity
             android:name="com.example.helloworld.TextFileActivity"
             android:label="TextFile Activity" >
         </activity>
+        <activity
+            android:name="com.example.helloworld.AudioActivity"
+            android:label="Audio Activity" >
+        </activity>
     </application>
 
 </manifest>

res/layout/activity_audio.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <Button
+        android:id="@+id/buttonAudio1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Button" />
+
+    <Button
+        android:id="@+id/buttonAudio2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Button" />
+
+    <Button
+        android:id="@+id/buttonAudio3"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Button" />
+
+</LinearLayout>

res/layout/activity_main.xml

@@ -43,7 +43,7 @@
                 android:id="@+id/button5"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:text="Button" />
+                android:text="Audio" />
 
             <Button
                 android:id="@+id/button6"

res/layout/activity_textfile.xml

@@ -5,7 +5,7 @@
     android:orientation="vertical" >
 
     <EditText
-        android:id="@+id/editText1"
+        android:id="@+id/editText_FileExample"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_weight="0.14"
@@ -16,7 +16,7 @@
     </EditText>
 
     <Button
-        android:id="@+id/button1"
+        android:id="@+id/button_FileExample"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"

res/raw/champion.wav

@@ -0,0 +1,41 @@
+package com.example.helloworld;
+
+import android.app.Activity;
+import android.media.AudioManager;
+import android.media.MediaPlayer;
+import android.os.Bundle;
+import android.view.View;
+import android.view.View.OnClickListener;
+
+public class AudioActivity extends Activity implements OnClickListener {
+
+	private MediaPlayer mp;
+
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.activity_audio);
+		setVolumeControlStream(AudioManager.STREAM_MUSIC);
+		findViewById(R.id.buttonAudio1).setOnClickListener(this);
+		findViewById(R.id.buttonAudio2).setOnClickListener(this);
+		findViewById(R.id.buttonAudio3).setOnClickListener(this);
+	}
+
+	@Override
+	public void onClick(View v) {
+		int id;
+		if (v.getId() == R.id.buttonAudio1) {
+			id = R.raw.champion;
+		} else if (v.getId() == R.id.buttonAudio2) {
+			id = R.raw.eum;
+		} else  { //if (v.getId() == R.id.buttonAudio3) {
+			id = R.raw.mburger;
+		}
+		if(mp != null) {
+			mp.release();
+		}
+		mp = MediaPlayer.create(this,id);
+		mp.start();
+	}
+
+}

res/raw/eum.wav

@@ -13,6 +13,7 @@ public class MainActivity extends Activity {
 	private Button button1;
 	private Button button2;
 	private Button button3;
+	private Button button5;
 	private Context context;
 
 	@Override
@@ -26,6 +27,8 @@ protected void onCreate(Bundle savedInstanceState) {
 		button2.setOnClickListener(new MyOnClickListener());
 		button3 = (Button) findViewById(R.id.button3);
 		button3.setOnClickListener(new MyOnClickListener());
+		button5 = (Button) findViewById(R.id.button5);
+		button5.setOnClickListener(new MyOnClickListener());
 	}
 
 	@Override
@@ -45,6 +48,8 @@ public void onClick(View arg0) {
 				startActivity(new Intent(context, PreferenceActivity.class));
 			} else if (arg0.getId() == R.id.button3) {
 				startActivity(new Intent(context, TextFileActivity.class));
+			} else if (arg0.getId() == R.id.button5) {
+				startActivity(new Intent(context, AudioActivity.class));
 			}
 		}
 	}

res/raw/mburger.wav

@@ -4,35 +4,70 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.util.Scanner;
 
 import android.app.Activity;
+import android.content.Context;
 import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
 import android.widget.EditText;
 
 public class TextFileActivity extends Activity {
 
 	private EditText editor;
+	private Button button;
+	private Context context;
 
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_textfile);
-		editor = (EditText) findViewById(R.id.editText1);
+		editor = (EditText) findViewById(R.id.editText_FileExample);
+		button = (Button) findViewById(R.id.button_FileExample);
+		button.setOnClickListener(new WriteToFileListener());
 
 		try {
 			// insert text file in the assets folder
-			InputStream in = this.getAssets().open("readme.txt");
+			// you can't write to the assests folder, it is read-only
+			//InputStream in = this.getAssets().open("readme.txt");
+			
+			// but you can write to the local filesystem
+			InputStream in = openFileInput("readme.txt");
 			BufferedReader reader = new BufferedReader(
 					new InputStreamReader(in));
 			String str;
 			while ((str = reader.readLine()) != null) {
 				editor.append(str + "\n");
 			}
-
 			in.close();
+			
+			/*
+			 * another idiom for doing the same thing
+			Scanner scanner = new Scanner(openFileInput("readme.txt"));
+			while(scanner.hasNextLine()) {
+				editor.append(scanner.nextLine());
+			}
+			scanner.close();
+			*/
 		} catch (IOException e) {
 			e.printStackTrace();
 		}
+	}
 
+	public class WriteToFileListener implements View.OnClickListener {
+		@Override
+		public void onClick(View v) {
+			try {
+				OutputStream out = openFileOutput("readme.txt", MODE_APPEND);
+				OutputStreamWriter writer = new OutputStreamWriter(out);
+				writer.write(editor.getText().toString());
+				writer.close();
+			} catch (Exception e) {
+
+			}
+		}
 	}
 }