CS 491 Lecture 4 – DroidPopper
Agenda
- Droid Popper
- views and activities
- configuration-sensitive resources
- multitouch
- media player
Code
PopperView.java
package org.twodee.droidpopper;
import java.util.Random;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class PopperView extends View {
private Bitmap[] images;
private boolean[][] isPopped;
public PopperView(Context context,
AttributeSet attrs) {
super(context, attrs);
images = new Bitmap[2];
images[0] = BitmapFactory.decodeResource(context.getResources(), R.drawable.unpopped);
images[1] = BitmapFactory.decodeResource(context.getResources(), R.drawable.popped);
}
@Override
protected void onSizeChanged(int w,
int h,
int oldw,
int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
int nRows = (int) Math.ceil(h / (double) images[0].getHeight());
int nCols = (int) Math.ceil(w / (double) images[0].getWidth());
isPopped = new boolean[nRows][nCols];
}
@Override
public void onDraw(Canvas canvas) {
for (int r = 0; r < isPopped.length; ++r) {
for (int c = 0; c < isPopped[r].length; ++c) {
Bitmap image = images[isPopped[r][c] ? 1 : 0];
canvas.drawBitmap(image, c * image.getWidth(), r * image.getHeight(), null);
}
}
}
private void popAt(float x, float y) {
int c = (int) x / images[0].getWidth();
int r = (int) y / images[0].getHeight();
if (!isPopped[r][c]) {
isPopped[r][c] = true;
final MediaPlayer player = MediaPlayer.create(getContext(), getRandomAudioID());
player.start();
player.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
player.release();
}
});
invalidate();
}
}
private int getRandomAudioID() {
int[] ids = {R.raw.pop1, R.raw.pop2, R.raw.pop3};
return ids[new Random().nextInt(ids.length)];
}
@Override
public boolean onTouchEvent(MotionEvent event) {
for (int i = 0; i < event.getPointerCount(); ++i) {
float x = event.getX(i);
float y = event.getY(i);
popAt(x, y);
}
return true;
}
}
MainActivity.java
package org.twodee.droidpopper;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<org.twodee.droidpopper.PopperView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/popperView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
AndroidManifest.xml
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="org.twodee.droidpopper"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name="org.twodee.droidpopper.MainActivity"
android:label="Droid Popper">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Haiku
The first way seems right
Then you see a second way
And wish for a third
Then you see a second way
And wish for a third