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Add API demo for game style system UI interaction.

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Shows the ideal way for a game to interact with system UI, hiding
the status bar and nav bar while being played, making them visible
when paused or otherwise interacting with controls of the game,
and determing layout of game controls to not be covered by the
status bar or nav bar.

Change-Id: Ia192c31321113d81f96c06c7a69a06ef72c4682a
This commit is contained in:
Dianne Hackborn
2013-12-02 16:30:50 -08:00
parent 3519ce6eb3
commit 18159037a4
4 changed files with 292 additions and 12 deletions
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57
samples/ApiDemos/src/com/example/android/apis/graphics/TouchPaint.java
View File

@@ -26,6 +26,7 @@ import android.graphics.RectF;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
@@ -87,9 +88,6 @@ public class TouchPaint extends GraphicsActivity {
/** Is fading mode enabled? */
boolean mFading;
/** The index of the current color to use. */
int mColorIndex;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
@@ -104,10 +102,10 @@ public class TouchPaint extends GraphicsActivity {
// the contents of the bitmap.
if (savedInstanceState != null) {
mFading = savedInstanceState.getBoolean("fading", true);
mColorIndex = savedInstanceState.getInt("color", 0);
mView.mColorIndex = savedInstanceState.getInt("color", 0);
} else {
mFading = true;
mColorIndex = 0;
mView.mColorIndex = 0;
}
}
@@ -161,7 +159,7 @@ public class TouchPaint extends GraphicsActivity {
// Save away the fading state to restore if needed later. Note that
// we do not currently save the contents of the display.
outState.putBoolean("fading", mFading);
outState.putInt("color", mColorIndex);
outState.putInt("color", mView.mColorIndex);
}
@Override
@@ -225,9 +223,9 @@ public class TouchPaint extends GraphicsActivity {
*
* It handles all of the input events and drawing functions.
*/
class PaintView extends View {
public static class PaintView extends View {
private static final int FADE_ALPHA = 0x06;
private static final int MAX_FADE_STEPS = 256 / FADE_ALPHA + 4;
private static final int MAX_FADE_STEPS = 256 / (FADE_ALPHA/2) + 4;
private static final int TRACKBALL_SCALE = 10;
private static final int SPLAT_VECTORS = 40;
@@ -235,21 +233,31 @@ public class TouchPaint extends GraphicsActivity {
private final Random mRandom = new Random();
private Bitmap mBitmap;
private Canvas mCanvas;
private final Paint mPaint;
private final Paint mFadePaint;
private final Paint mPaint = new Paint();
private final Paint mFadePaint = new Paint();
private float mCurX;
private float mCurY;
private int mOldButtonState;
private int mFadeSteps = MAX_FADE_STEPS;
/** The index of the current color to use. */
int mColorIndex;
public PaintView(Context c) {
super(c);
init();
}
public PaintView(Context c, AttributeSet attrs) {
super(c, attrs);
init();
}
private void init() {
setFocusable(true);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mFadePaint = new Paint();
mFadePaint.setColor(BACKGROUND_COLOR);
mFadePaint.setAlpha(FADE_ALPHA);
}
@@ -273,6 +281,31 @@ public class TouchPaint extends GraphicsActivity {
}
}
public void text(String text) {
if (mBitmap != null) {
final int width = mBitmap.getWidth();
final int height = mBitmap.getHeight();
mPaint.setColor(COLORS[mColorIndex]);
mPaint.setAlpha(255);
int size = height;
mPaint.setTextSize(size);
Rect bounds = new Rect();
mPaint.getTextBounds(text, 0, text.length(), bounds);
int twidth = bounds.width();
twidth += (twidth/4);
if (twidth > width) {
size = (size*width)/twidth;
mPaint.setTextSize(size);
mPaint.getTextBounds(text, 0, text.length(), bounds);
}
Paint.FontMetrics fm = mPaint.getFontMetrics();
mCanvas.drawText(text, (width-bounds.width())/2,
((height-size)/2) - fm.ascent, mPaint);
mFadeSteps = 0;
invalidate();
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
int curW = mBitmap != null ? mBitmap.getWidth() : 0;