【发布时间】：2019-09-10 09:36:21
【问题描述】：
我有一个完全基于 Java（无 XML）的代码的自定义视图，我想在新的基于 XML 的布局中添加它。请指导如何执行此操作，但我也希望它在显示时屏幕将显示 50% 的 xml 布局和 50% 的 customview 是否有可能？请看下图更清楚
下面是动画的Java代码：
public class AccelerometerPlayActivity extends Activity {
private SimulationView mSimulationView;
private SensorManager mSensorManager;
private PowerManager mPowerManager;
private WindowManager mWindowManager;
private Display mDisplay;
private WakeLock mWakeLock;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get an instance of the SensorManager
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
// Get an instance of the PowerManager
mPowerManager = (PowerManager) getSystemService(POWER_SERVICE);
// Get an instance of the WindowManager
mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
mDisplay = mWindowManager.getDefaultDisplay();
// Create a bright wake lock
mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, getClass()
.getName());
// instantiate our simulation view and set it as the activity's content
mSimulationView = new SimulationView(this);
mSimulationView.setBackgroundResource(R.drawable.wood);
setContentView(mSimulationView);
}
@Override
protected void onResume() {
super.onResume();
/*
* when the activity is resumed, we acquire a wake-lock so that the
* screen stays on, since the user will likely not be fiddling with the
* screen or buttons.
*/
mWakeLock.acquire();
// Start the simulation
mSimulationView.startSimulation();
mSimulationView.setLayoutParams(new FrameLayout.LayoutParams(700, 300));
}
@Override
protected void onPause() {
super.onPause();
/*
* When the activity is paused, we make sure to stop the simulation,
* release our sensor resources and wake locks
*/
// Stop the simulation
mSimulationView.stopSimulation();
// and release our wake-lock
mWakeLock.release();
}
class SimulationView extends LinearLayout implements SensorEventListener {
// diameter of the balls in meters
private static final float sBallDiameter = 0.004f;
private static final float sBallDiameter2 = sBallDiameter * sBallDiameter;
private final int mDstWidth;
private final int mDstHeight;
private Sensor mAccelerometer;
private long mLastT;
private float mXDpi;
private float mYDpi;
private float mMetersToPixelsX;
private float mMetersToPixelsY;
private float mXOrigin;
private float mYOrigin;
private float mSensorX;
private float mSensorY;
private float mHorizontalBound;
private float mVerticalBound;
private final ParticleSystem mParticleSystem;
/*
* Each of our particle holds its previous and current position, its
* acceleration. for added realism each particle has its own friction
* coefficient.
*/
class Particle extends View {
private float mPosX = (float) Math.random();
private float mPosY = (float) Math.random();
private float mVelX;
private float mVelY;
public Particle(Context context) {
super(context);
}
public Particle(Context context, AttributeSet attrs) {
super(context, attrs);
}
public Particle(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public Particle(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
public void computePhysics(float sx, float sy, float dT) {
final float ax = -sx/5;
final float ay = -sy/5;
mPosX += mVelX * dT + ax * dT * dT / 2;
mPosY += mVelY * dT + ay * dT * dT / 2;
mVelX += ax * dT;
mVelY += ay * dT;
}
/*
* Resolving constraints and collisions with the Verlet integrator
* can be very simple, we simply need to move a colliding or
* constrained particle in such way that the constraint is
* satisfied.
*/
public void resolveCollisionWithBounds() {
final float xmax = mHorizontalBound;
final float ymax = mVerticalBound;
final float x = mPosX;
final float y = mPosY;
if (x > xmax) {
mPosX = xmax;
mVelX = 0;
} else if (x < -xmax) {
mPosX = -xmax;
mVelX = 0;
}
if (y > ymax) {
mPosY = ymax;
mVelY = 0;
} else if (y < -ymax) {
mPosY = -ymax;
mVelY = 0;
}
}
}
/*
* A particle system is just a collection of particles
*/
class ParticleSystem {
static final int NUM_PARTICLES = 5;
private Particle mBalls[] = new Particle[NUM_PARTICLES];
ParticleSystem() {
/*
* Initially our particles have no speed or acceleration
*/
for (int i = 0; i < mBalls.length; i++) {
mBalls[i] = new Particle(getContext());
mBalls[i].setBackgroundResource(R.drawable.ball);
mBalls[i].setLayerType(LAYER_TYPE_HARDWARE, null);
addView(mBalls[i], new ViewGroup.LayoutParams(mDstWidth, mDstHeight));
}
}
/*
* Update the position of each particle in the system using the
* Verlet integrator.
*/
private void updatePositions(float sx, float sy, long timestamp) {
final long t = timestamp;
if (mLastT != 0) {
final float dT = (float) (t - mLastT) / 1000.f /** (1.0f / 1000000000.0f)*/;
final int count = mBalls.length;
for (int i = 0; i < count; i++) {
Particle ball = mBalls[i];
ball.computePhysics(sx, sy, dT);
}
}
mLastT = t;
}
/*
* Performs one iteration of the simulation. First updating the
* position of all the particles and resolving the constraints and
* collisions.
*/
public void update(float sx, float sy, long now) {
// update the system's positions
updatePositions(sx, sy, now);
// We do no more than a limited number of iterations
final int NUM_MAX_ITERATIONS = 1;
/*
* Resolve collisions, each particle is tested against every
* other particle for collision. If a collision is detected the
* particle is moved away using a virtual spring of infinite
* stiffness.
*/
boolean more = true;
final int count = mBalls.length;
for (int k = 0; k < NUM_MAX_ITERATIONS && more; k++) {
more = false;
for (int i = 0; i < count; i++) {
Particle curr = mBalls[i];
for (int j = i + 1; j < count; j++) {
Particle ball = mBalls[j];
float dx = ball.mPosX - curr.mPosX;
float dy = ball.mPosY - curr.mPosY;
float dd = dx * dx + dy * dy;
// Check for collisions
if (dd <= sBallDiameter2) {
/*
* add a little bit of entropy, after nothing is
* perfect in the universe.
*/
dx += ((float) Math.random() - 0.5f) * 0.0001f;
dy += ((float) Math.random() - 0.5f) * 0.0001f;
dd = dx * dx + dy * dy;
// simulate the spring
final float d = (float) Math.sqrt(dd);
final float c = (0.5f * (sBallDiameter - d)) / d;
final float effectX = dx * c;
final float effectY = dy * c;
curr.mPosX -= effectX;
curr.mPosY -= effectY;
ball.mPosX += effectX;
ball.mPosY += effectY;
more = true;
}
}
curr.resolveCollisionWithBounds();
}
}
}
public int getParticleCount() {
return mBalls.length;
}
public float getPosX(int i) {
return mBalls[i].mPosX;
}
public float getPosY(int i) {
return mBalls[i].mPosY;
}
}
public void startSimulation() {
/*
* It is not necessary to get accelerometer events at a very high
* rate, by using a slower rate (SENSOR_DELAY_UI), we get an
* automatic low-pass filter, which "extracts" the gravity component
* of the acceleration. As an added benefit, we use less power and
* CPU resources.
*/
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_GAME);
}
public void stopSimulation() {
mSensorManager.unregisterListener(this);
}
public SimulationView(Context context) {
super(context);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
mXDpi = metrics.xdpi;
mYDpi = metrics.ydpi;
mMetersToPixelsX = mXDpi / 0.0254f;
mMetersToPixelsY = mYDpi / 0.0254f;
// rescale the ball so it's about 0.5 cm on screen
mDstWidth = (int) (sBallDiameter * mMetersToPixelsX + 0.5f);
mDstHeight = (int) (sBallDiameter * mMetersToPixelsY + 0.5f);
mParticleSystem = new ParticleSystem();
Options opts = new Options();
opts.inDither = true;
opts.inPreferredConfig = Bitmap.Config.RGB_565;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
// compute the origin of the screen relative to the origin of
// the bitmap
mXOrigin = (w - mDstWidth) * 0.5f; //@nyy this is changing the rect of balls to simulate
mYOrigin = (h - mDstHeight) * 0.5f;
mHorizontalBound = ((w / mMetersToPixelsX - sBallDiameter) * 0.5f);//@nyy this is changing the rect of balls to simulate
mVerticalBound = ((h / mMetersToPixelsY - sBallDiameter) * 0.5f);
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER)
return;
/*
* record the accelerometer data, the event's timestamp as well as
* the current time. The latter is needed so we can calculate the
* "present" time during rendering. In this application, we need to
* take into account how the screen is rotated with respect to the
* sensors (which always return data in a coordinate space aligned
* to with the screen in its native orientation).
*/
switch (mDisplay.getRotation()) {
case Surface.ROTATION_0:
mSensorX = event.values[0];
mSensorY = event.values[1];
break;
case Surface.ROTATION_90:
mSensorX = -event.values[1];
mSensorY = event.values[0];
break;
case Surface.ROTATION_180:
mSensorX = -event.values[0];
mSensorY = -event.values[1];
break;
case Surface.ROTATION_270:
mSensorX = event.values[1];
mSensorY = -event.values[0];
break;
}
}
@Override
protected void onDraw(Canvas canvas) {
/*
* Compute the new position of our object, based on accelerometer
* data and present time.
*/
final ParticleSystem particleSystem = mParticleSystem;
final long now = System.currentTimeMillis();
final float sx = mSensorX;
final float sy = mSensorY;
particleSystem.update(sx, sy, now);
final float xc = mXOrigin;
final float yc = mYOrigin;
final float xs = mMetersToPixelsX;
final float ys = mMetersToPixelsY;
final int count = particleSystem.getParticleCount();
for (int i = 0; i < count; i++) {
/*
* We transform the canvas so that the coordinate system matches
* the sensors coordinate system with the origin in the center
* of the screen and the unit is the meter.
*/
final float x = xc + particleSystem.getPosX(i) * xs;
final float y = yc - particleSystem.getPosY(i) * ys;
particleSystem.mBalls[i].setTranslationX(x);
particleSystem.mBalls[i].setTranslationY(y);
}
// and make sure to redraw asap
invalidate();
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
}
【问题讨论】：
-
我找到了这个但问题还没有解决：stackoverflow.com/questions/53106904/…
-
如果我理解正确，请告诉我。您想要一个绘制背景和粒子列表的自定义视图，并且想要将此自定义视图添加到线性布局中？
-
是的@Mihai 没错我的自定义视图完全基于 Java（不是 XML），它创建的粒子很少，我想在基于 XML 的布局中添加它...
标签： java android android-custom-view