Android实现悬浮图片

本文实例为大家分享了Android实现悬浮图片的具体代码，供大家参考，具体内容如下

@SuppressLint("AppCompatCustomView")public class MoveImageView extends ImageView { //按下那一刻的坐标和 控件上下左右距离 private float lastX; private float lastY; private int left; private int top; private int right; private int bottom; //如果是拖动事件就不用响应点击事件 boolean isMove = false; boolean isAnimatoring = false; //屏幕宽高 private int screenWidthPx; private int screenHeightPx; public MoveImageView(Context context) {  this(context, null); } public MoveImageView(Context context, @Nullable AttributeSet attrs) {  this(context, attrs, 0); } public MoveImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {  super(context, attrs, defStyleAttr);  screenWidthPx = getScreenWidthPx(getContext());  screenHeightPx = getScreenHeightPx(getContext()); } @Override public boolean onTouchEvent(MotionEvent event) {  switch (event.getAction()) {   case MotionEvent.ACTION_DOWN:    //动画执行过程中，不响应一切操作，    // 这里相当于不让其走后面的MotionEvent.ACTION_MOVE:与MotionEvent.ACTION_UP:    if (isAnimatoring) {     return false;    }    lastX = event.getRawX();    lastY = event.getRawY();    left = getLeft();    top = getTop();    right = getRight();    bottom = getBottom();    break;   case MotionEvent.ACTION_MOVE:    isMove = true;    float x = event.getRawX();    float y = event.getRawY();    int l = (int) (left + (x - lastX));    int t = (int) (top + (y - lastY));    int r = (int) (right + (x - lastX));    int b = (int) (bottom + (y - lastY));    layout(l, t, r, b);    break;   case MotionEvent.ACTION_UP:    if (isMove) {     //如果顶部拖出屏幕外面，回正     if (getTop() < 0) {      layout(getLeft(), 0, getRight(), getHeight());     }     //getBottom() 获取到的是 控件底部到父容器顶部的距离，所以需要减去状态栏的高度     int bottomHeight = screenHeightPx - getStatusBarHeight(getContext());     //如果底部拖出屏幕外面，回正     if (getBottom() > bottomHeight) {      layout(getLeft(), bottomHeight-getHeight(), getRight(), bottomHeight);     }     isMove = false;     startAnimation();     return true;    }    return super.onTouchEvent(event);  }  return super.onTouchEvent(event); } private void startAnimation() {  isAnimatoring = true;  //右边距  int marinRight = DisplayUtils.dpToPx(20);  int endValue = screenWidthPx - marinRight;  ValueAnimator animator = ValueAnimator.ofInt(getRight(), endValue);  animator.setDuration(Math.abs(endValue - getRight()) > 1000 ? 1000 : Math.abs(endValue - getRight()));  animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {   @Override   public void onAnimationUpdate(ValueAnimator animation) {    int curValue = (int) animation.getAnimatedValue();    layout(curValue - getWidth(), getTop(), curValue, getHeight() + getTop());   }  });  animator.addListener(new AnimatorListenerAdapter() {   @Override   public void onAnimationStart(Animator animation) {   }   @Override   public void onAnimationEnd(Animator animation) {    isAnimatoring = false;    animator.removeAllUpdateListeners();    animator.removeAllListeners();   }  });  animator.start(); } /**  * 获取状态栏高度  */ public static int getStatusBarHeight(Context context) {  int result = 24;  int resId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");  if (resId > 0) {   result = context.getResources().getDimensionPixelSize(resId);  } else {   result = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,     result, Resources.getSystem().getDisplayMetrics());  }  return result; } public static int getScreenWidthPx(Context context) {  WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);  DisplayMetrics dm = new DisplayMetrics();  if (windowManager != null) {//   windowManager.getDefaultDisplay().getMetrics(dm);   windowManager.getDefaultDisplay().getRealMetrics(dm);   return dm.widthPixels;  }  return 0; } public static int getScreenHeightPx(Context context) {  WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);  DisplayMetrics dm = new DisplayMetrics();  if (windowManager != null) {//   windowManager.getDefaultDisplay().getMetrics(dm);   windowManager.getDefaultDisplay().getRealMetrics(dm);   return dm.heightPixels;  }  return 0; }}

应用：

布局文件:

<?xml version="1.0" encoding="utf-8"?>

Activity:

public class TestActivity extends AppCompatActivity { private MoveImageView moveImageView; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_test2);  moveImageView = ((MoveImageView) findViewById(R.id.MoveImageView));  moveImageView.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    Toast.makeText(TestActivity.this, "点击事件", Toast.LENGTH_SHORT).show();   }  }); }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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