基于activity 全局悬浮球代码实现

以下是一个基于 Activity 实现全局悬浮球的代码示例：

public class FloatingActivity extends Activity implements View.OnTouchListener {

    private WindowManager mWindowManager;
    private WindowManager.LayoutParams mLayoutParams;
    private ImageView mFloatingView;
    private int mStartX, mStartY;
    private int mLastX, mLastY;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_floating);

        // 设置窗口属性
        mLayoutParams = new WindowManager.LayoutParams();
        mLayoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        mLayoutParams.format = PixelFormat.RGBA_8888;
        mLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        mLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
        mLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
        mLayoutParams.gravity = Gravity.TOP | Gravity.START;

        // 添加悬浮球 View
        mFloatingView = new ImageView(this);
        mFloatingView.setImageResource(R.drawable.ic_floating_ball);
        mFloatingView.setOnTouchListener(this);
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mWindowManager.addView(mFloatingView, mLayoutParams);
    }

    @Override
    public boolean onTouch(View view, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                // 记录起始位置
                mStartX = mLayoutParams.x;
                mStartY = mLayoutParams.y;
                // 记录上一次位置
                mLastX = (int) event.getRawX();
                mLastY = (int) event.getRawY();
                break;
            case MotionEvent.ACTION_MOVE:
                // 计算移动距离
                int dx = (int) (event.getRawX() - mLastX);
                int dy = (int) (event.getRawY() - mLastY);
                // 更新悬浮球位置
                mLayoutParams.x = mStartX + dx;
                mLayoutParams.y = mStartY + dy;
                mWindowManager.updateViewLayout(mFloatingView, mLayoutParams);
                break;
            case MotionEvent.ACTION_UP:
                // 处理悬浮球点击事件
                if (Math.abs(event.getRawX() - mLastX) < 10 && Math.abs(event.getRawY() - mLastY) < 10) {
                    Intent intent = new Intent(this, FloatingBallClickActivity.class);
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    startActivity(intent);
                    // 关闭悬浮球窗口
                    mWindowManager.removeView(mFloatingView);
                    finish();
                }
                break;
        }
        return true;
    }

}

在上面的代码中，我们创建了一个继承自 Activity 的类 FloatingActivity，作为悬浮球的容器。在 onCreate 方法中，我们设置了容器的布局、位置等属性，并添加了一个 ImageView 作为悬浮球 View。在 onTouch 方法中，我们实现了悬浮球的拖动和点击事件，并使用 WindowManager 来更新悬浮球的位置。在悬浮球点击事件中，我们启动了一个新的 Activity 处理点击事件，并关闭了悬浮球窗口。